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Cape Peninsula University of Technology
1.
Giraneza, Martial.
High voltage direct current (HVDC) in applications for distributed independent power providers (IPP)
.
Degree: 2013, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1077 
► The development of power electronics did remove most of technical limitations that high voltage direct current (HVDC) used to have. HVDC, now, is mostly used…
(more)
▼ The development of power electronics did remove most of technical limitations that high voltage direct current (HVDC) used to have. HVDC, now, is mostly used for the transmission of bulk power over long distances and for the interconnection of asynchronous grid. Along with the development of the HVDC, the growth of power demand also increased beyond the utilities capacities. Besides the on-going increasing of power demand, the reforms in electricity market have led to the liberalization and the incorporation of Independent power providers in power system operation. Regulations and rules have been established by regulating authority for grid integration of Independent power providers. With the expected increase of penetration level of those new independent power providers, result of economic reason and actual green energy trend, best method of integration of those new power plants are required.
In this research HVDC technology, namely VSC-HVDC is used as interface for connecting independent power providers units to the grid. VSC-HVDC has various advantages such as short-circuit contribution and independent control of active and reactive power. VSC-HVDC advantages are used for a safe integration of IPPs and make them participate to grid stabilization. MATLAB/Simulink simulations of different grid connected, through VSC-HVDC system, IPPs technologies models are performed.
For each IPP technology model, system model performances are studied and dynamics responses during the disturbance are analyzed in MATLAB/ Simulink program. The simulation results show that the model satisfy the standard imposed by the regulating authority in terms of power quality and grid support. Also the results show the effect of the VSC-HVDC in preventing faults propagation from grid to integrated IPPs units.
Subjects/Keywords: Electric power distribution;
High-tension electric transmission;
Direct-current transmission;
High voltages;
High voltage direct current (HVDC);
Voltage source converter (VSC);
VSC-HVDC;
Independent power providers (IPP);
Dissertations, Academic;
MTech
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APA (6th Edition):
Giraneza, M. (2013). High voltage direct current (HVDC) in applications for distributed independent power providers (IPP)
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1077
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Giraneza, Martial. “High voltage direct current (HVDC) in applications for distributed independent power providers (IPP)
.” 2013. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1077.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Giraneza, Martial. “High voltage direct current (HVDC) in applications for distributed independent power providers (IPP)
.” 2013. Web. 02 Mar 2021.
Vancouver:
Giraneza M. High voltage direct current (HVDC) in applications for distributed independent power providers (IPP)
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2013. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1077.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Giraneza M. High voltage direct current (HVDC) in applications for distributed independent power providers (IPP)
. [Thesis]. Cape Peninsula University of Technology; 2013. Available from: http://etd.cput.ac.za/handle/20.500.11838/1077
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
2.
Smith, Robert Albert.
A performance study of a voltage-fed reluctance synchronous machine
.
Degree: 2013, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1078
► The reluctance synchronous machine (RSM) operates on the principle of magnetic reluctance, which is produced through a careful selection of rotor flux barriers and cut-outs.…
(more)
▼ The reluctance synchronous machine (RSM) operates on the principle of magnetic reluctance, which is produced through a careful selection of rotor flux barriers and cut-outs. Magnetic reluctivity is the resistance to magnetic flux and can be directly related to the principles of Ohm’s law in electrical circuits. Although reluctance motors have been known for more than 150 years, researchers lost interest when Nikola Tesla’s induction machine (IM) was introduced to industry. Over the last few decades, however, RSMs have shown a lot of potential. They are cheap, robust, reliable, and their rotors can also be used in the stators of IMs. The disadvantage of these machines is an inherently high torque ripple, being the result of its rotor geometry, but the biggest advantage is having a significant reduction in copper losses after the rotor cage has been removed. This advantage drove engineers to investigate, optimise and modify the performance and structure of this machine, which led to the usage of electronic drive systems. The recent advances in technology have allowed researchers to further investigate and modify the design and performance of this special type of machine, with the integration of Finite Element Analysis (FEA) software also making a contribution to the development of the RSM’s current driven systems. The voltage-fed RSM, driven direct-on-line (DOL) from the utility supply, was left in the shadows as the current-fed RSM took reign, but still is, in the author’s opinion, not yet fully analysed. This thesis practically investigates the performance characteristics of the cageless, voltage-fed 3kW RSM in its steady-state operation, under various loads. These performance characteristics are also compared to a RSM driven from a sensorless vector drive (current-fed) to investigate the advantages and disadvantages between the two.
Experiments performed on the test bench immediately reveal a limitation to the voltage-fed RSM’s ability to drive higher loads. While the current-fed RSM conveniently reaches 150% of its full-load, the voltage-fed RSM, due to its cageless
structure, only reaches 110% of its full-load power. Despite this discovery, the voltage-fed RSM proves to have a lower core loss, harmonic content and torque ripple. Using a FE software package with an integrated source-code, additional parameters such as the dq-axis inductances and currents are also compared and analysed in terms of its reaction to an increase in load. The eddy-current, hysteresis and excess losses are also analysed as well as the harmonic components caused by the geometry of the RSM. For academic purposes, a fair amount of emphasis is placed on the approach to the problem. The preparation for the FE simulation is explained in detail, providing insight into the FE mathematical model as well as parameter acquisition. These parameters include current angle, friction and windage losses, stator resistance, end-winding leakage reactance, core loss and inertia. The results obtained by the FE model are compared to that of the measured…
Subjects/Keywords: Synchronous machinery;
Electric motors, synchronous;
Alternating-current machinery;
Reluctance motors;
Finite element analysis (FEA);
Direct-on-line (DOL);
MTech;
Theses, dissertations, etc.;
NavTech;
Cape Peninsula University of Technology. Department of Electrical Engineering
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APA (6th Edition):
Smith, R. A. (2013). A performance study of a voltage-fed reluctance synchronous machine
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1078
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Smith, Robert Albert. “A performance study of a voltage-fed reluctance synchronous machine
.” 2013. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1078.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Smith, Robert Albert. “A performance study of a voltage-fed reluctance synchronous machine
.” 2013. Web. 02 Mar 2021.
Vancouver:
Smith RA. A performance study of a voltage-fed reluctance synchronous machine
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2013. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1078.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Smith RA. A performance study of a voltage-fed reluctance synchronous machine
. [Thesis]. Cape Peninsula University of Technology; 2013. Available from: http://etd.cput.ac.za/handle/20.500.11838/1078
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
3.
Bevan, Graeme Rhys.
A practical investigation into the measurement of forces on the stator teeth of electrical machines
.
Degree: 2013, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1079
► Radial and peripheral displacement of stator teeth in electrical machines is known to be the cause of undesired vibration which leads to noise. This thesis…
(more)
▼ Radial and peripheral displacement of stator teeth in electrical machines is known to be
the cause of undesired vibration which leads to noise. This thesis serves to investigate the
possibility of physically measuring the radial displacement of stator teeth caused by
electromagnetic forces which, to the author’s knowledge, has not yet been achieved. A
simplified practical approach is adopted in order to address the inherent difficulties
attached to this problem, and the measurement of displacement is done by means of an
experimental rig where a tooth is subjected to magnetic force acting over an air gap.
Three experiments are carried out, each comprising ten tests, the results of which are
compared in order to gain some idea as to the magnitudes of displacement which can be
expected over a range of applied air gap flux densities. The aim of this work is to observe
the displacement response of magnetised EM core material when acted upon by forces,
and to see if the measured results agree with the elastic displacement predicted by a wellknown
formula. It will be shown that although the measured results are in the same range
as the predicted results, there is a deviation from the predicted linearity due to certain
characteristics of the force rig, which are explained.
The chosen measurement method is capacitive displacement and is shown to be a viable
alternative to the more commonly used search coils and vibrometers in past literatures,
especially when measuring displacements on the nano-scale. In addition, this study shows
the importance of using 3D finite element software to simulate the electromagnetic model
when saturation is present in the core of the test specimen. The important findings of this
work are discussed in detail, and some ideas put forward, in an attempt to establish a
starting point for future related work in the measurement of electromagnetic forceinduced
displacement of stator teeth in electrical machines.
Subjects/Keywords: Electric machines;
Electrical machines;
Electromagnetic compatibility;
Electromagnetic theory;
Stator teeth;
Electromagnetic model;
3D finite element software;
Dissertations, Academic;
MTech;
Theses, dissertations, etc.;
NavTech;
Cape Peninsula University of Technology. Department of Electrical Engineering
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Manager
APA (6th Edition):
Bevan, G. R. (2013). A practical investigation into the measurement of forces on the stator teeth of electrical machines
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1079
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bevan, Graeme Rhys. “A practical investigation into the measurement of forces on the stator teeth of electrical machines
.” 2013. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1079.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bevan, Graeme Rhys. “A practical investigation into the measurement of forces on the stator teeth of electrical machines
.” 2013. Web. 02 Mar 2021.
Vancouver:
Bevan GR. A practical investigation into the measurement of forces on the stator teeth of electrical machines
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2013. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1079.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bevan GR. A practical investigation into the measurement of forces on the stator teeth of electrical machines
. [Thesis]. Cape Peninsula University of Technology; 2013. Available from: http://etd.cput.ac.za/handle/20.500.11838/1079
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
4.
Pentz, Rory Adriaan.
Development of a multi-cell inverter topology for driving nonlinear piezoelectric load
.
Degree: 2014, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1080
► This report presents the design and development of a five cell multicell inverter for driving a piezoelectric load. The multicell inverter was chosen for this…
(more)
▼ This report presents the design and development of a five cell multicell inverter for driving a piezoelectric load. The multicell inverter was chosen for this application as it became evident that it would be more suitable for driving piezoelectric transducers due to its high apparent switching frequency. The multicell inverter was designed using DirectFET’s as this type of FET has a high current switching ability in a very small package. A positive and negative bootstrap power supply was incorporated in the design to reduce the number of supplies to power the gate drive circuits of the multicell inverter.
Three compensation networks were designed and constructed to investigate which one would transfer the most energy to the piezoelectric transducer. It was also important to investigate whether these compensation networks were able to reduce the harmonic content produced by the multicell inverter. This is necessary in order to excite the transducer correctly. It was found that the Q-Matching compensation network reduced the harmonic content applied to the load the most. Experiments were also conducted to determine if the advantage of the apparent frequency of the multicell inverter would mean that the piezoelectric load could be driven directly with the multicell inverter without any damage to the transducer. It was however required to increase the applied apparent power to the transducer to compensate for the reactive component of the load in order to melt the plastic which was used as the load to the transducer.
Experiments were conducted to determine if the charge on the cell capacitors of the multicell inverter would stay balanced while driving a non linear load such as a piezoelectric transducer. The results showed that the voltages stayed balanced when driving the piezoelectric transducer.
