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University of Johannesburg
1.
Swart, Sarica Meyer.
Aspects of the ratio of reactive to real powers as input to transmission network control.
Degree: 2012, University of Johannesburg
URL: http://hdl.handle.net/10210/4838 
► D.Ing.
Transmission networks change continuously when new supply requests are made, network reinforcements are installed and equipment configuration changes. Therefore, network design, operation and control…
(more)
▼ D.Ing.
Transmission networks change continuously when new supply requests are made, network reinforcements are installed and equipment configuration changes. Therefore, network design, operation and control requirements change. To manage this, controllers are being developed to assist human network controllers who might not always be specialists in equipment operation and characteristics. A transmission network comprises multiple variables, some dependent on others. The resistive portion of a load (PLoad) and the total reactive power (Q) installed close to the load can be set in relation to each other. This relationship forms the basic concept of the QP ratio for a transmission network. This ratio is not standardly used as a variable in network operation or control. This thesis explores this new QP ratio in more depth for application in different networks. This concept is developed and investigated in detail and equations are derived from first principles. The usability of the QP ratio is described and calculations are done for existing networks. It is shown that each network has its own unique QP ratio that can be used as information for human operators or as part of a controller device. This information can assist in determining actions required to be taken by controllers and operators. This thesis investigates aspects related to the use of a QP ratio in transmission networks as far as system operation and network control is concerned. The information provided in this thesis could be developed further to assist in implementing of the QP ratio in transmission network control rooms or systems. This will contribute to the provision of more reliable, robust and controlled electrical networks.
Subjects/Keywords: Electric power transmission; Electric power system stability
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APA (6th Edition):
Swart, S. M. (2012). Aspects of the ratio of reactive to real powers as input to transmission network control. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/4838
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):
Swart, Sarica Meyer. “Aspects of the ratio of reactive to real powers as input to transmission network control.” 2012. Thesis, University of Johannesburg. Accessed January 19, 2021.
http://hdl.handle.net/10210/4838.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Swart, Sarica Meyer. “Aspects of the ratio of reactive to real powers as input to transmission network control.” 2012. Web. 19 Jan 2021.
Vancouver:
Swart SM. Aspects of the ratio of reactive to real powers as input to transmission network control. [Internet] [Thesis]. University of Johannesburg; 2012. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10210/4838.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Swart SM. Aspects of the ratio of reactive to real powers as input to transmission network control. [Thesis]. University of Johannesburg; 2012. Available from: http://hdl.handle.net/10210/4838
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Johannesburg
2.
Swart, Sarica Meyer.
Aspects of the ratio of reactive to real powers as input to transmission network control.
Degree: 2014, University of Johannesburg
URL: http://hdl.handle.net/10210/9483
► M.Ing. (Electrical Engineering)
Induction heating has been used in practice for many years. The main goal of this study is to investigate the use of…
(more)
▼ M.Ing. (Electrical Engineering)
Induction heating has been used in practice for many years. The main goal of this study is to investigate the use of a single-turn coil in a typical induction heater. The work starts off with a background study of elecrroheat and specifically high-frequency induction heating. Finite element simulations were conducted on different coil shapes and compared with each other. The converter. with control and driver circuits. used in the, experimental setup, as well as the experimental construction and results are described. The work is concluded with an evaluation of the project.
Subjects/Keywords: Electric power system stability; Electric power transmission
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APA (6th Edition):
Swart, S. M. (2014). Aspects of the ratio of reactive to real powers as input to transmission network control. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/9483
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):
Swart, Sarica Meyer. “Aspects of the ratio of reactive to real powers as input to transmission network control.” 2014. Thesis, University of Johannesburg. Accessed January 19, 2021.
http://hdl.handle.net/10210/9483.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Swart, Sarica Meyer. “Aspects of the ratio of reactive to real powers as input to transmission network control.” 2014. Web. 19 Jan 2021.
Vancouver:
Swart SM. Aspects of the ratio of reactive to real powers as input to transmission network control. [Internet] [Thesis]. University of Johannesburg; 2014. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10210/9483.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Swart SM. Aspects of the ratio of reactive to real powers as input to transmission network control. [Thesis]. University of Johannesburg; 2014. Available from: http://hdl.handle.net/10210/9483
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Nelson Mandela Metropolitan University
3.
Venter, Clement.
The effect of the van Staden wind farm on the power quality of the rural distribution network.
Degree: 2018, Nelson Mandela Metropolitan University
URL: http://hdl.handle.net/10948/36761
► Connection of wind farms to weak networks with a typically low X/R and short circuit ratio could result in a larger variation of voltage for…
(more)
▼ Connection of wind farms to weak networks with a typically low X/R and short circuit ratio could result in a larger variation of voltage for corresponding variation in wind farm generation output. This variation in voltage could negatively affect the quality of electrical power in the vicinity of the connected wind farm. The analysis was based on actual on-site measurement data at individual consumers’ point of supply and the effect of the Van Stadens Wind Farm integration as seen by the consumers can be determined. It was found through statistical and correlative analysis that the voltage quality measured at the test sites were not negatively affected by the presence of generation at the Metrowind Van Stadens Wind Farm. The voltage was found to be more negatively affected by the load current drawn by the consumer at the test site and that it is foremost when the loading current was higher. No definitive evidence of an increase in voltage harmonics due to generation output or loading current was found. At two sites it was however found that the 7th order harmonic is eliminated or reduced by an increase in the generation of the wind farm above approximately 20% of maximum output. Power Factory simulations, using the Quasi Dynamic simulation tool, was performed to validate the voltage findings of the on-site power quality measurements and two things were clear from the simulations. Firstly the voltage at the point of connection has a strong negative correlation with the consumer loading current and means that the voltage will usually decrease with an increase in the loading current and vice versa. Secondly, as with the analysis of the on-site measurement results, it can be said that when current is low, then the generation output of the wind farm will have a proportional effect on the voltage. From the findings of the on-site measurements it was concluded that the wind farm did not have a negative effect on the test site consumers in the vicinity and the Power factory simulations confirmed the conclusions on the voltage analysis. It was also concluded that the local consumer load current has a larger effect on the local measured voltage than the generation output of the wind farm.
Subjects/Keywords: Electric transformers; Wind power; Electric power production
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APA (6th Edition):
Venter, C. (2018). The effect of the van Staden wind farm on the power quality of the rural distribution network. (Thesis). Nelson Mandela Metropolitan University. Retrieved from http://hdl.handle.net/10948/36761
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):
Venter, Clement. “The effect of the van Staden wind farm on the power quality of the rural distribution network.” 2018. Thesis, Nelson Mandela Metropolitan University. Accessed January 19, 2021.
http://hdl.handle.net/10948/36761.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Venter, Clement. “The effect of the van Staden wind farm on the power quality of the rural distribution network.” 2018. Web. 19 Jan 2021.
Vancouver:
Venter C. The effect of the van Staden wind farm on the power quality of the rural distribution network. [Internet] [Thesis]. Nelson Mandela Metropolitan University; 2018. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10948/36761.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Venter C. The effect of the van Staden wind farm on the power quality of the rural distribution network. [Thesis]. Nelson Mandela Metropolitan University; 2018. Available from: http://hdl.handle.net/10948/36761
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
4.
Abd Elwahid, Sarra.
Hardware implementation of an automatic adaptive centralized under frequency load shedding.
Degree: 2013, University of Tennessee – Chattanooga
URL: https://scholar.utc.edu/theses/186
► Due to the shortcomings of the conventional Under Frequency Load Shedding UFLS, most researches develop an adaptive UFLS schemes. With the aid of new technology…
(more)
▼ Due to the shortcomings of the conventional Under Frequency Load Shedding UFLS, most researches develop an adaptive UFLS schemes. With the aid of new technology hardware that enables the implementation of Wide Area Monitoring Protection and Control (WAMPC)
application, this gives the opportunity for using industrial grade hardware to implement, evaluate these schemes and, therefore, to validate the recent research findings for industrial use.
This study implements a centralized adaptive UFLS algorithm using industry grade hardware such as Phasor Measurement Units (PMUs), Synchrophasor Vector Processor (SVP) that resembles real time system operation.