Subjects/Keywords: Electric inverters;
Piezoelectric transducers;
Topology;
Dissertations, Academic;
MTech;
Theses, dissertations, etc.;
Cape Peninsula University of Technology. Department of Electrical Engineering
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APA ·
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Manager
APA (6th Edition):
Pentz, R. A. (2014). Development of a multi-cell inverter topology for driving nonlinear piezoelectric load
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1080
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Pentz, Rory Adriaan. “Development of a multi-cell inverter topology for driving nonlinear piezoelectric load
.” 2014. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1080.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Pentz, Rory Adriaan. “Development of a multi-cell inverter topology for driving nonlinear piezoelectric load
.” 2014. Web. 02 Mar 2021.
Vancouver:
Pentz RA. Development of a multi-cell inverter topology for driving nonlinear piezoelectric load
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2014. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1080.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Pentz RA. Development of a multi-cell inverter topology for driving nonlinear piezoelectric load
. [Thesis]. Cape Peninsula University of Technology; 2014. Available from: http://etd.cput.ac.za/handle/20.500.11838/1080
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
5.
Cupido, Stephen William John.
Augmentation of a nano-satellite electronic power system using a field-programmable-gate-array.
Degree: 2013, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1084
► The CubeSat standard has various engineering challenges due to its small size and surface area. The challenge is to incorporate a large amount of technology…
(more)
▼ The CubeSat standard has various engineering challenges due to its small size and surface area. The challenge is to incorporate a large amount of technology into a form factor no bigger than 10cm3. This research project investigates the space environment, solar cells, secondary sources of power, and Field-Programmable-Gate-Array (FPGA) technology in order to address the size, weight and power challenges presented by the CubeSat standard. As FPGAs have not yet been utilised in this particular sub-system as the main controller, this research investigates whether or not the implementation of an FPGA-based electronic power supply sub-system will optimise its functionality by overcoming these size weight and power challenges.
The SmartFusion FPGA was chosen due to its analogue front end which can reduce the number of peripheral components required by such complex systems. Various maximum power point tracking algorithms were studied and it was determined that the perturb-and-observe maximum power point tracking algorithm best suits the design constraints, as it only requires the measurement of either solar cell voltage or solar cell current, thus further decreasing the component count. The SmartFusion FPGA analogue compute engine allows for increased performance of the perturb-and-observe algorithm implemented on the microcontroller sub-system as it allows for the offloading of many repetitive calculations. A VHDL implementation of the pulse-width-modulator was developed in order to produce the various changes in duty cycle produced by the perturb-and-observe algorithm.
The aim of this research project was achieved through the development and testing of a nano-satellite power system prototype using the SmartFusion FPGA from Microsemi with a decreased number of peripheral circuits. Maximum power point was achieved in 347ms at worst case with a 55% decrease in power consumption from the estimated 330mW as indicated in the power budget. The SmartFusion FPGA consumes only a worst case of 148.93mW. It was found that the unique features of the SmartFusion FPGA do in fact address the size weight and power constraints of the CubeSat standard within this sub-system.
Subjects/Keywords: Nanosatellites;
Electric power systems;
Field programmable gate arrays;
Dissertations, Academic;
MTech;
Theses, dissertations, etc.
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APA ·
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APA (6th Edition):
Cupido, S. W. J. (2013). Augmentation of a nano-satellite electronic power system using a field-programmable-gate-array.
(Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1084
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Cupido, Stephen William John. “Augmentation of a nano-satellite electronic power system using a field-programmable-gate-array.
” 2013. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1084.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Cupido, Stephen William John. “Augmentation of a nano-satellite electronic power system using a field-programmable-gate-array.
” 2013. Web. 02 Mar 2021.
Vancouver:
Cupido SWJ. Augmentation of a nano-satellite electronic power system using a field-programmable-gate-array.
[Internet] [Thesis]. Cape Peninsula University of Technology; 2013. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1084.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Cupido SWJ. Augmentation of a nano-satellite electronic power system using a field-programmable-gate-array.
[Thesis]. Cape Peninsula University of Technology; 2013. Available from: http://etd.cput.ac.za/handle/20.500.11838/1084
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
6.
Nzeugaing, Gutembert Nganpet.
Image compression system for a 3u cubesat
.
Degree: 2013, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1085
► Earth observation satellites utilise sensors or cameras to capture data or images that are relayed to the ground station(s). The ZACUBE-02 CubeSat currently in development…
(more)
▼ Earth observation satellites utilise sensors or cameras to capture data or images that are relayed to the ground station(s). The ZACUBE-02 CubeSat currently in development at the French South African Institute of Technology (F’SATI) contains a high resolution 5 megapixel on-board camera. The purpose of the camera is to capture images of Earth and relay them to the ground station once communication is established. The captured images, which can amount to a large volume of data, have to be stored on-board as the CubeSat awaits the next cycle of transmission to the ground station. This mode of operation introduces a number of problems, as the CubeSat has limited storage and memory capacity and is not able to store large amounts of data. This, together with the limitation of the downlink capacity, has set the need for the design and development of an image compression system suitable for the CubeSat environment.
Image compression focuses on reducing the size of images to be stored as well as reducing the size of the images to be transmitted to the ground station. The purpose of the study is to propose a compression system to be implemented on ZACUBE-02. An intensive study of current, proposed and implemented compression methods, algorithms and techniques as well as the CubeSat specification, served as input for defining the requirements for such a system.
The proposed design is a combination of image segmentation, image linearization and image entropy coding (run-length coding). This combination technique is implemented in order to achieve lossless image compression. For the proposed design, a compression ratio of 10:1 was obtained without negatively affecting image quality.The on-board storage memory constraints, the power constraints and the bandwidth constraints are met with the implementation of the proposed design, resulting in the downlink transmission time being minimised.
Within the study a number of objectives were met in order to design, implement and test the compression system. These included a detailed study of image compression techniques; a look into techniques for improving the compression ratio; and a study of industrial hardware components suitable for the space environment.
Keywords: CubeSat, hardware, compression, satellite image compression, Gumstix Overo Water, ZACUBE-02.
Subjects/Keywords: CubeSat power systems;
Image compression;
Data compression (Telecommunication);
Satellites;
Dissertations, Academic;
ZACUBE-02;
Gumstix overo water;
MTech;
Theses, dissertations, etc.
Record Details
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Record Details
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Nzeugaing, G. N. (2013). Image compression system for a 3u cubesat
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1085
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Nzeugaing, Gutembert Nganpet. “Image compression system for a 3u cubesat
.” 2013. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1085.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Nzeugaing, Gutembert Nganpet. “Image compression system for a 3u cubesat
.” 2013. Web. 02 Mar 2021.
Vancouver:
Nzeugaing GN. Image compression system for a 3u cubesat
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2013. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1085.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Nzeugaing GN. Image compression system for a 3u cubesat
. [Thesis]. Cape Peninsula University of Technology; 2013. Available from: http://etd.cput.ac.za/handle/20.500.11838/1085
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
7.
Meru, Alan Henry Micheni.
Design and development of medium voltage open rack harmonic filters for distribution networks
.
Degree: 2013, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1087
► Harmonic voltages and currents in distribution networks are on the increase in recent times due to the introduction of a proliferation of electronic controlled devices…
(more)
▼ Harmonic voltages and currents in distribution networks are on the increase in recent times
due to the introduction of a proliferation of electronic controlled devices such as variable
speed drives. These non-linear devices improve efficiency but distort the supply waveforms.
To address the harmonic issues, harmonic filters are used to mitigate distortion levels and
prevent damage. These harmonic filters are commonly found at medium voltage levels in
power systems. The problem is that knowledge from the design to commissioning stages of
these medium voltage harmonic filters are neither well developed nor adequately
documented. The aim of this research is to investigate and expound upon the process whilst
taking into account all the factors involved throughout the process from bringing such a filter
into operation in the real world.
Medium voltage harmonic filters are usually the open rack type found in outdoor installations.
Capacitors and reactors are the main components used in the construction of such harmonic
filters and in some instances resistors are also used. The physical size and spacing of such
components determines the construction layout area and how this is done in practice
warrants being researched and explained in this thesis.
In order to make these factors explicit, a methodology is developed from design, to
installation and commissioning and is applied to two networks which are used to prove that
the developed methodology is applicable for the different types of harmonic filters designed.
The network voltage levels are also different, thus implying that the components will have
different design factors. The final arrangements of the harmonic filters are later drawn and
shown in three-dimension (3D) as per dimensions. The 3D figures are a further contribution
as the design is taken from theory and is ultimately implemented into an installation and
construction layout for erection at site.
Interviews and surveys are conducted with specialists in industry dealing with harmonic filter
applications and the results are analysed as part of implementation of the developed
methodology.
The design, installation and construction phases are documented and shown to be effective
in application and the work disclosed in this thesis will help newcomers to this specialised
field and is recommended for use in industry.
Subjects/Keywords: Harmonics (Electric waves);
Electric power distribution;
Dissertations, Academic;
MTech
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APA ·
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MLA ·
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CSE |
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Manager
APA (6th Edition):
Meru, A. H. M. (2013). Design and development of medium voltage open rack harmonic filters for distribution networks
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1087
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Meru, Alan Henry Micheni. “Design and development of medium voltage open rack harmonic filters for distribution networks
.” 2013. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1087.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Meru, Alan Henry Micheni. “Design and development of medium voltage open rack harmonic filters for distribution networks
.” 2013. Web. 02 Mar 2021.
Vancouver:
Meru AHM. Design and development of medium voltage open rack harmonic filters for distribution networks
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2013. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1087.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Meru AHM. Design and development of medium voltage open rack harmonic filters for distribution networks
. [Thesis]. Cape Peninsula University of Technology; 2013. Available from: http://etd.cput.ac.za/handle/20.500.11838/1087
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
8.
Nteka, Makhetsi Flora.
Development and assessment of reduced order power system models
.
Degree: 2013, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1088
► The demand for electrical energy has kept on increasing, thus causing power systems to be more complex and bringing the challenging problems of electrical energy…
(more)
▼ The demand for electrical energy has kept on increasing, thus causing power systems to be more complex and bringing the challenging problems of electrical energy generation, transmission, stability, as well as storage to be examined more thoroughly.
With the advent of high-speed computation and the desire to analyze increasingly complex behaviour in power systems, simulation techniques are gaining importance and prevalence. Nevertheless, while simulations of large, interconnected complex power systems are feasible, they remain time-consuming. Moreover, the models and parameters used in simulations are uncertain, due to measurement uncertainty, the need to represent a complex behaviour with low-order models, and the inherent changing nature of the power system.