The study examines disturbance effects on the frequency at different disturbance
locations. Each time the algorithm decisions are able to restore system frequency to a safe level and improve voltage level at the load buses. Besides, the algorithm is able to distribute the amount of
power to be shed differently with the disturbance locations.
Advisors/Committee Members: Eltom, Ahmed H., Kobet, Gary, Ofoli, Abdul, College of Engineering and Computer Science.
Subjects/Keywords: Electric power systems; Electric power distribution
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APA ·
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APA (6th Edition):
Abd Elwahid, S. (2013). Hardware implementation of an automatic adaptive centralized under frequency load shedding. (Masters Thesis). University of Tennessee – Chattanooga. Retrieved from https://scholar.utc.edu/theses/186
Chicago Manual of Style (16th Edition):
Abd Elwahid, Sarra. “Hardware implementation of an automatic adaptive centralized under frequency load shedding.” 2013. Masters Thesis, University of Tennessee – Chattanooga. Accessed January 19, 2021.
https://scholar.utc.edu/theses/186.
MLA Handbook (7th Edition):
Abd Elwahid, Sarra. “Hardware implementation of an automatic adaptive centralized under frequency load shedding.” 2013. Web. 19 Jan 2021.
Vancouver:
Abd Elwahid S. Hardware implementation of an automatic adaptive centralized under frequency load shedding. [Internet] [Masters thesis]. University of Tennessee – Chattanooga; 2013. [cited 2021 Jan 19].
Available from: https://scholar.utc.edu/theses/186.
Council of Science Editors:
Abd Elwahid S. Hardware implementation of an automatic adaptive centralized under frequency load shedding. [Masters Thesis]. University of Tennessee – Chattanooga; 2013. Available from: https://scholar.utc.edu/theses/186
5.
Patterson, Russell William.
Analysis of two-stage shunt capacitor bank protection deficiencies with mitigation suggested.
Degree: 2013, University of Tennessee – Chattanooga
URL: https://scholar.utc.edu/theses/360
► A large utility was experiencing a problem when switching a two-stage capacitor bank resulting in misoperations of the bank protection. When the bypass switch is…
(more)
▼ A large
utility was experiencing a problem
when
switching
a
two-stage capacitor
bank
resulting
in misoperations of the bank protection. When the bypass switch is
opened a long duration dc offset occurs across all capacitors. This dc causes saturation of
the tap point VT resulting in a false differential voltage and misoperation of the
protection. The utility had to
disable
the
voltage differential
during switching until the
phenomenon could be studied and a suitable solution found.
The work is a comprehensive analysis
of the
transients
affecting the protection
and how the problem could be mitigated.
An analytical approach was taken to
understand the
occurrence of
the dc offset
and
an
Electromagnetics Transients Program (EMTP)
was used to study various
mitigation techniques.
A
simple solution
is presented for future
installations that
prevents
the problem completely. A “next best” mitigation
is presented for existing
banks
where
reconfiguration would not be cost justified.
Advisors/Committee Members: Eltom, Ahmed H., Sisworahardjo, Nurhidajat, Kobet, Gary L., College of Engineering and Computer Science.
Subjects/Keywords: Electric power systems; Electric power distribution
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APA ·
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Manager
APA (6th Edition):
Patterson, R. W. (2013). Analysis of two-stage shunt capacitor bank protection deficiencies with mitigation suggested. (Masters Thesis). University of Tennessee – Chattanooga. Retrieved from https://scholar.utc.edu/theses/360
Chicago Manual of Style (16th Edition):
Patterson, Russell William. “Analysis of two-stage shunt capacitor bank protection deficiencies with mitigation suggested.” 2013. Masters Thesis, University of Tennessee – Chattanooga. Accessed January 19, 2021.
https://scholar.utc.edu/theses/360.
MLA Handbook (7th Edition):
Patterson, Russell William. “Analysis of two-stage shunt capacitor bank protection deficiencies with mitigation suggested.” 2013. Web. 19 Jan 2021.
Vancouver:
Patterson RW. Analysis of two-stage shunt capacitor bank protection deficiencies with mitigation suggested. [Internet] [Masters thesis]. University of Tennessee – Chattanooga; 2013. [cited 2021 Jan 19].
Available from: https://scholar.utc.edu/theses/360.
Council of Science Editors:
Patterson RW. Analysis of two-stage shunt capacitor bank protection deficiencies with mitigation suggested. [Masters Thesis]. University of Tennessee – Chattanooga; 2013. Available from: https://scholar.utc.edu/theses/360
6.
Ahmed, Miyada.
An exiplicit damping sensitivity expression for power system stabilizers applications in power systems.
Degree: 2017, University of Tennessee – Chattanooga
URL: https://scholar.utc.edu/theses/519
► Interconnected power systems are subject to low frequency oscillations. These oscillations, if poorly damped, threaten the stability of the system and limit its power transfer…
(more)
▼ Interconnected
power systems are
subject to low frequency oscillations. These oscillations, if poorly damped, threaten the stability of the system and limit its
power transfer capability.
Power System Stabilizers (PSS) are widely used to enhance the damping of electromechanical oscillatory modes.
Conventional methods to tune
power system stabilizers attempt to provide the required magnitude/phase shift compensation through frequency response or mode sensitivity analysis. However, these methods do not operate directly on the damping sensitivity of the mode.
A novel method to calculate the damping sensitivity has been developed in this work. It operates on mode damping directly to achieve optimum damping for the under-damped oscillatory modes. The proposed method has been used to tune simple stabilizers for the well-known two-area four-machine
power system problem and the IEEE9-Bus system. It is compared with results obtained from complex and robust PSS designs, and found to offer comparable outcomes.
Advisors/Committee Members: Eltom, Ahmed H., Karrar, Abdelrahman A., Kobet, Gary L., College of Engineering and Computer Science.
Subjects/Keywords: Electric power systems; Electric power system stability
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APA ·
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Manager
APA (6th Edition):
Ahmed, M. (2017). An exiplicit damping sensitivity expression for power system stabilizers applications in power systems. (Masters Thesis). University of Tennessee – Chattanooga. Retrieved from https://scholar.utc.edu/theses/519
Chicago Manual of Style (16th Edition):
Ahmed, Miyada. “An exiplicit damping sensitivity expression for power system stabilizers applications in power systems.” 2017. Masters Thesis, University of Tennessee – Chattanooga. Accessed January 19, 2021.
https://scholar.utc.edu/theses/519.
MLA Handbook (7th Edition):
Ahmed, Miyada. “An exiplicit damping sensitivity expression for power system stabilizers applications in power systems.” 2017. Web. 19 Jan 2021.
Vancouver:
Ahmed M. An exiplicit damping sensitivity expression for power system stabilizers applications in power systems. [Internet] [Masters thesis]. University of Tennessee – Chattanooga; 2017. [cited 2021 Jan 19].
Available from: https://scholar.utc.edu/theses/519.
Council of Science Editors:
Ahmed M. An exiplicit damping sensitivity expression for power system stabilizers applications in power systems. [Masters Thesis]. University of Tennessee – Chattanooga; 2017. Available from: https://scholar.utc.edu/theses/519
7.
Lautigar, Mitch.
Automated transmission line fault analysis the SMT method.
Degree: 2019, University of Tennessee – Chattanooga
URL: https://scholar.utc.edu/theses/600
► Analyzing faults from transmission lines automatically using a computer is a complex, multi-step process that takes a literal understanding of how the computer reads the…
(more)
▼ Analyzing faults from transmission lines automatically using a computer is a complex, multi-step process that takes a literal understanding of how the computer reads the data. While there are many ways to approach this problem (e.g.. Inductance Calculation), the Square Mean Test method allows for quick, and efficient calculations of any files read in from Intelliruptors. These calculations are then grouped and classified together outside of this project to prioritize faults that need to be looked at.
Advisors/Committee Members: Karrar, Abdelrahman, Ahmed, Raga, Ofoli, Abdul R., Hay, Robert, College of Engineering and Computer Science.
Subjects/Keywords: Electric power systems; Electric power distribution
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APA ·
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Manager
APA (6th Edition):
Lautigar, M. (2019). Automated transmission line fault analysis the SMT method. (Masters Thesis). University of Tennessee – Chattanooga. Retrieved from https://scholar.utc.edu/theses/600
Chicago Manual of Style (16th Edition):
Lautigar, Mitch. “Automated transmission line fault analysis the SMT method.” 2019. Masters Thesis, University of Tennessee – Chattanooga. Accessed January 19, 2021.
https://scholar.utc.edu/theses/600.
MLA Handbook (7th Edition):
Lautigar, Mitch. “Automated transmission line fault analysis the SMT method.” 2019. Web. 19 Jan 2021.
Vancouver:
Lautigar M. Automated transmission line fault analysis the SMT method. [Internet] [Masters thesis]. University of Tennessee – Chattanooga; 2019. [cited 2021 Jan 19].
Available from: https://scholar.utc.edu/theses/600.
Council of Science Editors:
Lautigar M. Automated transmission line fault analysis the SMT method. [Masters Thesis]. University of Tennessee – Chattanooga; 2019. Available from: https://scholar.utc.edu/theses/600
8.
Manandhar, Sudip.
Reliability assessment of smart distribution system and analysis of automatic line switches.
Degree: 2013, University of Tennessee – Chattanooga
URL: https://scholar.utc.edu/theses/331
► Electric Power reliability is a major concern of any utility company. Although the distribution system is getting advanced, reliable energy at a cheaper cost is…
(more)
▼ Electric Power reliability is a major concern of any utility company. Although the
distribution system is getting advanced, reliable energy at a cheaper cost is still a big concern.
Power utility companies are trying to provide reliable energy through many
possible ways. One
of the possible solutions is use of automatic switches.
Power utility companies are using automatic switch called IntelliRupter®
for automatic
fault detection, isolation and service restoration. It has been the biggest achievement in
improving reliability so far. However, such automation is very costly. It needs proper planning
for installation of such devices so that the utility company can make the most benefit at optimal
cost.
The main objective of the study is to compute reliability of the distribution system using
Failure Mode and Effect Analysis method. Also, it presents step by step economic analysis to
determine optimum number and location of automatic switch fulfilling reliability and economic
constraints.
Advisors/Committee Members: Sisworahardjo, Nurhidajat, Eltom, Ahmed H., Ofoli, Abjul, College of Engineering and Computer Science.
Subjects/Keywords: Electric power systems; Electric power distribution
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APA ·
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APA (6th Edition):
Manandhar, S. (2013). Reliability assessment of smart distribution system and analysis of automatic line switches. (Masters Thesis). University of Tennessee – Chattanooga. Retrieved from https://scholar.utc.edu/theses/331
Chicago Manual of Style (16th Edition):
Manandhar, Sudip. “Reliability assessment of smart distribution system and analysis of automatic line switches.” 2013. Masters Thesis, University of Tennessee – Chattanooga. Accessed January 19, 2021.
https://scholar.utc.edu/theses/331.
MLA Handbook (7th Edition):
Manandhar, Sudip. “Reliability assessment of smart distribution system and analysis of automatic line switches.” 2013. Web. 19 Jan 2021.
Vancouver:
Manandhar S. Reliability assessment of smart distribution system and analysis of automatic line switches. [Internet] [Masters thesis]. University of Tennessee – Chattanooga; 2013. [cited 2021 Jan 19].
Available from: https://scholar.utc.edu/theses/331.
Council of Science Editors:
Manandhar S. Reliability assessment of smart distribution system and analysis of automatic line switches. [Masters Thesis]. University of Tennessee – Chattanooga; 2013. Available from: https://scholar.utc.edu/theses/331
9.
Goff, Cassandra Ha.
Fast bus protection using iec 61850.
Degree: 2013, University of Tennessee – Chattanooga
URL: https://scholar.utc.edu/theses/277
► International Electrotechnical Commission (IEC) 61850 is the latest technology that allows electric power utilities to build low cost digital substations. Because limited objective information is…
(more)
▼ International Electrotechnical Commission (IEC) 61850 is the latest technology that
allows
electric power utilities to build low cost
digital substations.
Because limited objective
information is available,
electric power utilities desire independent evaluations of IEC 61850
from end users.
The objective of this study was to compare the IEC 61850 method to the hardwired
method to find an optimal solution for the fast
bus protection scheme.
System disturbance
clearing time, engineering and construction costs, and interoperability between multivendor
microprocessor-based relays were used
as the criteria for the evaluation.
This research measured the protection speed of the hardwired method and the IEC 61850
method for the fast bus protection scheme, utilizing relays from the same and mixed
manufacturers. The results of the study show
that IEC 61850 method is simple, cost effective,
and offers speed of operation comparable to the hardwired method.
Advisors/Committee Members: Eltom, Ahmed H., Craven, Stephen D., Ofoli, Abdul, R., Kobet, Gary L., College of Engineering and Computer Science.
Subjects/Keywords: Electric power systems; Electric power distribution
Record Details
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Manager
APA (6th Edition):
Goff, C. H. (2013). Fast bus protection using iec 61850. (Masters Thesis). University of Tennessee – Chattanooga. Retrieved from https://scholar.utc.edu/theses/277
Chicago Manual of Style (16th Edition):
Goff, Cassandra Ha. “Fast bus protection using iec 61850.” 2013. Masters Thesis, University of Tennessee – Chattanooga. Accessed January 19, 2021.
https://scholar.utc.edu/theses/277.
MLA Handbook (7th Edition):
Goff, Cassandra Ha. “Fast bus protection using iec 61850.” 2013. Web. 19 Jan 2021.
Vancouver:
Goff CH. Fast bus protection using iec 61850. [Internet] [Masters thesis]. University of Tennessee – Chattanooga; 2013. [cited 2021 Jan 19].
Available from: https://scholar.utc.edu/theses/277.
Council of Science Editors:
Goff CH. Fast bus protection using iec 61850. [Masters Thesis]. University of Tennessee – Chattanooga; 2013. Available from: https://scholar.utc.edu/theses/277
10.
Mohammed, Enass.
Investigation of a new method for synchronous generator loss of excitation protection.
Degree: 2017, University of Tennessee – Chattanooga
URL: https://scholar.utc.edu/theses/520
► ABSTRACT Synchronous generator loss of field can compromise both generator and power grid stability and therefore must be quickly detected. In this thesis, a new…
(more)
▼ ABSTRACT
Synchronous generator loss of field can compromise both generator and
power grid stability and therefore must be quickly detected.
In this thesis, a new proposed method for LOF detection has been further explored and its shortcomings corrected.The detection index has been calculated based on these new modifications. The modifications include a more robust delta estimation technique and a removal of a required algorithm condition. Two methods are used to estimate the rotor angle and bothprovide a similar estimation. The first method depends on the integration of the rotor speed over time, while the second method is based on equations presented in a published paper.
Moreover, the algorithm was tested on both a 2-bus system and the IEEE 9-bus system to investigate the detection time, security and reliability of the proposed method.
The simulation model wasbuiltusing a Real Time Digital Simulator (RTDS) to simulate generator loss of excitation on a 2-bus and 9-bus system. The algorithm was then tested under various operating conditions (normal system conditions and disturbances). The advantages and drawbacks of the proposed algorithm are discussed in the thesis.
Advisors/Committee Members: Eltom, Ahmed H., Karrar, Abdelrahman A., Kobet, Gary L., College of Engineering and Computer Science.
Subjects/Keywords: Electric power systems; Electric power system stability
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APA ·
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MLA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mohammed, E. (2017). Investigation of a new method for synchronous generator loss of excitation protection. (Masters Thesis). University of Tennessee – Chattanooga. Retrieved from https://scholar.utc.edu/theses/520
Chicago Manual of Style (16th Edition):
Mohammed, Enass. “Investigation of a new method for synchronous generator loss of excitation protection.” 2017. Masters Thesis, University of Tennessee – Chattanooga. Accessed January 19, 2021.
https://scholar.utc.edu/theses/520.
MLA Handbook (7th Edition):
Mohammed, Enass. “Investigation of a new method for synchronous generator loss of excitation protection.” 2017. Web. 19 Jan 2021.
Vancouver:
Mohammed E. Investigation of a new method for synchronous generator loss of excitation protection. [Internet] [Masters thesis]. University of Tennessee – Chattanooga; 2017. [cited 2021 Jan 19].
Available from: https://scholar.utc.edu/theses/520.