This research explores the use of a model reduction technique and the applications of a Real-Time Digital Simulator (RTDS) to reduce the uncertainty in large-scale complex power system models. The main goal of the research is to develop a reduced order model and to investigate the applications of the RTDS simulator in reduction of large, interconnected power systems models. The first stage of the study is to build and simulate the full model of the power system using the DigSILENT and RTDS simulators. The second phase is to apply model reduction technique to the full model and to determine the parameters in the reduced-order model as well as how the process of reduction increases this model uncertainty. In the third phase the results of the model reduction technique are compared based on the results of the original model - IEEE standard benchmark models has been used. The RTDS was used for comparative purposes.
The thesis investigations use a particular model reduction technique as Coherency based Method. Though the method ideas are applicable more generally, a concrete demonstration of its principles is instructive and necessary. Further, while this particular technique is not relevant to every system, it does apply to a broad class of systems and illustrates the salient features of the proposed methodology.
The results of the thesis can be used in the development of reduced models of complex power systems, simulation in real-time during power system operation, education at universities, and research.
Keywords: IEEE benchmark models, reduced models, Coherency based Method, DigSILENT, RTDS, model uncertainty, power system stability
Subjects/Keywords: Electric power system stability;
Electric pow systems;
Real time digital stimulator;
Electric power transmission;
Dissertations, Academic;
MTech;
Theses, dissertations, etc.
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APA (6th Edition):
Nteka, M. F. (2013). Development and assessment of reduced order power system models
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1088
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Nteka, Makhetsi Flora. “Development and assessment of reduced order power system models
.” 2013. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1088.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Nteka, Makhetsi Flora. “Development and assessment of reduced order power system models
.” 2013. Web. 02 Mar 2021.
Vancouver:
Nteka MF. Development and assessment of reduced order power system models
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2013. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1088.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Nteka MF. Development and assessment of reduced order power system models
. [Thesis]. Cape Peninsula University of Technology; 2013. Available from: http://etd.cput.ac.za/handle/20.500.11838/1088
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
9.
Raji, Atanda Kamoru.
Modelling and development of fuel cell off grid power converter system
.
Degree: 2008, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1090
► Fuel cell technology is an emerging technology that provides a highly efficient, quiet operation, reliable, and environmentally friendly energy conversion system for stationary, automobile (vehicle),…
(more)
▼ Fuel cell technology is an emerging technology that provides a highly efficient, quiet
operation, reliable, and environmentally friendly energy conversion system for stationary,
automobile (vehicle), and portable applications. An electrochemical process combines
hydrogen fuel and oxygen from air to produce water, and in the process it produces
electricity and heat. Fuel cell stationary applications which include residential, office
buildings, hospitals, hotels, airports and others have received greater attention for their
ability to utilize the heat generated for space and water heating. This combined heat and
power (CHP) process increases the energy conversion efficiency greatly which in turn
save cost of energy usage.
Different power converter topologies for fuel cell systems residential applications are
presented in this thesis for efficiency, cost, component count, input ripple current
minimization technique, reliability for comparison analysis. The commercial feasibility of
fuel cells rests on the cost of the fuel cell system and operating efficiency and fuel cost.
The proposed power converter topology consists of two front end DC-DC converters.
The first front-end DC-Dc converter is tightly controlled while the second is a full bridge
four interleaved DC-DC converters. Advantages of the proposed topology are reduced
input ripple current, high efficiency, low maintenance cost, smaller size, modularity,
redundancy. Design overview as well as simulation results are presented.
Fuel cell simulation test results, including transient response are displayed and
analyzed. The concept of interleaving of multiple units of the De-De converter is
proposed. Interleaving enables paralleling multiple units of the converters to achieve a
high combined power. This results in using semiconductor power devices of lower
current rating, lowering sizes of input and output capacitors and reducing the output
ripples. Simulations results are presented that verify the concept of interleaving.
Preliminary work to implement interleaving is presented, and future work is
recommended.
Subjects/Keywords: Fuel cells;
Electric power systems;
Direct energy conversion;
Energy conservation
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APA ·
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APA (6th Edition):
Raji, A. K. (2008). Modelling and development of fuel cell off grid power converter system
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1090
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Raji, Atanda Kamoru. “Modelling and development of fuel cell off grid power converter system
.” 2008. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1090.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Raji, Atanda Kamoru. “Modelling and development of fuel cell off grid power converter system
.” 2008. Web. 02 Mar 2021.
Vancouver:
Raji AK. Modelling and development of fuel cell off grid power converter system
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2008. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1090.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Raji AK. Modelling and development of fuel cell off grid power converter system
. [Thesis]. Cape Peninsula University of Technology; 2008. Available from: http://etd.cput.ac.za/handle/20.500.11838/1090
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
10.
Ayeleso, Ayokunle Oluwaseun.
An extreme ultraviolet and plasma spectrometer scientific payload for a cubesat
.
Degree: 2014, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1091
► In the Earth’s upper atmosphere, damage to spacecraft electronics is caused by the exposure to extreme ultraviolet (EUV) radiation, solar protons and cosmic rays emanating…
(more)
▼ In the Earth’s upper atmosphere, damage to spacecraft electronics is caused by the exposure to extreme ultraviolet (EUV) radiation, solar protons and cosmic rays emanating from the Sun. One particular region where these types of radiation occur is the South Atlantic Magnetic Anomaly (SAMA) region. Therefore, there is a need to design sensors which could be used to investigate the flux and energy levels of radiation in this region. In order to do so, the present study focuses on the numerical simulations of plasma (atomic oxygen ion) in the ionosphere’s F-layer region using the principle of Langmuir single probe theory. Another goal of this study is to investigate the behaviour of a copper plate sensor under exposure to ultraviolet (UV) radiation through simulation and experimentation in a laboratory setting in terms of the photoelectric effect principle.
Simulation results of the plasma model of the ionosphere’s F-layer region using an ideal single spherical probe showed that ionospheric plasma parameters such as electron temperature and electron density can be determined using the I−V characteristic curve obtained from the probe. Similarly, the simulation results of the behaviour of the copper plate under exposure to UV radiation showed that UV light with wavelengths shorter than 237 nm produced photocurrents. After calculations and simulations, the stopping potentials that could decelerate electrons emitted with UV radiation wavelengths between 100 nm and 237 nm are, respectively, between -7.6 V and -0.2 V. When comparing the calculated copper stopping potentials with the simulated copper stopping potentials, the results converge for shorter wavelengths. These short wavelengths are relevant in this study because they are comparable to EUV wavelengths (10 nm to 121 nm) in the SAMA region. Therefore, the stopping potential results were used in the experimental design and VUV radiation testing of the sensor prototypes.
Two different copper sensor prototypes, namely a spherical extreme ultraviolet and plasma spectrometer (SEPS) sensor and a planar sensor were designed and constructed for the realisation of this project. The planar sensor, with dimensions that fit on the sides of a one unit (1U) CubeSat was developed to minimise the experimental uncertainty observed with the SEPS sensor. The aim of this study is to characterise the sensors and their responses to typical plasma and EUV radiation levels using the facilities available in the Western Cape region (South Africa). Plasma testing was not investigated due to lack of test facilities. Therefore, the investigation into plasma measurements was simulation-based. Experimental EUV radiation testing was conducted. Extreme ultraviolet radiation measurements were performed with different vacuum ultraviolet (VUV) sources, namely a pulsed laser and a deuterium lamp (steady) radiation. These measurements posed challenges due to the significant ambient noise present in the laboratory. Consequently, the study looked at both
time and frequency domain analyses as avenues to…
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APA ·
Chicago ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ayeleso, A. O. (2014). An extreme ultraviolet and plasma spectrometer scientific payload for a cubesat
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1091
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ayeleso, Ayokunle Oluwaseun. “An extreme ultraviolet and plasma spectrometer scientific payload for a cubesat
.” 2014. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1091.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ayeleso, Ayokunle Oluwaseun. “An extreme ultraviolet and plasma spectrometer scientific payload for a cubesat
.” 2014. Web. 02 Mar 2021.
Vancouver:
Ayeleso AO. An extreme ultraviolet and plasma spectrometer scientific payload for a cubesat
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2014. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1091.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ayeleso AO. An extreme ultraviolet and plasma spectrometer scientific payload for a cubesat
. [Thesis]. Cape Peninsula University of Technology; 2014. Available from: http://etd.cput.ac.za/handle/20.500.11838/1091
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
11.
Davies, Edward.
Development of a hand-held multicell inverter-based ultrasonic plastic welder
.
Degree: 2009, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1093
► This thesis presents the design and development of a multicell inverter for ultrasonic plastic welding applications and other ultrasonic applications. An overview of the main…
(more)
▼ This thesis presents the design and development of a multicell inverter for ultrasonic plastic
welding applications and other ultrasonic applications. An overview of the main multilevel
topologies is given, but this research focuses on the multicelll inverter, because of its
capacitor voltage balancing properties.
Loading effects of various plastic materials to an ultrasonic plastic welding tool are provided
in this thesis. A simple method to create an approximate electrical equivalent circuit of the
ultrasonic welding tool, using an impedance analyser, loaded with different plastics is
discussed and illustrated.
Experimental results of the four-level multicell inverter driving a resistive load and an
ultrasonic transducer tool are presented in this thesis. These results provide proof that the
multicell inverter topology is capable of driving a non-linear load.
The inverter was tested with the ultrasonic load as an ultrasonic plastic welder and an
ultrasonic drill. The welding joints on the plastic samples are also evaluated in order to
evaluate whether or not this solution is suitable for plastic welding. The ultrasonic drilling
results are also shown in this thesis.
It is further illustrated that the ultrasonic tool and power supply combination may be used in
other ultrasonic applications.
Subjects/Keywords: Plastics – Welding;
Ultrasonic welding
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Davies, E. (2009). Development of a hand-held multicell inverter-based ultrasonic plastic welder
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1093
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Davies, Edward. “Development of a hand-held multicell inverter-based ultrasonic plastic welder
.” 2009. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1093.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Davies, Edward. “Development of a hand-held multicell inverter-based ultrasonic plastic welder
.” 2009. Web. 02 Mar 2021.
Vancouver:
Davies E. Development of a hand-held multicell inverter-based ultrasonic plastic welder
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2009. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1093.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Davies E. Development of a hand-held multicell inverter-based ultrasonic plastic welder
. [Thesis]. Cape Peninsula University of Technology; 2009. Available from: http://etd.cput.ac.za/handle/20.500.11838/1093
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
12.
Catherine, Quinton Shaun.
Effective geyser management through intelligent hot water usage profiling
.
Degree: 2009, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1094
► This study presents an intelligent Hot Water Cylinder (HWC) usage profiling system to provide peak demand side management and improve HWC efficiency in a typical…
(more)
▼ This study presents an intelligent Hot Water Cylinder (HWC) usage profiling system to
provide peak demand side management and improve HWC efficiency in a typical
household. In this research HWCs will be referred to as geysers.