Council of Science Editors:
Mohammed E. Investigation of a new method for synchronous generator loss of excitation protection. [Masters Thesis]. University of Tennessee – Chattanooga; 2017. Available from: https://scholar.utc.edu/theses/520
11.
Salah Aldeen Mohamed Zeyada, Mosab.
Adaptive underfrequency load shedding based on real time simulation.
Degree: 2014, University of Tennessee – Chattanooga
URL: https://scholar.utc.edu/theses/154
► Conventional Underfrequency Load Shedding (UFLS) is used to balance generation and load when underfrequency conditions occur. It sheds a fixed, predetermined amount of load irrespective…
(more)
▼ Conventional Underfrequency Load Shedding (UFLS) is used to balance generation and load when underfrequency conditions occur. It sheds a fixed, predetermined amount of load irrespective of disturbance location. Several adaptive UFLS schemes are proposed in the literature. Recent research discussed utilizing synchrophasor messages to implement adaptive UFLS but these studies have been using virtual PMUs. Of late, hardware implementations for adaptive UFLS scheme using actual Phasor Measurement Units (PMUs) are reported but also these studies are based on small
power systems. This study presents hardware implementation of adaptive UFLS based on real time simulation of IEEE39-bus system.
The simulation tool used was OPAL-RT eMEGAsim real time digital simulator. To emulate the actual environment where the scheme could be used, a complete phasor network setup is established using actual devices, such as high accuracy Global Positioning System (GPS) clocks, PMUs and Synchrophasor Vector Processor (SVP).
The results obtained show that the adaptive UFLS scheme restored the frequency and curtailed the load based on voltage sag. Furthermore, the results are compared with conventional UFLS scheme.
Advisors/Committee Members: Eltom, Ahmed H., Ofoli, Abdul, Kobet, Gary, College of Engineering and Computer Science.
Subjects/Keywords: Electric power distribution; Electric power systems
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APA (6th Edition):
Salah Aldeen Mohamed Zeyada, M. (2014). Adaptive underfrequency load shedding based on real time simulation. (Masters Thesis). University of Tennessee – Chattanooga. Retrieved from https://scholar.utc.edu/theses/154
Chicago Manual of Style (16th Edition):
Salah Aldeen Mohamed Zeyada, Mosab. “Adaptive underfrequency load shedding based on real time simulation.” 2014. Masters Thesis, University of Tennessee – Chattanooga. Accessed January 19, 2021.
https://scholar.utc.edu/theses/154.
MLA Handbook (7th Edition):
Salah Aldeen Mohamed Zeyada, Mosab. “Adaptive underfrequency load shedding based on real time simulation.” 2014. Web. 19 Jan 2021.
Vancouver:
Salah Aldeen Mohamed Zeyada M. Adaptive underfrequency load shedding based on real time simulation. [Internet] [Masters thesis]. University of Tennessee – Chattanooga; 2014. [cited 2021 Jan 19].
Available from: https://scholar.utc.edu/theses/154.
Council of Science Editors:
Salah Aldeen Mohamed Zeyada M. Adaptive underfrequency load shedding based on real time simulation. [Masters Thesis]. University of Tennessee – Chattanooga; 2014. Available from: https://scholar.utc.edu/theses/154
12.
Alverson, Mugdha.
Relay coordination with multiple breaker-in/breaker-out stations on the transmission line.
Degree: 2019, University of Tennessee – Chattanooga
URL: https://scholar.utc.edu/theses/592
► The main purpose of power system protection is to remove faults from the system as soon as possible so minimum damage happens to the transmission…
(more)
▼ The main purpose of
power system protection is to remove faults from the system as soon as possible so minimum damage happens to the transmission line or other equipment connected to the line. Tennessee Valley Authority (TVA) planners want to add multiple breaker-in/breaker-out stations on a two terminal transmission lines to reduce the number of Customer Connection Point Interruption (CCPI). This paper discusses the difficulty of setting up the zone distance relays and overcurrent relays when multiple breaker-in/breaker-out stations are added on the transmission line. It explains how many breakers can safely be added without compromising the zone 2 time delay of 50 cycles (limit imposed by TVA), how to set distance relay for phase faults and instantaneous overcurrent as well as time overcurrent relay for ground fault. It makes recommendation for not placing the breaker-in/breaker-out stations at a certain distance on transmission line and also talks about the maximum line loadability according to NERC standard PRC-023 when zone 2 of the distance element is set higher than 130%.
Advisors/Committee Members: Kobet, Gary L., Eltom, Ahmed H., Karrar, Abdelrahman, College of Engineering and Computer Science.
Subjects/Keywords: Electric power systems; Electric power distribution
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APA (6th Edition):
Alverson, M. (2019). Relay coordination with multiple breaker-in/breaker-out stations on the transmission line. (Masters Thesis). University of Tennessee – Chattanooga. Retrieved from https://scholar.utc.edu/theses/592
Chicago Manual of Style (16th Edition):
Alverson, Mugdha. “Relay coordination with multiple breaker-in/breaker-out stations on the transmission line.” 2019. Masters Thesis, University of Tennessee – Chattanooga. Accessed January 19, 2021.
https://scholar.utc.edu/theses/592.
MLA Handbook (7th Edition):
Alverson, Mugdha. “Relay coordination with multiple breaker-in/breaker-out stations on the transmission line.” 2019. Web. 19 Jan 2021.
Vancouver:
Alverson M. Relay coordination with multiple breaker-in/breaker-out stations on the transmission line. [Internet] [Masters thesis]. University of Tennessee – Chattanooga; 2019. [cited 2021 Jan 19].
Available from: https://scholar.utc.edu/theses/592.
Council of Science Editors:
Alverson M. Relay coordination with multiple breaker-in/breaker-out stations on the transmission line. [Masters Thesis]. University of Tennessee – Chattanooga; 2019. Available from: https://scholar.utc.edu/theses/592
Nelson Mandela Metropolitan University
13.
Pantshwa, Athini.
Analysis of the reliability for the 132/66/22 KV distribution network within Eskom’s Eastern Cape operating unit.
Degree: 2018, Nelson Mandela Metropolitan University
URL: http://hdl.handle.net/10948/34722
► A stable and reliable electrical power supply system is an inevitable pre-requisite for the technological and economic growth of any nation. Due to this, utilities…
(more)
▼ A stable and reliable electrical power supply system is an inevitable pre-requisite for the technological and economic growth of any nation. Due to this, utilities must strive and ensure that the customer’s reliability requirements are met and that the regulators requirements are satisfied at the lowest possible cost. It is known fact around the world that 90% of the customer service interruptions are caused due to failure in distribution system. Therefore, it is worth considering reliability assessments as it provides an opportunity to incorporate the cost or losses incurred by the utilities customer because of power failure. This must be considered in the planning and operating practices. The system modelling and simulation study is carried out on one of the district’s distribution system which consists of 132 kV, 66 kV and 22 kV network in Aliwal North Sector ECOU. The reliability assessment is done on the 22, 66 and 132 kV system to assess the performance of the present system and predictive reliability analysis for the future system considering load growth and system expansion. The alternative which gives low SAIDI, SAIFI and minimum breakeven costs is being assessed and considered. The reliability of 132 kV system could be further improved by constructing a new 132 kV line from a different source of supply and connecting with line coming from another district (reserve) at reasonable break-even cost. The decision base could be further improved by having Aliwal North Sector context interruption cost. However, the historical data which may be used in Aliwal North Sector to acquire interruption costs from the customers are being proposed. The focus should be on improving the power quality on constrained networks first, then the reliability. Therefore, for the Aliwal North power system network it is imperative that Eskom invest on the reliability of this network. This dissertation also analysed load reflected economic benefit versus performance expectations that should be optimized through achieving a balance between network performance (SAIDI) improvement, and total life cycle cost (to Eskom as well as the economy). Reliability analysis conducted in this dissertation used Aliwal North power system network as a case study; the results proved that the system is vulnerable to faults, planned and unplanned outages. Reliability evaluation studies were conducted on the system using DigSilent software in conjunction with FME. These two models gave accurate results with acceptable variance in most indices except for the ENS where the variance was quite significant. It can be concluded that DigSilent results are the most accurate results in all three reliability evaluation scenarios for the Aliwal North Power System, best interpretation being that of DigSilent.