Research was done into various techniques available to improve energy efficiency in
South Africa, as well as the different sectors South Africa's electricity supplier, Eskom,
has highlighted where improvements in energy efficiency can be made. From this it was
decided to refine the scope of the project to the residential sector, and more importantly
geyser. A typical geysers operation and power consumption was researched and analysed
to determine where efficiency improvements could be made. A system was required that
would reduce the amount of energy consumed by the geyser, and provide the consumer
with hot water at the same time. Based on the research it was decided to design a profile
based geyser controller. The profiling system comprised of a PIC microcontroller, four
digital temperature sensors and a time keeper used to determine individually based hot
water usage profiles for the home. The profile was based on three parameters, namely the
frequency (repetitiveness) of hot water being drawn, the length of the draw period, and
the time of day when the water was drawn. Once the profile had reached a 90% accuracy,
the profile implemented itself. Based on the profile, the controller then regulated the
temperature of the geyser according to the demand of the household, without manual
intervention. If the household's routine were changed, the profile would adapt itself
accordingly. The controller is therefore fully intelligent and continues to refine the profile
on a day to day basis. By introducing the profile based controller, the monthly average
geyser temperature was reduced, reducing the amount of standing losses, which in torn
reduced the total amount of energy consumed by the geyser. The profile controller was
designed to aid in the reduction of the energy demand of geysers on the power grid. This
will benefit both the consumer as well as Eskom, as Eskom will have a reduced power
load, and the consumer will have a reduced electricity bill. The results of the experiments
are shown, as well as a comparison between calculated versus measured results, to justify
the accuracy of the calculations.
Subjects/Keywords: Hot-water supply;
Water heaters;
Geysers
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Manager
APA (6th Edition):
Catherine, Q. S. (2009). Effective geyser management through intelligent hot water usage profiling
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1094
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Catherine, Quinton Shaun. “Effective geyser management through intelligent hot water usage profiling
.” 2009. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1094.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Catherine, Quinton Shaun. “Effective geyser management through intelligent hot water usage profiling
.” 2009. Web. 02 Mar 2021.
Vancouver:
Catherine QS. Effective geyser management through intelligent hot water usage profiling
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2009. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1094.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Catherine QS. Effective geyser management through intelligent hot water usage profiling
. [Thesis]. Cape Peninsula University of Technology; 2009. Available from: http://etd.cput.ac.za/handle/20.500.11838/1094
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
13.
Muga, Julius N'gon'ga.
Investigation of artificial neural networks for modeling, identification and control of nonlinear plant
.
Degree: 2009, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1097
► In real world systems such as the waste water treatment plants, the nonlinearities, uncertainty and complexity playa major role in their daily operations. Effective control…
(more)
▼ In real world systems such as the waste water treatment plants, the nonlinearities,
uncertainty and complexity playa major role in their daily operations. Effective control of such
systems variables requires robust control methods to accommodate the uncertainties and
harsh environments. It has been shown that intelligent control systems have the ability to
accommodate the system uncertain parameters. Techniques such as fuzzy logic, neural
networks and genetic algorithms have had many successes in the field of control because
they contain essential characteristics needed for the design of identifiers and controllers for
complex systems where nonlinearities, complexity and uncertainties exist.
Approaches based on neural networks have proven to be powerful tools for solvinq nonlinear
control and optimisation problems. This is because neural networks have the ability to learn
and approximate nonlinear functions arbitrarily wei!. The approximation capabilities of such
networks can be used for the design of both identifiers and controllers. Basically, an artificial
neural network is a computing architecture that consists of massively parallel
interconnections of simple computing elements that provide insights into the kind of highly
parallel computation that is carried out by biological nervous system. A large number of
networks have been proposed and investigated with various topological structures.
functionality and training algorithms for the purposes of identification and control of practical
systems.
For the purpose of this research thesis an approach for the investigation of the use of neural
networks in identification, modelling and control of non-linear systems has been carried out.
In particular, neural network identifiers and controllers have been designed for the control of
the dissolved oxygen (DO) concentration of the activated sludge process in waste water
treatment plants. These plants, being complex processes With several variables (states) and
also affected by disturbances require some form of control in order to maintain the standards
of effluent. DO concentration control in the aeration tank is the most widely used controlled
variable. Nonlinearity is a feature that describes the dynamics of the dissolved oxygen
process and therefore the DO estimation and control may not be sufficiently achieved with a
conventional linear controller.
Neural networks structures are proposed, trained and utilized for purposes of identification.
modelling and design of NN controllers for nonlinear DO control. Algorithms and programs
are developed using Matlab environment and are deployed on a hardware PLC platform. The
research is limited to the feedforward multilayer perceptron and the recurrent neural
networks for the identification and control. Control models considered are the direct inverse mode! control, internal mode! contra! and feedback linearizing control. Real-time
implementation is limited to the lab-scale wastewater treatment plant.
Subjects/Keywords: Neural networks (Computer science);
Nonlinear systems;
Artificial intelligence
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APA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Muga, J. N. (2009). Investigation of artificial neural networks for modeling, identification and control of nonlinear plant
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1097
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Muga, Julius N'gon'ga. “Investigation of artificial neural networks for modeling, identification and control of nonlinear plant
.” 2009. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1097.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Muga, Julius N'gon'ga. “Investigation of artificial neural networks for modeling, identification and control of nonlinear plant
.” 2009. Web. 02 Mar 2021.
Vancouver:
Muga JN. Investigation of artificial neural networks for modeling, identification and control of nonlinear plant
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2009. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1097.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Muga JN. Investigation of artificial neural networks for modeling, identification and control of nonlinear plant
. [Thesis]. Cape Peninsula University of Technology; 2009. Available from: http://etd.cput.ac.za/handle/20.500.11838/1097
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
14.
Kujane, Koketso Portia.
Investigation and development of methods for optimal control of the activated sludge process
.
Degree: 2009, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1099
► This project was started as a result of strict environmental and health regulations together with a demand tor cost effective operation of wastewater treatment plants…
(more)
▼ This project was started as a result of strict environmental and health regulations together
with a demand tor cost effective operation of wastewater treatment plants (VVWTPs). The
main aim of this project is how to keep effluent concentration below a prescribed limit at the
lowest possible cost. Due to large fluctuations in the quality and quantity of the influent
concentrations, traditional control methods are not adequate to achieve this aim The major
drawback with these methods is that the disturbances affect the process before the controller
has time to correct the error (Olsson and Newell, 1999: 454). This problem is addressed
through the use of modern control systems.
Modern control systems are model based predictive algorithms arranged as feed-forward
controllers (Olsson and Newell. 1999: 454). Normally a controller is equipped with a constant
set point; the goal In this project is to calculate an optimal DO trajectory that may be sampled
to provide a varying optimal set-point for the Activated Sludge Process, In this project an
optimal control problem Is formulated using DO concentration as a control variable. This
requires a model of the process to be controlled a mathematical expressions of the
limitations on the process input and output variables and finally the objective functional. which
consists of the objectives of the control.
The structures of the Benchmark plant (developed within the COST 682 working group) and
the Athlone WWTPs are used to implement this opt.mat control strategy in MATLAB. The
plant's full models are developed based on the mass balance principle incorporating the
activated sludge biological models: ,ASM1, ASM2, ASM2d and ASM3 (developed by the IWA
working groups). To be able to develop a method that may later on be used for online
control, the full models are reduced based on the technique In Lukasse (1996). To ensure
that the reduced models keep the same prediction capabilities as the full models, parameters
of the reduced models are calculated based on the Least Squares principle, The formulated
optimal control problem is solved based on the decompostion-coorcdination method that
involves time decomposition in a two layer structure.
MATLAB software [5 developed to solve the problems for parameter estimation. fun and
reduced mode! simulation. and optimal control calculation for the considered different cases
of plant structures and biological models. The obtained optimal 00 trajectories produced the
effluent state trajectories within prescribed requirements. These DO trajectories may be
implemented in different SCADA systems to be tracked as set points or desired trajectories
by different types of controllers.
Subjects/Keywords: Sewage;
Wastewater treatment;
Control theory;
Automatic control
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APA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Kujane, K. P. (2009). Investigation and development of methods for optimal control of the activated sludge process
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1099
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kujane, Koketso Portia. “Investigation and development of methods for optimal control of the activated sludge process
.” 2009. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1099.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kujane, Koketso Portia. “Investigation and development of methods for optimal control of the activated sludge process
.” 2009. Web. 02 Mar 2021.
Vancouver:
Kujane KP. Investigation and development of methods for optimal control of the activated sludge process
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2009. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1099.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kujane KP. Investigation and development of methods for optimal control of the activated sludge process
. [Thesis]. Cape Peninsula University of Technology; 2009. Available from: http://etd.cput.ac.za/handle/20.500.11838/1099
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
15.
Davids, Vernon Pete.
Implementation of a wideband microstrip phased array antenna for X-band radar applications
.
Degree: 2009, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1100
► This thesis presents the design, analysis and implementation of an eight-element phased array antenna for wideband X-band applications. The microstrip phased array antenna is designed…
(more)
▼ This thesis presents the design, analysis and implementation of an eight-element phased array
antenna for wideband X-band applications. The microstrip phased array antenna is designed
using eight quasi-Yagi antennas in a linear configuration and is printed on RT/Duroid
6010LM substrate made by Rogers Corporation. The feeding network entails a uniform
beamforming network as well as a non-uniform -25 dB Dolph-Tschebyscheff beamforming
network, each with and without 45° delay lines, generating a squinted beam 14° from
boresight. Antenna parameters such as gain, radiation patterns and impedance bandwidth
(BW) are investigated in the single element as well as the array environment. Mutual coupling
between the elements in the array is also predicted.
The quasi-Yagi radiator employed as radiating element in the array measured an exceptional
impedance bandwidth (BW) of 50% for a S11 < -10 dB from 6 GHz to 14 GHz, with 3 dB to
5 dB of absolute gain in the frequency range from 8 GHz to 11.5 GHz. The uniform broadside
array measured an impedance BW of 20% over the frequency band and a gain between 9 dB
to 11 dB, whereas the non-uniform broadside array measured a gain of 9 dB to 11 dB and an
impedance BW of 14.5%. Radiation patterns are stable across the X-band. Beam scanning is
illustrated in the E-plane for the uniform array as well as for the non-uniform array.
Subjects/Keywords: Radar – Antennas;
Antennas (Electronics);
Antenna arrays;
Strip transmission lines
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Davids, V. P. (2009). Implementation of a wideband microstrip phased array antenna for X-band radar applications
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1100
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Davids, Vernon Pete. “Implementation of a wideband microstrip phased array antenna for X-band radar applications
.” 2009. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1100.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Davids, Vernon Pete. “Implementation of a wideband microstrip phased array antenna for X-band radar applications
.” 2009. Web. 02 Mar 2021.
Vancouver:
Davids VP. Implementation of a wideband microstrip phased array antenna for X-band radar applications
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2009. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1100.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Davids VP. Implementation of a wideband microstrip phased array antenna for X-band radar applications
. [Thesis]. Cape Peninsula University of Technology; 2009. Available from: http://etd.cput.ac.za/handle/20.500.11838/1100
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
16.
Smith, Johan.
High voltage direct current strategy solving power delivery shortages to localized area of national grid
.
Degree: 2009, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1102
► The industrial and population growth of a nation can cause power delivery problems to localized areas of a national grid through their increased demand for…
(more)
▼ The industrial and population growth of a nation can cause power delivery problems to
localized areas of a national grid through their increased demand for electrical energy. One
reason for these power shortages is the insufficient current carrying capacity of existing high
voltage alternating current, (HVAC), transmission lines supplying the area. High voltage
direct current (HVDC) transmission lines are a possible solution as they provide better power
delivery than HVAC lines.
New or upgraded HVAC lines, or HVDC lines or combinations of HVAC and HVDC lines are
possible solutions to improve power delivery. This research investigates the various line
possibilities using theory. and cutting edge frequency and time domain software tools. The
challenge is how to approach this problem. What methodology or structure should be used?
Thus one of the contributions of this work is the development of a strategy (flow chart), for
solving power delivery problems to localized areas of a national grid through individual or
combinations (e.g. parallel operation) of HVAC and/or HVDC transmission lines. The main
contribution is the evaluation of a HVDC system as a solution to overcoming power delivery
shortages to a localized area of a national grid.
Three different software packages (two industrial and one academic) namely,
PSCAD/EMTDC (time domain), DlgSILENT PowerFactory (frequency domain) and MathCAD
software are evaluated for their capability to perform the simulation studies necessary to
prove the possible solutions given in the developed flow chart. The PSCAD/EMTDC software
package is evaluated for integrated HVAC/HVDC load flow analyses, DlgSILENT for
individual and parallel combinations of HVAC lines and MathCAD to prove hand calculations
to software results.
Five case studies are conducted. The first case study demonstrates a healthy system with no
delivery shortcomings, the second case study portrays the delivery shortcoming due to
increased localized area demand, and the remaining three case studies explore possible
solutions to solve the problem. The first possible solution is to construct an identical HVAC
line in parallel to the existing line.
Subjects/Keywords: Electric power distribution – High tension;
High voltages;
Electric currents, Alternating;
Flexible AC transmission systems;
Electrical engineering
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Smith, J. (2009). High voltage direct current strategy solving power delivery shortages to localized area of national grid
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1102
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Smith, Johan. “High voltage direct current strategy solving power delivery shortages to localized area of national grid
.” 2009. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1102.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Smith, Johan. “High voltage direct current strategy solving power delivery shortages to localized area of national grid
.” 2009. Web. 02 Mar 2021.
Vancouver:
Smith J. High voltage direct current strategy solving power delivery shortages to localized area of national grid
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2009. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1102.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Smith J. High voltage direct current strategy solving power delivery shortages to localized area of national grid
. [Thesis]. Cape Peninsula University of Technology; 2009. Available from: http://etd.cput.ac.za/handle/20.500.11838/1102
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
17.
Negumbo, Rosalia.
Analysis for electrical energy and overall efficiency in distribution networks with harmonic distortion
.
Degree: 2009, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1103
► Traditionally, harmonics are ignored in overall efficiency and energy usage studies. However, in the modern era, power systems contain levels of harmonics which can no…
(more)
▼ Traditionally, harmonics are ignored in overall efficiency and energy usage studies. However,
in the modern era, power systems contain levels of harmonics which can no longer be
ignored by engineers, planners, energy conservationists and economists. The directions of
power flows have to be considered when harmonics are present in the power network.
A methodology and new formulae for individual and overall efficiency and energy usage is
developed at each frequency (f1, h and H) and forms the main contribution to research in this
field.
Two case studies were conducted; a measurement based laboratory experiment set-up and a simulated case study. In the set-up, measurements of current, voltage and power at different points in the network for the 1st, 5th and 7th frequencies were taken. Current and voltage results were used for hand calculations to prove the measured power flows and directions. The measurements were taken with a Fluke 345 three-phase harmonic power quality analyzer. For the simulated case study, a network was investigated using the DIgSILENT and SuperHarm software packages. Their results were compared and it was found that DIgSILENT is the preferred package for power results.
It was found that the total harmonic distortion limit for voltage in the simulated network
exceeded an acceptable level. The harmonic mitigation solution chosen was to design a
passive filter to decrease the distortion by shifting the resonance point of the network. The
method to design the passive filter and its impact on efficiency and energy usage is included
in the thesis.
Unique power flow direction diagrams are developed as part of the methodology and form an
essential step in the derivation of the new formulae. Efficiencies, power losses and energy
usage at individual and combined frequencies were determined. Results showed the
negative effects of harmonics on overall efficiency, energy usage and power losses of the
system. The methodology and new formulae developed was found to be effective and their
application is recommended for use by industry.
Subjects/Keywords: Electric power distribution;
Harmonics (Electric waves);
Electricity
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Negumbo, R. (2009). Analysis for electrical energy and overall efficiency in distribution networks with harmonic distortion
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1103
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Negumbo, Rosalia. “Analysis for electrical energy and overall efficiency in distribution networks with harmonic distortion
.” 2009. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1103.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Negumbo, Rosalia. “Analysis for electrical energy and overall efficiency in distribution networks with harmonic distortion
.” 2009. Web. 02 Mar 2021.
Vancouver:
Negumbo R. Analysis for electrical energy and overall efficiency in distribution networks with harmonic distortion
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2009. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1103.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Negumbo R. Analysis for electrical energy and overall efficiency in distribution networks with harmonic distortion
. [Thesis]. Cape Peninsula University of Technology; 2009. Available from: http://etd.cput.ac.za/handle/20.500.11838/1103
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
18.
Burger, Gert Cloete.
Optimisation of the pulse-echo method with an application to acoustic thermometry
.
Degree: 2010, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1105
► In acoustics, pulse echo methods are well known as a means of measuring time of Hight. Traditional techniques for generating acoustic waves in solid ferromagnetic…
(more)
▼ In acoustics, pulse echo methods are well known as a means of measuring time of Hight. Traditional
techniques for generating acoustic waves in solid ferromagnetic waveguides include piezoelectric,
capacitive and magnetostriction. Piezoelectric and capacitive techniques are preferred
due to the inefficiency of magnetostriction caused by electro-mechanical coupling losses and the
fact that most ferromagnetic materials show low levels of magnetostriction. The aim of this
study was to optimise the magnetostrictive effects for sensing applications based on a ferromagnetic
waveguide using the pulse echo method. The results obtained were implemented in the
design of an acoustic thermometer.
Two configurations for signal generation and recovery were examined, the use of a single
wound copper coil acting as a transceiver coil, and the use of separate transmit and receive
coils. Results obtained using the latter configuration indicated better signal to noise ratio's and
provided the flexibility to manipulate the point of signal recovery. The pulse echo method was
implemented and optimised.
An acoustic thermometer based on an existing design was developed by inducing a partial
reflection from a set position in the waveguide, defining a sensing probe. Awareness of the elastic
properties of the waveguide material enabled the guaging of its temperature by measuring the
acoustic pulse velocity in the probe.
The accuracy of the instrument was increased through signal conditioning, examined together
with cross correlation and an increased sampling frequency. Systematic errors were resolved
through calibration, giving the instrument an overall accuracy of ±O.56"C for the range of
temperatures between 2O"C and 400"C.
Subjects/Keywords: Acoustics – Sound-waves;
Magnetostriction
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Burger, G. C. (2010). Optimisation of the pulse-echo method with an application to acoustic thermometry
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1105
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Burger, Gert Cloete. “Optimisation of the pulse-echo method with an application to acoustic thermometry
.” 2010. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1105.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Burger, Gert Cloete. “Optimisation of the pulse-echo method with an application to acoustic thermometry
.” 2010. Web. 02 Mar 2021.
Vancouver:
Burger GC. Optimisation of the pulse-echo method with an application to acoustic thermometry
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2010. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1105.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Burger GC. Optimisation of the pulse-echo method with an application to acoustic thermometry
. [Thesis]. Cape Peninsula University of Technology; 2010. Available from: http://etd.cput.ac.za/handle/20.500.11838/1105
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
19.
Nketoane, Paseka Augustinus.
Design and implementation of a nonlinear controller in PLC as a part of an adroit scada system for optimal adaptive control of the activated sludge process
.
Degree: 2009, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1106
► More than 70% of the earth's surface is covered by water, only a small part of which is suitable for either human consumption or agricultural…
(more)
▼ More than 70% of the earth's surface is covered by water, only a small part of which is
suitable for either human consumption or agricultural use. Due to pollution from agriculture,
households and industry reaching rivers, lakes and seas it is Important for wastewater to be
properly treated in order to remove harmful substances before it reaches the environment.
Strict environmental and health regulations together with a demand for cost effective ways of
wastewater treatment have made control technology in wastewater Treatment Plants an
important priority. Dissolved oxygen (DO) is the amount of oxygen in the effluent and it plays
a vital role of controlling VV\YTP. Oxygen dissolves in water through mixing water surface
with the atmosphere, The dissolved oxygen concentration in the aerobic part of an activated
sludge process should be sufficiently high to supply enough oxygen to the microorganisms in
the sludge. an excessive high DO leads to high energy consumption and may also
deteriorate the sludge quality, A high DO concentration in the internally recirculated water
also makes the denitrification less efficient Hence, both for economical and process
reasons, it is of interest to control the DO. The used controllers are normally linear
controllers, proportional integral (PI) or proportional integral derivative (PID) ones. The work
of these controllers leads to bad system performance, because, the process of dissolving
oxygen into the wastewater is a nonlinear process and requires nonlinear control.
The aim of the research project is to develop methods for design of linear and nonlinear
controllers of the concentration of the DO in the aeration tank of the WWTP and to implement
the designed controllers in the frameworks of PLC. The nonlinear linearizing controller based
on a reference model and Lyapunov second method is designed. Additionally a linear
controller is developed in a form of PI controller based on pole placement method to improve,
the performance of the closed loop system. The resultant controller is to be on
a PLC as a part of Adroit SCADA system. The developed programmes are used to control
the wastewater treatment process in laboratory scale plant and can be applied as a part of
SCADA software for control of the wastewater treatment plants.