Subjects/Keywords: Electric power transmission – Reliability; Electric power distribution; Electric power; Electric power systems
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APA (6th Edition):
Pantshwa, A. (2018). Analysis of the reliability for the 132/66/22 KV distribution network within Eskom’s Eastern Cape operating unit. (Thesis). Nelson Mandela Metropolitan University. Retrieved from http://hdl.handle.net/10948/34722
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):
Pantshwa, Athini. “Analysis of the reliability for the 132/66/22 KV distribution network within Eskom’s Eastern Cape operating unit.” 2018. Thesis, Nelson Mandela Metropolitan University. Accessed January 19, 2021.
http://hdl.handle.net/10948/34722.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Pantshwa, Athini. “Analysis of the reliability for the 132/66/22 KV distribution network within Eskom’s Eastern Cape operating unit.” 2018. Web. 19 Jan 2021.
Vancouver:
Pantshwa A. Analysis of the reliability for the 132/66/22 KV distribution network within Eskom’s Eastern Cape operating unit. [Internet] [Thesis]. Nelson Mandela Metropolitan University; 2018. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10948/34722.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Pantshwa A. Analysis of the reliability for the 132/66/22 KV distribution network within Eskom’s Eastern Cape operating unit. [Thesis]. Nelson Mandela Metropolitan University; 2018. Available from: http://hdl.handle.net/10948/34722
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
14.
Elballa, Wafa E.
A novel optimization formulation for the direct computation of the voltage collapse point.
Degree: 2017, University of Tennessee – Chattanooga
URL: https://scholar.utc.edu/theses/518
► The knowledge of the critical loading point of a power system is essential to assess its voltage stability condition. This point is traditionally obtained through…
(more)
▼ The knowledge of the critical loading point of a
power system is essential to assess its voltage stability condition. This point is traditionally obtained through continuation
power flows which are relatively accurate but requires a considerable amount of processing time.
In this work, the search for the critical loading point of a certain
power system is formulated as a constrained optimization problem which is solved using a robust scheme known as the Dog-leg Trust Region. This technique is mainly characterized by its reliability and fast convergence as it makes advantage of the merits of classical optimization techniques and gets rid of their limitations.
The proposed method was examined on several test systems namely the IEEE14, IEEE39, IEEE57, and IEEE118-bus systems. Besides successfully identifying the maximum loading point of these systems the algorithm achieved a considerable saving in processing time when compared to the continuation
power flow analysis of PSAT.
Advisors/Committee Members: Eltom, Ahmed H., Karrar, Abdelrahman A., Kobet, Gary L., College of Engineering and Computer Science.
Subjects/Keywords: Electric power distribution
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APA ·
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APA (6th Edition):
Elballa, W. E. (2017). A novel optimization formulation for the direct computation of the voltage collapse point. (Masters Thesis). University of Tennessee – Chattanooga. Retrieved from https://scholar.utc.edu/theses/518
Chicago Manual of Style (16th Edition):
Elballa, Wafa E. “A novel optimization formulation for the direct computation of the voltage collapse point.” 2017. Masters Thesis, University of Tennessee – Chattanooga. Accessed January 19, 2021.
https://scholar.utc.edu/theses/518.
MLA Handbook (7th Edition):
Elballa, Wafa E. “A novel optimization formulation for the direct computation of the voltage collapse point.” 2017. Web. 19 Jan 2021.
Vancouver:
Elballa WE. A novel optimization formulation for the direct computation of the voltage collapse point. [Internet] [Masters thesis]. University of Tennessee – Chattanooga; 2017. [cited 2021 Jan 19].
Available from: https://scholar.utc.edu/theses/518.
Council of Science Editors:
Elballa WE. A novel optimization formulation for the direct computation of the voltage collapse point. [Masters Thesis]. University of Tennessee – Chattanooga; 2017. Available from: https://scholar.utc.edu/theses/518
University of Johannesburg
15.
Kasemuana Matototo, Seraphin.
A comprehensive study of power system harmonics.
Degree: 2014, University of Johannesburg
URL: http://hdl.handle.net/10210/10309
► M.Tech. (Electrical and Electronic Engineering)
With the increasing use of nonlinear loads in power systems, harmonic pollution becomes more frequent with disastrous consequences on the…
(more)
▼ M.Tech. (Electrical and Electronic Engineering)
With the increasing use of nonlinear loads in power systems, harmonic pollution becomes more frequent with disastrous consequences on the electrical network and other loads. Harmonic currents cause problems such as system resonance, protective relays and switchgear malfunction, communication interference, incorrect meter, equipment and process failure, over heating of transmission and distribution systems, insulation degradation and power transformer failure. It appears therefore absolutely essential to determine the current profile of the loads connected to the same Point of Common Coupling (PCC). This study aims to assess a distorted power system in order to determine the characteristics components of distorted waveforms (DC components, fundamental and harmonics components), and to quantify the respective distortion contributions in the power network. The numerical method is applied to analyse the current waveforms captured with the aid of the digital scope meter (DSO) 1200 series at different sections of the network. The power network under study is designed, constructed and analysed with the MatLab/Simulink 7.0 package. In both methods, the Individual Harmonic Distortion (IHD) and the current total harmonic distortion (ITHD) for the line, the non-linear and linear loads are computed for the harmonic components 5th, 7th, 11th and 13th. The results showed that for the analysis of the power system, numerical analysis based on the resultant harmonic curve method and the MatLab/Simulink as applied to the network all converged to highlight that harmonic components appear both on the line, the PCC and the linear load. This is due to the fact that the converter characteristic harmonics (5th, 7th, 11th, 13th…) are found in the network components (line, PCC, linear load…). The resultant harmonic curve method indicated a randomly distributed percentage IHD in different sections of the network for harmonic orders higher than 7th, whereas the Matlab/Simulink results normally show a non-uniform decay pattern of the IHD as the harmonic order increases within the respective section of the network.
Subjects/Keywords: Electric power systems; Harmonics (Electric waves); Electric power distribution; Electric networks
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APA (6th Edition):
Kasemuana Matototo, S. (2014). A comprehensive study of power system harmonics. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/10309
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):
Kasemuana Matototo, Seraphin. “A comprehensive study of power system harmonics.” 2014. Thesis, University of Johannesburg. Accessed January 19, 2021.
http://hdl.handle.net/10210/10309.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kasemuana Matototo, Seraphin. “A comprehensive study of power system harmonics.” 2014. Web. 19 Jan 2021.
Vancouver:
Kasemuana Matototo S. A comprehensive study of power system harmonics. [Internet] [Thesis]. University of Johannesburg; 2014. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10210/10309.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kasemuana Matototo S. A comprehensive study of power system harmonics. [Thesis]. University of Johannesburg; 2014. Available from: http://hdl.handle.net/10210/10309
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.
Mthunzi, Everett Mondliwethu.
Performance analysis of a protection scheme based on P-class synchrophasor measurements
.
Degree: 2016, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/2378
► Power grid and system protection advancement greatly depend on technological advances. Advent technologies like digital microprocessor type protective relays facilitate paradigm shifts, providing inimitable beneficial…
(more)
▼ Power grid and system protection advancement greatly depend on technological advances. Advent technologies like digital microprocessor type protective relays facilitate paradigm shifts, providing inimitable beneficial engineering adaptations. Phasor measuring technology provides one such technological advance. The onset and rapid development of the Phasor Measuring Unit (PMU) provides an excellent platform for phasor-based, power system engineering.
Power transmission constitutes a critical section in the electric power system. The power system transmission lines are susceptible to faults which require instant isolation to establish and maintain consistent system stability. This research focuses on the study of transmission line protection based on P-Class synchrophasor measurements. The IEEE C37.238-2011 Precision Time Protocol (PTP) paradigm shift facilitates practical application of synchrophasors in protection schemes. Synchrophasor procession and accurate data alignment over wide areas support the hypothesis of a phasor-based transmission line differential protection. This research aims to directly implement P-Class synchrophasors in transmission line differential protection, employing synchrophasors to determine fault conditions and administer corresponding protective actions in wide area transmission lines. The research also aims to evaluate the operational characteristics of the synchrophasor-based transmission line differential protection scheme.
The research deliverables include a laboratory scale Test-bench that implements the PMU-based transmission line differential protection scheme, and a differential protection utility software solution that follows guidelines specified by the C37.118-2011 standard for synchrophasors.