Subjects/Keywords: Sewage – Purification;
Wastewater treatment – South Africa;
Nonlinear control theory;
Adaptive control systems;
System analysis;
MATLAB
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Nketoane, P. A. (2009). Design and implementation of a nonlinear controller in PLC as a part of an adroit scada system for optimal adaptive control of the activated sludge process
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1106
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Nketoane, Paseka Augustinus. “Design and implementation of a nonlinear controller in PLC as a part of an adroit scada system for optimal adaptive control of the activated sludge process
.” 2009. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1106.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Nketoane, Paseka Augustinus. “Design and implementation of a nonlinear controller in PLC as a part of an adroit scada system for optimal adaptive control of the activated sludge process
.” 2009. Web. 02 Mar 2021.
Vancouver:
Nketoane PA. Design and implementation of a nonlinear controller in PLC as a part of an adroit scada system for optimal adaptive control of the activated sludge process
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2009. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1106.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Nketoane PA. Design and implementation of a nonlinear controller in PLC as a part of an adroit scada system for optimal adaptive control of the activated sludge process
. [Thesis]. Cape Peninsula University of Technology; 2009. Available from: http://etd.cput.ac.za/handle/20.500.11838/1106
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
20.
Mbango, Fessor.
Investigation into alternative protection solutions for distribution networks
.
Degree: 2009, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1107
► Recently, due to concerns about the liberalization of electricity supply, deregulation and global impact on the environment, securing a reliable power supply has become an…
(more)
▼ Recently, due to concerns about the liberalization of electricity supply, deregulation and global
impact on the environment, securing a reliable power supply has become an important social
need worldwide To ensure this need is fulfilled, detailed investigations and developments are In
progress on power distribution systems protection and the monitoring of apparatus which Is part
of the thesis.
The main objective of a protection schemes is mainly to keep the power system stable by
isolating only the affected components or the section of the electricity network in which the fault
has developed while allowing the rest of the network to continue operating. It is important to
note that the protection equipment does not prevent faults from occurring, but it limits the
damaging effect of the fault and protects other healthy equipment. This is only achieved if the
protection system of the electrical network involved complies with the requirements and purpose
of the electrical protection standards. These requirements include the Operational speed,
Reliability, Security and Sensitivity. In conventional substations that are still existing Within the
utilities networks, a number of long cables are then used to complete the links between
substation equipment in order for them to communicate (hardwired). This method is
uneconomical and is being phased out completely in the near future. Over the last few years a
new standard for substation automation communication has been developed Within the
International Electrotechnical Commission (IEC), the IEC 61850.
This standard defines the integration requirements of multi-vendor compliant relays and other
lED's for multiple protection schemes as well as control and automation techniques. In this
particular thesis, Distribution protection is the area of interest, particularly the application of
Time and Overcurrent protection schemes. A look into different protection alternatives and the
application of new technologies for Electrical Power Distribution Systems that unify protection
and control units so that they can be incorporated into Intelligent Substation as opposed to the
most existing (conventional substation) is analyzed. The proposed algorithm has been verified
through simulations of the CPUT and Eureka three phase power distribution systems. A testing
Lab is also part of this thesis and Is meant for experiments as well as simulation performance in
order to gain knowledge and skills for designing and engineer substations with lEG 61850
standards equiprnents. The results indicate that the reduction of copper wiring cable has
increased and the communication speed has improved and simplified.
Subjects/Keywords: Electric power distribution – Protection;
Electric change and distribution – Protection;
Electric power transmission
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APA ·
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mbango, F. (2009). Investigation into alternative protection solutions for distribution networks
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1107
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mbango, Fessor. “Investigation into alternative protection solutions for distribution networks
.” 2009. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1107.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mbango, Fessor. “Investigation into alternative protection solutions for distribution networks
.” 2009. Web. 02 Mar 2021.
Vancouver:
Mbango F. Investigation into alternative protection solutions for distribution networks
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2009. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1107.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mbango F. Investigation into alternative protection solutions for distribution networks
. [Thesis]. Cape Peninsula University of Technology; 2009. Available from: http://etd.cput.ac.za/handle/20.500.11838/1107
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
21.
Prinsloo, Nick.
Design and development of a battery cell voltage monitoring system
.
Degree: 2011, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1109
► The purpose of this thesis was to design and develop a measurement system that would allow accurate measurement of individual cell voltages in a series…
(more)
▼ The purpose of this thesis was to design and develop a measurement system that would allow
accurate measurement of individual cell voltages in a series cell stack.
The system was initially proposed to be used in conjunction with an active cell balancer. This would
allow for the efficient equalising of cells as well as provide detailed information on the cell stack and
how the stack operates over time. Having a system that measures voltages accurately, with which
the active cell balancer can be controlled would allow for peak cell lifetime and performance.
Current battery management systems are large, complex and inefficient and a new way of battery
management had to be investigated.
To accurately measure individual cells in a series stack, the high common mode voltage must be
negated. Different techniques that are currently used to create galvanic isolation were reviewed;
circuits were designed and were simulated to find the most suitable design.
The traditional methods used to create galvanic isolation did not provide adequate results. The
methods were too inefficient and not accurate enough to be used. The methods that had the
required accuracy were too complicated to connect in a useable system.
This led to the investigation of integrated circuits created to measure voltages in large cell stacks. An
integrated circuit from Linear Technology was chosen and a system was built. A system was thus
designed that fulfilled the most desirable design specifications while delivering excellent results.
The system allowed accurate, individual voltages to be measured in the presence of high common
mode voltages. Accuracies and measurement time were well below the required system
specification. Power consumption was high, but different component choice will lower power
consumption to within specification. Excellent results were obtained overall with most, although not
all results well below the design specifications.
By including current measurements, as well as other technologies such as wireless communication,
USB connectivity and a better data processor, this system will be at the forefront of current battery
management technology.
Subjects/Keywords: Electric batteries;
Battery monitoring system
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APA ·
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MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Prinsloo, N. (2011). Design and development of a battery cell voltage monitoring system
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1109
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Prinsloo, Nick. “Design and development of a battery cell voltage monitoring system
.” 2011. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1109.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Prinsloo, Nick. “Design and development of a battery cell voltage monitoring system
.” 2011. Web. 02 Mar 2021.
Vancouver:
Prinsloo N. Design and development of a battery cell voltage monitoring system
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2011. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1109.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Prinsloo N. Design and development of a battery cell voltage monitoring system
. [Thesis]. Cape Peninsula University of Technology; 2011. Available from: http://etd.cput.ac.za/handle/20.500.11838/1109
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
22.
Mbangeni, Litha.
Development of methods for parallel computation of the solution of the problem for optimal control
.
Degree: 2010, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1110
► Optimal control of fermentation processes is necessary for better behaviour of the process in order to achieve maximum production of product and biomass. The problem…
(more)
▼ Optimal control of fermentation processes is necessary for better behaviour of the
process in order to achieve maximum production of product and biomass. The problem
for optimal control is a very complex nonlinear, dynamic problem requiring long time for
calculation Application of decomposition-coordinating methods for the solution of this
type of problems simplifies the solution if it is implemented in a parallel way in a cluster of
computers. Parallel computing can reduce tremendously the time of calculation through
process of distribution and parallelization of the computation algorithm. These processes
can be achieved in different ways using the characteristics of the problem for optimal
control.
Problem for optimal control of a fed-batch, batch and continuous fermentation processes
for production of biomass and product are formulated. The problems are based on a
criterion for maximum production of biomass at the end of the fermentation process for
the fed-batch process, maximum production of metabolite at the end of the fermentation
for the batch fermentation process and minimum time for achieving steady state
fermentor behavior for the continuous process and on unstructured mass balance
biological models incorporating in the kinetic coefficients, the physiochemical variables
considered as control inputs. An augmented functional of Lagrange is applied and its
decomposition in time domain is used with a new coordinating vector. Parallel computing
in a Matlab cluster is used to solve the above optimal control problems. The calculations
and tasks allocation to the cluster workers are based on a shared memory architecture.
Real-time control implementation of calculation algorithms using a cluster of computers
allows quick and simpler solutions to the optimal control problems.
Subjects/Keywords: Digital control systems;
Programmable contollers;
Intelligent contol systems;
Parallel processing (Electronic computers);
MATLAB;
Engineering mathematics – Data processing;
Control theory
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to Zotero / EndNote / Reference
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APA (6th Edition):
Mbangeni, L. (2010). Development of methods for parallel computation of the solution of the problem for optimal control
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1110
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mbangeni, Litha. “Development of methods for parallel computation of the solution of the problem for optimal control
.” 2010. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1110.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mbangeni, Litha. “Development of methods for parallel computation of the solution of the problem for optimal control
.” 2010. Web. 02 Mar 2021.
Vancouver:
Mbangeni L. Development of methods for parallel computation of the solution of the problem for optimal control
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2010. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1110.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mbangeni L. Development of methods for parallel computation of the solution of the problem for optimal control
. [Thesis]. Cape Peninsula University of Technology; 2010. Available from: http://etd.cput.ac.za/handle/20.500.11838/1110
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
23.
Motjolopane, Bokang Patrick.
A power harvesting technique to facilitate energy conversion in distributed wireless sensor networks
.
Degree: 2008, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1113
► Distributed wireless sensor networks (DWSNs) are applied in a variety of applications that can enhance the quality of human life or even save lives, such…
(more)
▼ Distributed wireless sensor networks (DWSNs) are applied in a variety of applications that can enhance the quality of human life or even save lives, such as in fire monitoring, where DWSN microsensors relay the exact location of the fire to water sprinkler actors to automatically extinguish the fire. Batteries are currently the predominant source of energy in DWSNs. one of the key obstacles in the adoption of DWSN technology is the limited lifetime of batteries in microsensors. Recharging or replacing depleted batteries can significantly increase costs in DWSNs. The aim of this study is to address the power challenge in DWSNs by proposing a sixteen-element equiangular spiral rectenna to ahrvest ambient microwave energy to supply indoor DWSNs. The study concludes that this rectenna model has the potential to generate power that enables long periods of operation of the DWSNs without human intervention in the power manageement process, thus reducing maintenance and administration costs. The efficiency of the rectenna model was tested in an anechoic chamber. Efficiency test results indicated that the highest efficiency of 2% for the rectenna model was achieved as 2 GHz for an ambient power of -6 dBm across a 1 K ohm load resistence. The study further concludes that the current rectenna model size of sixteen elements is a limiting factor for the deployment of DWSNs.