The findings stand to evaluate performance of the PMU-based line differential protection scheme, verifying the protection model as an alternate, practical and feasible backup protection solution. The research deliverables include a synchrophasor-based current differential algorithm, software utility for implementing the PMU-based protection scheme and a Test-bench for concept and feasibility validation.
Subjects/Keywords: Electric power transmission;
Electric power systems – Measurement;
Electric lines – Protection;
Electric power systems – Standards
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Manager
APA (6th Edition):
Mthunzi, E. M. (2016). Performance analysis of a protection scheme based on P-class synchrophasor measurements
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/2378
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):
Mthunzi, Everett Mondliwethu. “Performance analysis of a protection scheme based on P-class synchrophasor measurements
.” 2016. Thesis, Cape Peninsula University of Technology. Accessed January 19, 2021.
http://etd.cput.ac.za/handle/20.500.11838/2378.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mthunzi, Everett Mondliwethu. “Performance analysis of a protection scheme based on P-class synchrophasor measurements
.” 2016. Web. 19 Jan 2021.
Vancouver:
Mthunzi EM. Performance analysis of a protection scheme based on P-class synchrophasor measurements
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2016. [cited 2021 Jan 19].
Available from: http://etd.cput.ac.za/handle/20.500.11838/2378.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mthunzi EM. Performance analysis of a protection scheme based on P-class synchrophasor measurements
. [Thesis]. Cape Peninsula University of Technology; 2016. Available from: http://etd.cput.ac.za/handle/20.500.11838/2378
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of KwaZulu-Natal
17.
Malapermal, Sanjian.
A methodology for optimal placement of distributed generation on meshed networks to reduce power losses for time variant loads.
Degree: 2015, University of KwaZulu-Natal
URL: http://hdl.handle.net/10413/16146
► In the 21st century, humanity’s thirst for an energy intensive lifestyle has led to the saturated expansion of the modern day power system. As the…
(more)
▼ In the 21st century, humanity’s thirst for an energy intensive lifestyle has led to the saturated expansion of the modern day
power system. As the
power system expands, centralised generation philosophies are rapidly being constrained due to increased technical losses. The inability to balance technical, economic and environmental conventional generation needs place further strain on the
power system. This constraint has catalysed the emergence of decentralized renewable energy sources. Distributed generation supplements the electrical needs of a rapidly expanding demand for energy and minimises the adverse environmental impact of fossil fuel
power stations.
Distributed Generation is defined as
electric power generation units connected close to load centres. Distributed generation can be classified according to rating, purpose, technology, environmental impact, mode of operation and penetration. Optimally connected distributed generation have many advantages over classically supplied
power systems. Such as reduced
power losses, improve voltage support and reliability to the system. Deferring network upgrades by relieving congestion and reducing greenhouse gas emission being some of the benefits of integrated distributed generation. This research delivers an optimal placement method of solar photovoltaic distributed generation on a 56 bus utility network to reduce
power losses. Critical electrical factors for optimal placement of distributed generation to reduce
power losses are defined. A practical loss optimization technique for optimal placement of distributed generation on meshed networks is defined. The technique follows an approach of ranking, profiling, activating, evaluating and finally selecting the optimally placed distributed resources. The importance of reactive
power compensation is examined when integrating distributed generation onto meshed networks. Pre and post distributed solar photovoltaic generation placement shows the worsening phase angles leading to poorer
power factors. The research demonstrates the impact of penetration and concentration of distributed generation on
power system losses. Highly concentrated placement of non-dispatched distributed generation units lead to increase in
power losses.
Results conclude that the placement of distributed generation for loss reduction on a meshed
power system is optimally located to match load-profiled centres. This research is significant as
power utility engineers can now benefit from a wider range of skills to assess the impact of DG connections.
Advisors/Committee Members: Davidson, Innocent Ewean. (advisor), Bello, Mashood Mobolaji. (advisor).
Subjects/Keywords: Electric power systems Electric losses.; Electric networks, Active.; Electric power distribution.; Photovoltaic power generation.; Theses Electric power and energy systems.; UCTD
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Manager
APA (6th Edition):
Malapermal, S. (2015). A methodology for optimal placement of distributed generation on meshed networks to reduce power losses for time variant loads. (Thesis). University of KwaZulu-Natal. Retrieved from http://hdl.handle.net/10413/16146
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):
Malapermal, Sanjian. “A methodology for optimal placement of distributed generation on meshed networks to reduce power losses for time variant loads.” 2015. Thesis, University of KwaZulu-Natal. Accessed January 19, 2021.
http://hdl.handle.net/10413/16146.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Malapermal, Sanjian. “A methodology for optimal placement of distributed generation on meshed networks to reduce power losses for time variant loads.” 2015. Web. 19 Jan 2021.
Vancouver:
Malapermal S. A methodology for optimal placement of distributed generation on meshed networks to reduce power losses for time variant loads. [Internet] [Thesis]. University of KwaZulu-Natal; 2015. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10413/16146.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Malapermal S. A methodology for optimal placement of distributed generation on meshed networks to reduce power losses for time variant loads. [Thesis]. University of KwaZulu-Natal; 2015. Available from: http://hdl.handle.net/10413/16146
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Columbia University
18.
Lundberg, Emily Elizabeth.
Power Switch: The Electric Power Research Institute and The Pendular Political Economy of American Power.
Degree: 2016, Columbia University
URL: https://doi.org/10.7916/D8K35TKS
► My dissertation tells the history of the Electric Power Research Institute (EPRI), the U.S. electric utility industry’s collective technology organization, founded at the onset of…
(more)
▼ My dissertation tells the history of the Electric Power Research Institute (EPRI), the U.S. electric utility industry’s collective technology organization, founded at the onset of the successive “Energy Crises” of the 1970s. The narrative tells a history of EPRI in three registers: the organization, the people, and the ideas. It tracks the internal politics of the industry’s research and development arm through each of its five sectors—nuclear generation, fossil fuel generation, environment and safety, end use, and transmission and distribution. Each sector was buffeted by EPRI’s management history, what one EPRI career project manager dubbed, “Peace, a Civil War, and the Great Depression.” Embedded in each of these sector histories is story of the incremental shift from one regulatory regime, a “natural monopoly,” to an as-of-yet unrealized regime, the “self-regulated network.” When deregulation was imminent in the mid-1990s, utility executives decided that collaboration and competition were at odds. EPRI funding plummeted by half. Instead of making it to the aspired destination at the “self-regulated electricity network,” American power got stuck in an impasse I call, with irony, the “networked grid.” The “networked grid” is a rigid grid with information and communication technology laid on top so as to achieve the illusion of economic efficiency at the cost of reliability, security, sustainability, and physical efficiency.
Subjects/Keywords: Electric utilities; Electric power; Communication; Electric Power Research Institute
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Manager
APA (6th Edition):
Lundberg, E. E. (2016). Power Switch: The Electric Power Research Institute and The Pendular Political Economy of American Power. (Doctoral Dissertation). Columbia University. Retrieved from https://doi.org/10.7916/D8K35TKS
Chicago Manual of Style (16th Edition):
Lundberg, Emily Elizabeth. “Power Switch: The Electric Power Research Institute and The Pendular Political Economy of American Power.” 2016. Doctoral Dissertation, Columbia University. Accessed January 19, 2021.
https://doi.org/10.7916/D8K35TKS.
MLA Handbook (7th Edition):
Lundberg, Emily Elizabeth. “Power Switch: The Electric Power Research Institute and The Pendular Political Economy of American Power.” 2016. Web. 19 Jan 2021.
Vancouver:
Lundberg EE. Power Switch: The Electric Power Research Institute and The Pendular Political Economy of American Power. [Internet] [Doctoral dissertation]. Columbia University; 2016. [cited 2021 Jan 19].
Available from: https://doi.org/10.7916/D8K35TKS.
Council of Science Editors:
Lundberg EE. Power Switch: The Electric Power Research Institute and The Pendular Political Economy of American Power. [Doctoral Dissertation]. Columbia University; 2016. Available from: https://doi.org/10.7916/D8K35TKS
19.
Wilson, Aaron.
A hierarchical approach to automated identification of anomalous electrical waveforms.