Subjects/Keywords: Sensor networks;
Energy consumption;
Wireless communication systems
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APA ·
Chicago ·
MLA ·
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Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Motjolopane, B. P. (2008). A power harvesting technique to facilitate energy conversion in distributed wireless sensor networks
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1113
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Motjolopane, Bokang Patrick. “A power harvesting technique to facilitate energy conversion in distributed wireless sensor networks
.” 2008. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1113.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Motjolopane, Bokang Patrick. “A power harvesting technique to facilitate energy conversion in distributed wireless sensor networks
.” 2008. Web. 02 Mar 2021.
Vancouver:
Motjolopane BP. A power harvesting technique to facilitate energy conversion in distributed wireless sensor networks
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2008. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1113.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Motjolopane BP. A power harvesting technique to facilitate energy conversion in distributed wireless sensor networks
. [Thesis]. Cape Peninsula University of Technology; 2008. Available from: http://etd.cput.ac.za/handle/20.500.11838/1113
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
24.
Quibell, Jason.
Digital control of a Class-D Audio Amplifier
.
Degree: 2011, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1116
► Modern technologies have led to extensive digital music reproduction and distribution. It is fitting then that digital audio be amplified directly from its source rather…
(more)
▼ Modern technologies have led to extensive digital music reproduction and distribution.
It is fitting then that digital audio be amplified directly from its
source rather than being converted to an analogue waveform before amplification.
The benefits of using a digital controller for audio processing include
being able to easily reconfigure the system and to add additional functions at
a later stage.Digital audio is primarily stored as Pulse Code Modulation (PCM) while
Pulse Width Modulation (PWM) is the most popular scheme used to drive
a class-D amplifier. The class-D amplifier is selected in many applications
due to its very high energy efficiency. Conventional PCM to PWM conversion
is inherently nonlinear. Various interpolation schemes are presented in this
research project which help to address the nonlinearity.Digitally generated PWM has a limited resolution which is constrained
by the system clock. This thesis presents noise shaping techniques which
increase the effective resolution of the PWM process without having to use an
excessively high system clock. Noise shaping allows a low resolution modulator
to be used to reproduce high resolution audio.
Subjects/Keywords: Digital control systems;
Audio amplifiers;
Amplifiers (Electronics)
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Quibell, J. (2011). Digital control of a Class-D Audio Amplifier
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1116
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Quibell, Jason. “Digital control of a Class-D Audio Amplifier
.” 2011. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1116.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Quibell, Jason. “Digital control of a Class-D Audio Amplifier
.” 2011. Web. 02 Mar 2021.
Vancouver:
Quibell J. Digital control of a Class-D Audio Amplifier
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2011. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1116.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Quibell J. Digital control of a Class-D Audio Amplifier
. [Thesis]. Cape Peninsula University of Technology; 2011. Available from: http://etd.cput.ac.za/handle/20.500.11838/1116
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
25.
Matthews, Alistair Marc.
Controller & modification of a light hub-motor propelled electric wheelchair
.
Degree: 2012, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1131
► Due to the complex design of existing electric mobility vehicles in South Africa and their imported parts, make them unaffordable to the majority of disabled…
(more)
▼ Due to the complex design of existing electric mobility vehicles in South Africa and their imported parts, make them unaffordable to the majority of disabled people in South Africa. The traditional electric units are also not practical for use in rural areas due to the heavy, bulky design. The scope of this study was to investigate various designs using existing wheelchair frame designs, low cost three phase hub motors and various electronic techniques to achieve the desired functionality. An attempt was be made to remove inefficient and expensive DC brush motors and the gear boxes associated with the traditional design of wheelchairs, while still allowing the unit to fold like the traditional manual chair design.
One of the aims for this electric wheelchair was to utilise existing large radius wheels, typical of manual wheelchairs and a modified traditional frame design, providing the clearance often necessary to overcome rough terrain whilst enabling the chair to be used as a manual wheelchair should the battery fail. One of the primary aims of the project was to develop a method for an electric assist feature built into the modified electric wheelchair, whereby the force applied to the manual pushrims on the wheels would be measured and the electric component would proportionally assist the user. This option suits the users who are weak but not physically disabled. One of the many focal points here would be on HIV/AIDS patients, which is prevalent in South Africa, who may require a wheelchair when debilitated with this disease. The electric assist portion of the design would act similarly to a wireless self-powered torque sensor, allowing for an array of applications besides the electric assist portion of this project.
A recent survey by National Government indicated that over 85% of wheelchair users only generated an income of between R0 – R500 per month. Low state disability grants and wage figures for disabled and HIV/AIDS patients mean that electric mobility vehicles have become a luxury rather than an essential commodity in South Africa. The need for cheap electric wheelchairs that could cope with the rural terrain and could be fitted onto existing manual wheelchairs offering the full manual operation should the batteries go flat, was clearly apparent. The cost of an electric wheelchair ranges from R18 000 with more advanced models escalating in price to well over R150 000. These prices were typically the result of the complexity of the unit and local wheelchair manufacturers having to import 80% of their parts from abroad. The largest local manufacturer is CE Mobility which is the dominant mobility vehicle supplier in Southern Africa and has the only SABS approved units for sale. Our complete redesigned wheelchair including the manual frame supplied by an existing supplier would only cost R9 000. A prototype demonstrated that is was possible to build a wheelchair that meets all these criteria. A cost effective unit could provide a solution to assist and enable economically challenged and disabled people…
Subjects/Keywords: wheelchair;
light hub-motor
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Matthews, A. M. (2012). Controller & modification of a light hub-motor propelled electric wheelchair
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1131
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Matthews, Alistair Marc. “Controller & modification of a light hub-motor propelled electric wheelchair
.” 2012. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1131.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Matthews, Alistair Marc. “Controller & modification of a light hub-motor propelled electric wheelchair
.” 2012. Web. 02 Mar 2021.
Vancouver:
Matthews AM. Controller & modification of a light hub-motor propelled electric wheelchair
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2012. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1131.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Matthews AM. Controller & modification of a light hub-motor propelled electric wheelchair
. [Thesis]. Cape Peninsula University of Technology; 2012. Available from: http://etd.cput.ac.za/handle/20.500.11838/1131
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
26.
Steenkamp, Leon.
Wireless sensor network monitoring using the Simple Network Management Protocol
.
Degree: 2012, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1139
► Wireless sensor networks (WSNs) have long been separate networks using non-standard, custom and application speci c protocols. The arrival of IPv6 over Low power Wireless…
(more)
▼ Wireless sensor networks (WSNs) have long been separate networks using non-standard,
custom and application speci c protocols. The arrival of IPv6 over Low power Wireless
Personal Area Network (6LoWPAN) changes this, with the Internet Protocol (IP) being
the common protocol between conventional IP networks and Wireless Sensor Networks. Through the use of 6LoWPAN implementations like blip, developed for the WSN
operating system TinyOS, it is possible to make use of the advantages that the common
IP layer brings. This includes the reuse of techniques, protocols and software that are
already developed for, and in use on, conventional IP networks.One such protocol is the Simple Network Management Protocol (SNMP), which is a
User Datagram Protocol (UDP) based protocol used for monitoring and management in
conventional IP networks. This work describes an implementation of the rst version of the SNMP in nesC for
TinyOS using the blip 6LoWPAN implementation. The SNMPv1 software agent imple-
mentation requires no modi cation to the 6LoWPAN stack and responds to standard
SNMP get and set requests. This means that standard SNMP software can be used to
communicate with the implemented SNMP software agent. Therefore network monitoring
packages like Nagios and Cacti can be used to monitor wireless sensor networks.Relevant background information is discussed, ranging from the division of commu-
nication between network nodes into logical layers, to similar work done and the Simple
Network Management Protocol. The implementation of the SNMP software agent is ex-
amined, along with the anatomy of an SNMP GetRequest message in aid of understanding
the structure of SNMP messages.The SNMP agent implementation is then tested against network monitoring tools like
Cacti, Nagios and applications from the Net-SNMP package. The results verify the correct
operation of the SNMP software agent and demonstrate the added functionality that the
software agent provides.
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Steenkamp, L. (2012). Wireless sensor network monitoring using the Simple Network Management Protocol
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1139
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Steenkamp, Leon. “Wireless sensor network monitoring using the Simple Network Management Protocol
.” 2012. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1139.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Steenkamp, Leon. “Wireless sensor network monitoring using the Simple Network Management Protocol
.” 2012. Web. 02 Mar 2021.
Vancouver:
Steenkamp L. Wireless sensor network monitoring using the Simple Network Management Protocol
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2012. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1139.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Steenkamp L. Wireless sensor network monitoring using the Simple Network Management Protocol
. [Thesis]. Cape Peninsula University of Technology; 2012. Available from: http://etd.cput.ac.za/handle/20.500.11838/1139
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
27.
Nduku, Nyaniso Prudent.
Development of methods for distribution network power quality variation monitoring
.
Degree: 2009, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1144
► The purpose of this project is to develop methods for distribution network power quality' variations monitoring. Power quality (PO) has become a significant issue for…
(more)
▼ The purpose of this project is to develop methods for distribution network power quality'
variations monitoring. Power quality (PO) has become a significant issue for both power
suppliers and customers. There have been important changes in power system regarding to
power quality requirements. "Power quality" is the combination at voltage quality and current
quality. The main research problem of the project is to investigate the power quality of a
distribution network by selection of proper measurement, applying and developing the
existing classic and modern signal conditioning methods for power disturbance's parameters
extracting and monitoring. The research objectives are:
To study the standard lEC 61000-4-30 requirements. to investigate the common
couplings in the distribution network.
To identity the points for measurement, to develop MySQL database for the data from
the measurement and to develop MATLAB software tor simulation of the network
To develop methods based on Fourier transforms for estimation of the parameters of
the disturbances.
To develop software for the methods implementation,
The influence of different loads on power quality disturbances are considered in the
distribution network. Points on the network and meters according to the lEC power quality
standards are investigated and applied for the CPUT Bellville campus distribution network.
The implementation of the power quality monitoring for the CPUT Bellville campus helps the
quality of power supply to be improved and the used power to be reduced.
MATLAB programs to communicate with the database and calculate the disturbances and
power quality parameters are developed.
Subjects/Keywords: Electric network analysis;
Electric networks;
Automated data collection systems;
Electric power distribution;
Electric power failures;
Electric power system stability – Data processing;
Electric power systems – Quality control;
Electric utilities – Cape Peninsula University of Technology;
Power systems harmonics;
MATLAB
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Nduku, N. P. (2009). Development of methods for distribution network power quality variation monitoring
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1144
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Nduku, Nyaniso Prudent. “Development of methods for distribution network power quality variation monitoring
.” 2009. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1144.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Nduku, Nyaniso Prudent. “Development of methods for distribution network power quality variation monitoring
.” 2009. Web. 02 Mar 2021.