Degree: 2019, University of Tennessee – Chattanooga
URL: https://scholar.utc.edu/theses/596
► Power utilities employ "smart'' field devices capable of digitally recording electrical waveforms. The relationship between events and their recorded waveforms can be exploited for characterization…
(more)
▼ Power utilities employ "smart'' field devices capable of digitally recording electrical waveforms. The relationship between events and their recorded waveforms can be exploited for characterization of the
power grid’s state over any period of time and facilitating the impact electrical disturbances have on equipment, subsystems, and systems. Over a period of one month, these devices record approximately 2,000 electrical disturbance waveforms. Currently, analysis of these waveforms is conducted using by-hand approaches; thus, severely limiting the analysis to roughly 2%. The analysis is done hours to days after the events occurred, which negates informed, timely corrective actions. This document presents an automated hierarchical approach capable of identifying specific events using the electrical disturbance waveforms stored using COMmon format for TRAnsient Data Exchange (COMTRADE) files. The developed approach processes a single file in 1.8 seconds and has demonstrated successful identification of 140 events with a success rate of 91%.
Advisors/Committee Members: Reising, Donald R., Loveless, Thomas D., Karrar, Abdelrahman A., Hay, Robert W., College of Engineering and Computer Science.
Subjects/Keywords: Electric circuit analysis; Electric power systems; Electric power distribution
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APA (6th Edition):
Wilson, A. (2019). A hierarchical approach to automated identification of anomalous electrical waveforms. (Masters Thesis). University of Tennessee – Chattanooga. Retrieved from https://scholar.utc.edu/theses/596
Chicago Manual of Style (16th Edition):
Wilson, Aaron. “A hierarchical approach to automated identification of anomalous electrical waveforms.” 2019. Masters Thesis, University of Tennessee – Chattanooga. Accessed January 19, 2021.
https://scholar.utc.edu/theses/596.
MLA Handbook (7th Edition):
Wilson, Aaron. “A hierarchical approach to automated identification of anomalous electrical waveforms.” 2019. Web. 19 Jan 2021.
Vancouver:
Wilson A. A hierarchical approach to automated identification of anomalous electrical waveforms. [Internet] [Masters thesis]. University of Tennessee – Chattanooga; 2019. [cited 2021 Jan 19].
Available from: https://scholar.utc.edu/theses/596.
Council of Science Editors:
Wilson A. A hierarchical approach to automated identification of anomalous electrical waveforms. [Masters Thesis]. University of Tennessee – Chattanooga; 2019. Available from: https://scholar.utc.edu/theses/596
Ryerson University
20.
Wander, Inderpreet Singh.
Modeling of Synchronous Generator and Full-scale Converter for Distribution System Load Flow Analysis.
Degree: 2011, Ryerson University
URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A1386
► Environmental awareness and the need to reduce greenhouse gas emissions have promoted the use of green energy sources such as Wind Energy Conversion Systems (WECS).…
(more)
▼ Environmental awareness and the need to reduce greenhouse gas emissions have promoted the use of green energy sources such as Wind Energy Conversion Systems (WECS). The Type 4 Permanent Magnet Synchronous Generator (PMSG) with a Full-Scale Converter has grown to be a preferred choice among WECS. Conventionally these WECS are modeled as fixed PQ injections in distribution system analysis studies and for that reason they are not accurately represented. This inaccuracy is accentuated given the large-scale of integration of WECS. To overcome this limitation, this thesis proposes to develop a steady-state model for the Type 4 PMSG WECS to be used in unbalanced three-phase distribution load flow programs. The proposed model is derived from the analytical representation of its six main components: (1) the wind turbine, (2) the synchronous generator, (3) the diode-bridge rectifier, (4) voltage source inverter, (5) the dc-link with a boost converter that connects them, and (6) control mode action. This proposed model is validated through mathematical analysis and by comparing with a Matlab/Simulink model. Subsequently, the proposed model is integrated into a three-phase unbalanced load flow program. The IEEE 37-bus test system data is used to benchmark the results of the
power flow method.
Advisors/Committee Members: Venkatesh, Bala (Thesis advisor), Sood, Vijay K. (Thesis advisor), Ryerson University (Degree grantor).
Subjects/Keywords: Electric power systems – Mathematical models; Electric power system stability; Wind power
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APA (6th Edition):
Wander, I. S. (2011). Modeling of Synchronous Generator and Full-scale Converter for Distribution System Load Flow Analysis. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A1386
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):
Wander, Inderpreet Singh. “Modeling of Synchronous Generator and Full-scale Converter for Distribution System Load Flow Analysis.” 2011. Thesis, Ryerson University. Accessed January 19, 2021.
https://digital.library.ryerson.ca/islandora/object/RULA%3A1386.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wander, Inderpreet Singh. “Modeling of Synchronous Generator and Full-scale Converter for Distribution System Load Flow Analysis.” 2011. Web. 19 Jan 2021.
Vancouver:
Wander IS. Modeling of Synchronous Generator and Full-scale Converter for Distribution System Load Flow Analysis. [Internet] [Thesis]. Ryerson University; 2011. [cited 2021 Jan 19].
Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A1386.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wander IS. Modeling of Synchronous Generator and Full-scale Converter for Distribution System Load Flow Analysis. [Thesis]. Ryerson University; 2011. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A1386
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Stellenbosch University
21.
Steyn, Anrich Frederik Willem.
Modelling the technical influence of randomly distributed solar PV uptake on electrical distribution networks.
Degree: MEng, Electrical and Electronic Engineering, 2019, Stellenbosch University
URL: http://hdl.handle.net/10019.1/106150
► ENGLISH ABSTRACT: The solar photovoltaic (PV) industry has seen an exponential growth over the last decade, prompted mainly by government incentives and -regulations. Although the…
(more)
▼ ENGLISH ABSTRACT: The solar photovoltaic (PV) industry has seen an exponential growth over the last decade,
prompted mainly by government incentives and -regulations. Although the global PV industry is dominated by large, utility-scale PV plants, there has been an increase in the uptake of
distributed generation (DG) in the form of residential-, commercial- and industrial rooftop PV systems. Globally, utilities are confronted with the issue of integrating DG into electrical distribution networks. The introduction of DG via renewable energy technologies will cause a metamorphosis of conventional passive
power systems into active
power systems. DG will influence the technical characteristics of conventional
power systems, posing technical challenges
with regards to operation and control of the
power system.
This project investigates network integration of distributed rooftop PV systems on three distribution networks (one residential, one commercial and one industrial) in Cape Town,
South Africa. The residential and commercial networks are owned and operated by the City of Cape Town Municipality, whereas the industrial network is owned and operated by Eskom, the South African national electricity utility. Amidst the lack of a South African national standard with regard to distributed PV installations, the aim is to start to fill a void in
the understanding of PV network integration, in order to provide Eskom and CCT, as well as other local municipalities, with a better understanding of the technical effects of PV on
distribution networks, as well as the PV hosting capacity of these distribution networks.
This project develops a methodology that can be used to model the technical influence of randomly distributed solar PV uptake on electrical distribution networks. This study
focuses solely on the technical effects of voltage rise and equipment overload as network constraints for allowable PV uptake. The methodology first develops techniques with which to model network topology, -loads and PV generators. Subsequently, a simulation methodology is developed and applied to the distribution networks by means of algorithms developed in Digsilent Programming Language.
For the residential- and industrial area, the amount of PV-eligible roof space provides potential PV generation capacity that far exceeds the load requirements of the area. It is shown that allowable PV installations on the residential LV networks vary between 187 kW - 373 kW, and allowable PV penetration levels vary between 82% - 150%. Conductor overload and overvoltage constrain allowable PV uptake on the residential LV networks, whereas the residential MV/LV transformers provide adequate capacity to handle much higher PV penetration levels. The industrial network has the lowest allowable PV penetration level (31 %)
due to transformers being overloaded by large PV systems. The commercial area experiences no limit to the uptake of PV, since there is not enough PV-eligible roofspace, and subsequent potential PV generation capacity, to cause network…
Advisors/Committee Members: Rix, A. J., Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering..