Vancouver:
Nduku NP. Development of methods for distribution network power quality variation monitoring
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2009. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1144.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Nduku NP. Development of methods for distribution network power quality variation monitoring
. [Thesis]. Cape Peninsula University of Technology; 2009. Available from: http://etd.cput.ac.za/handle/20.500.11838/1144
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
28.
Bredekamp, Albertus Johannes.
Measurement methodology investigating home entertainment consoles and comparison against energy star and harmonic standards
.
Degree: 2012, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1148
► People are spending more time being entertained at home now than ever before. It is currently common to find a home entertainment console containing an…
(more)
▼ People are spending more time being entertained at home now than ever before. It is currently common to find a home entertainment console containing an LCD or Plasma television, DVD player and surround sound amplifier in many homes. The number of home entertainment devices is increasing, yet our understanding of the effect that they have on power quality is incomplete. This study determines the power consumption of home entertainment equipment as well as the effect that such devices have on harmonic distortion levels.
A methodology is developed for the measurement of the power consumption of home entertainment equipment including television sets, DVD players and home theatre. The results are compared to the Energy Star standard to determine if the power consumption of these devices is within the limits imposed. The methodology presented consists of three parts, performing measurements, generating results and comparison to energy and harmonic standards.
The developed methodology includes steps for mathematically combining the measured voltage and current waveforms of individual devices. The goal is to determine total current and voltage waveforms for a combination of devices. The methodology also describes how to analyze the resultant synthesized waveforms so as to determine the power consumption at each harmonic.
The levels of current harmonics for individual devices and groups of devices are determined and then compared to the EN6100-3-2 standard to ascertain if they are within the limits imposed. The power consumption and current harmonics of each combination as well as individual devices were analysed. Using the developed methodology, four case studies were conducted, grouping different home entertainment devices together.
It was found that the power consumption of LCD television sets are below the limits imposed by the Energy Star standard while for Plasma based televisions it was above these limits. Current harmonic levels for CRT based televisions were found to be above the limits imposed by the EN6100-3-2 standard while those for LCD and Plasma based televisions the levels were below the limits.
The research concludes that the current harmonics of new LCD and Plasma based televisions does not pose any concern for power quality.
Subjects/Keywords: Audio-visual equipment – Energy consumption;
Electric switchgear – Standards;
Electric switchgear – Testing;
Dissertations, Academic;
MTech;
Theses, dissertations, etc.
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Bredekamp, A. J. (2012). Measurement methodology investigating home entertainment consoles and comparison against energy star and harmonic standards
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1148
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bredekamp, Albertus Johannes. “Measurement methodology investigating home entertainment consoles and comparison against energy star and harmonic standards
.” 2012. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1148.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bredekamp, Albertus Johannes. “Measurement methodology investigating home entertainment consoles and comparison against energy star and harmonic standards
.” 2012. Web. 02 Mar 2021.
Vancouver:
Bredekamp AJ. Measurement methodology investigating home entertainment consoles and comparison against energy star and harmonic standards
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2012. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1148.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bredekamp AJ. Measurement methodology investigating home entertainment consoles and comparison against energy star and harmonic standards
. [Thesis]. Cape Peninsula University of Technology; 2012. Available from: http://etd.cput.ac.za/handle/20.500.11838/1148
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
29.
Mutch, Gavin Alexander.
An analogue controlled switch-mode power system for a CubeSat
.
Degree: 2013, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1161
► The power system is essentially one of the most critical subsystems to any satellite, without some form of power system a satellite would simply cease…
(more)
▼ The power system is essentially one of the most critical subsystems to any satellite, without
some form of power system a satellite would simply cease to function. The research within these
pages investigates the areas pertaining to satellite power systems with the main focus towards
the CubeSat platform. The end objective of this research was the development of a reliable
analogue based switch-mode power system for a CubeSat.
The research began with an investigation into the CubeSat platform, the space environment
and a basic overview of a satellite and its systems. The research then focussed on satellite
power systems, focussing primarily on satellite power system topologies and switch-mode
power systems. Various components and concepts surrounding the satellite power system were
investigate and included the photovoltaic (PV) solar cell, batteries, satellite power system
topologies, protection concepts and typical CubeSat power systems. The nal part of the
literature review included research into typical CubeSat power systems.
The space environment complicates the design of satellite systems. The developed electrical
power system harnessed electrical power from a PV solar panel by means of a fractional opencircuit
voltage (FOCV) based maximum power point tracker (MPPT) with the use of a SEPIC
DC-DC converter. The use of a SEPIC DC-DC converter allowed the system to operate at a
greater e ciency than could be expected from linear designs. The requirement for an e cient
system was important as the heat generated by the power system could bring rise to dissipation
issues, resulting in over-heating of various components. The design took into account component
sizing, as larger components would be more prone to damage during the high accelerations and
vibrations associated with being launched into space. The use of a MPPT allowed the power
system to better utilise the available PV solar panel power, by maintaining the PV solar panel
near its optimum operating voltage. The design slid between MPPT and voltage regulation to
harness as much power as possible while not over-charging the Lithium polymer battery. The
power system consisted of battery under-voltage protection as well as over-current protection for
the attached payloads and satellite subsystems.
The SEPIC DC-DC converter was selected over other SMPS topologies, as this topology could
be used in a 1U and 3U CubeSat with a wide variety of PV solar panel cell con gurations. The
bene ts of this SMPS topology are due to the SEPIC DC-DC converter's ability to produce an
output voltage greater than, less than or equal to the input voltage (National Semiconductor,
2008; Texas Instruments, 2008a). This, along with the operation of the FOCV based MPPT,
allowed the power system to be very exible. The designed FOCV based MPPT could be pre-set to di ering PV solar cell technologies due to the adjustable ratio between the maximum power
point voltage, Vmpp, and the open-circuit voltage, Voc of the PV solar panel. It was decided not
to select a Buck or Boost DC-DC converter…
Subjects/Keywords: CubeSat power systems;
Satellite solar power stations;
Artificial satellites;
Electric power systems;
Photovoltaic power generation;
Dissertations, Academic;
MTech;
Theses, dissertations, etc.
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APA (6th Edition):
Mutch, G. A. (2013). An analogue controlled switch-mode power system for a CubeSat
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1161
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mutch, Gavin Alexander. “An analogue controlled switch-mode power system for a CubeSat
.” 2013. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1161.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mutch, Gavin Alexander. “An analogue controlled switch-mode power system for a CubeSat
.” 2013. Web. 02 Mar 2021.
Vancouver:
Mutch GA. An analogue controlled switch-mode power system for a CubeSat
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2013. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1161.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mutch GA. An analogue controlled switch-mode power system for a CubeSat
. [Thesis]. Cape Peninsula University of Technology; 2013. Available from: http://etd.cput.ac.za/handle/20.500.11838/1161
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
30.
Retonda-Modiya, John-Charly.
Development of an embedded system actuator node for intergration into an IEC 61850 based substation automation application
.
Degree: 2012, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1162
► The introduction of the IEC 61850 standard in substations for communication networks and systems by the International Electrotechnical Commission (IEC) in 2003 provided the possibility…
(more)
▼ The introduction of the IEC 61850 standard in substations for communication networks and
systems by the International Electrotechnical Commission (IEC) in 2003 provided the
possibility for communication between devices of different manufacturers. However, the
advent of this standard also brought about many challenges associated with it.
The challenges introduced by this fairly recent standard of communications in Substation
Automation Systems (SAS), and the need for the development of cost effective IEC 61850-
compliant devices, motivated the decision of the Centre for Substation and Energy
Management Systems within the Electrical Engineering Department of the Cape Peninsula
University of Technology to focus on the implementation of the IEC 61850 standard using an
embedded hardware platform.
The development of an IEC 61850 embedded application requires substantial knowledge in
multiple domains such as data networking, software modelling and development of Intelligent
Electronic Devices (IEDs), protection of the electrical system, system simulation and testing
methods, etc. Currently knowledge about the implementation of the IEC 61850 standard
usually resides with vendors and is not in the public domain.
The IEC 61850 standard allows for two groups of communication services between entities
within the substation automation system. One group utilizes a client-server model
accommodating services such as Reporting and Remote Switching. The second group
utilizes a peer-to-peer model for Generic Substation Event (GSE) services associated with
time-critical activities such as fast and reliable communication between Intelligent Electronic
Devices (IEDs) used for protection of the power network.
The messages associated with the GSE services are the Generic Object Oriented Substation
Event (GOOSE) messages. The use of GOOSE messages for protection of the electrical
system is very important in modern substations. Detailed knowledge of the structure of these
messages is important in instances requiring fault diagnosis to determine the cause of mal–
operation or to address interoperability concerns or when developing custom IEC 61850-
compliant devices with limited functionality.
A practical protection application (overcurrent) case study is presented where GOOSE
messages are exchanged between a commercial IED and an IEC 61850-compliant controller
based on an embedded platform. The basic data model and software development of an
actuator node for a circuit breaker is proposed using an IEC 61850 communication stack on
an embedded platform. The performance of the GOOSE messages is confirmed to be as per
the functional behaviour specified, and per the IEC 68150 standard in terms of the temporal
behaviour required.
This thesis document tables the methods, software programs, hardware interfacing and
system integration techniques that allow for the development and implementation of a low
cost IEC 61850-compliant controller unit on an embedded systems platform for the
substation automation system.
The overcurrent case study distributed…
Subjects/Keywords: International Electrotechnical Commission;
Electric power systems – Protection;
Electric power transmission;
Electric substation – Automation;
Actuators;
Software – Development;
IEC-61850;
Intelligent Electronic Devices (IEDs);
Generic Object Oriented Substation Event (GOOSE);
GOOSE messages;
Software modelling;
Communication stack;
Embedded systems;
Dissertations, Academic;
MTech;
Theses, dissertations, etc.
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Retonda-Modiya, J. (2012). Development of an embedded system actuator node for intergration into an IEC 61850 based substation automation application
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1162
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Retonda-Modiya, John-Charly. “Development of an embedded system actuator node for intergration into an IEC 61850 based substation automation application
.” 2012. Thesis, Cape Peninsula University of Technology. Accessed March 02, 2021.
http://etd.cput.ac.za/handle/20.500.11838/1162.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Retonda-Modiya, John-Charly. “Development of an embedded system actuator node for intergration into an IEC 61850 based substation automation application
.” 2012. Web. 02 Mar 2021.
Vancouver:
Retonda-Modiya J. Development of an embedded system actuator node for intergration into an IEC 61850 based substation automation application
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2012. [cited 2021 Mar 02].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1162.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Retonda-Modiya J. Development of an embedded system actuator node for intergration into an IEC 61850 based substation automation application
. [Thesis]. Cape Peninsula University of Technology; 2012. Available from: http://etd.cput.ac.za/handle/20.500.11838/1162
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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Open Access Theses and Dissertations