Subjects/Keywords: UCTD; Photovoltaic power systems; Electric power distribution; Electric power systems
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APA (6th Edition):
Steyn, A. F. W. (2019). Modelling the technical influence of randomly distributed solar PV uptake on electrical distribution networks. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/106150
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):
Steyn, Anrich Frederik Willem. “Modelling the technical influence of randomly distributed solar PV uptake on electrical distribution networks.” 2019. Thesis, Stellenbosch University. Accessed January 19, 2021.
http://hdl.handle.net/10019.1/106150.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Steyn, Anrich Frederik Willem. “Modelling the technical influence of randomly distributed solar PV uptake on electrical distribution networks.” 2019. Web. 19 Jan 2021.
Vancouver:
Steyn AFW. Modelling the technical influence of randomly distributed solar PV uptake on electrical distribution networks. [Internet] [Thesis]. Stellenbosch University; 2019. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10019.1/106150.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Steyn AFW. Modelling the technical influence of randomly distributed solar PV uptake on electrical distribution networks. [Thesis]. Stellenbosch University; 2019. Available from: http://hdl.handle.net/10019.1/106150
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Montana State University
22.
Pourmousavi Kani, Seyyed Ali.
Power management and frequency regulation for microgrid and smart grid : a real-time demand response approach.
Degree: PhD, College of Engineering, 2014, Montana State University
URL: https://scholarworks.montana.edu/xmlui/handle/1/9364
► Future power systems (known as smart grid) will experience a high penetration level of variable distributed energy resources to bring abundant, affordable, clean, efficient, and…
(more)
▼ Future
power systems (known as smart grid) will experience a high penetration level of variable distributed energy resources to bring abundant, affordable, clean, efficient, and reliable
electric power to all consumers. However, it might suffer from the uncertain and variable nature of these generations in terms of reliability and especially providing required balancing reserves. In the current
power system structure, balancing reserves (provided by spinning and non-spinning
power generation units) usually are provided by conventional fossil-fueled
power plants. However, such
power plants are not the favorite option for the smart grid because of their low efficiency, high amount of emissions, and expensive capital investments on transmission and distribution facilities, to name a few. Providing regulation services in the presence of variable distributed energy resources would be even more difficult for islanded microgrids. The impact and effectiveness of demand response are still not clear at the distribution and transmission levels. In other words, there is no solid research reported in the literature on the evaluation of the impact of DR on
power system dynamic performance. In order to address these issues, a real-time demand response approach along with real-time
power management (specifically for microgrids) is proposed in this research. The real-time demand response solution is utilized at the transmission (through load-frequency control model) and distribution level (both in the islanded and grid-tied modes) to provide effective and fast regulation services for the stable operation of the
power system. Then, multiple real-time
power management algorithms for grid-tied and islanded microgrids are proposed to economically and effectively operate microgrids. Extensive dynamic modeling of generation, storage, and load as well as different controller design are considered and developed throughout this research to provide appropriate models and simulation environment to evaluate the effectiveness of the proposed methodologies. Simulation results revealed the effectiveness of the proposed methods in providing balancing reserves and microgrids' economic and stable operation. The proposed tools and approaches can significantly enhance the application of microgrids and demand response in the smart grid era. They will also help to increase the penetration level of variable distributed generation resources in the smart grid.
Advisors/Committee Members: Chairperson, Graduate Committee: M. Hashem Nehrir (advisor), Andrew S. Cifala and M. Hashem Nehrir were co-authors of the article, 'Impact of high penetration of PV generation on frequency and voltage in a distribution feeder' in the journal 'IEEE North American power symposium' which is contained within this thesis. (other), M. Hashem Nehrir was a co-author of the article, 'Real-time central demand response for primary frequency regulation in microgrids' in the journal 'IEEE transactions on smart grid' which is contained within this thesis. (other), M. Hashem Nehrir was a co-author of the article, 'Real-time optimal demand response for frequency regulation in smart microgrid environment' in the journal 'International conference on power and energy system' which is contained within this thesis. (other), M. Hashem Nehrir was a co-author of the article, 'Introducing dynamic demand response in the LFC model' in the journal 'IEEE transactions on power systems' which is contained within this thesis. (other), M. Hashem Nehrir was a co-author of the article, 'LFC-DR model expansion to multi-area power systems' submitted to the journal 'IEEE transactions on power systems' which is contained within this thesis. (other), Stasha N. Patrick and M. Hashem Nehrir were co-authors of the article, 'Real-time demand response through aggregate electric water heaters for load shifting and balancing intermittent wind generation' in the journal 'IEEE transactions on smart grid' which is contained within this thesis. (other), M. Hashem Nehrir and Ratnesh K. Sharma were co-authors of the article, 'Ownership cost calculation for distributed energy resources using uncertainty and risk analyses' submitted to the journal 'IEEE Transactions on power systems' which is contained within this thesis. (other), Ratnesh K. Sharma and Babak Asghari were co-authors of the article, 'A framework for real-time power management of a grid-tied microgrid to extend battery lifetime and reduce cost of energy' in the journal 'IEEE innovative smart grid technologies' which is contained within this thesis. (other), M. Hashem Nehrir, Christopher M. Colson and Caisheng Wang were co-authors of the article, 'Real-time energy management of a stand-alone hybrid wind-microturbine energy system using particle swarm optimization' in the journal 'IEEE transactions on sustainable energy' which is contained within this thesis. (other), M. Hashem Nehrir and Ratnesh K. Sharma were co-authors of the article, 'Multi-timescale power management for islanded microgrids including storage and demand response' submitted to the journal 'IEEE transactions on smart grid' which is contained within this thesis. (other).
Subjects/Keywords: Smart power grids.; Electric power systems Management.; Electric power-plants Load.
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APA ·
Chicago ·
MLA ·
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CSE |
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APA (6th Edition):
Pourmousavi Kani, S. A. (2014). Power management and frequency regulation for microgrid and smart grid : a real-time demand response approach. (Doctoral Dissertation). Montana State University. Retrieved from https://scholarworks.montana.edu/xmlui/handle/1/9364
Chicago Manual of Style (16th Edition):
Pourmousavi Kani, Seyyed Ali. “Power management and frequency regulation for microgrid and smart grid : a real-time demand response approach.” 2014. Doctoral Dissertation, Montana State University. Accessed January 19, 2021.
https://scholarworks.montana.edu/xmlui/handle/1/9364.
MLA Handbook (7th Edition):
Pourmousavi Kani, Seyyed Ali. “Power management and frequency regulation for microgrid and smart grid : a real-time demand response approach.” 2014. Web. 19 Jan 2021.
Vancouver:
Pourmousavi Kani SA. Power management and frequency regulation for microgrid and smart grid : a real-time demand response approach. [Internet] [Doctoral dissertation]. Montana State University; 2014. [cited 2021 Jan 19].
Available from: https://scholarworks.montana.edu/xmlui/handle/1/9364.
Council of Science Editors:
Pourmousavi Kani SA. Power management and frequency regulation for microgrid and smart grid : a real-time demand response approach. [Doctoral Dissertation]. Montana State University; 2014. Available from: https://scholarworks.montana.edu/xmlui/handle/1/9364
Cape Peninsula University of Technology
23.
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 ·
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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 January 19, 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. 19 Jan 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 Jan 19].
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
Drexel University
24.
Weaver, Bryan A.
High power switching device SPICE models based on circuit response.
Degree: 2011, Drexel University
URL: http://hdl.handle.net/1860/3650
► Power electronics converter capabilities are expanding into power levels of 10 kW and above with the support of steadily growing high power semiconductor device capabilities.…
(more)
▼ Power electronics converter capabilities are expanding into power levels of 10 kW and above with the support of steadily growing high power semiconductor device capabilities. Computer aided design and circuit simulation tools are likewise growing, yet the supply of available and accurate SPICE models for high power semiconductor devices isn’t keeping pace with the expanding device capabilities. In an effort to improve model availability and accuracy, user configurable high power switching device SPICE models for the Schottky diode, Insulated Gate Bipolar and power MOSFET transistors will be developed. In a departure from conventional physics based semiconductor modeling techniques, circuit response models establish how the device responds to circuit characteristics. These SPICE circuit response models will be user configurable by means of data from either or both device measurements and datasheet figures. With access to these models, the circuit designer / application engineer will minimize the need to search for SPICE models of the selected component or need to investigate the overall accuracy of the models that are available.
Ph.D., Electrical Engineering – Drexel University, 2011
Advisors/Committee Members: Nwankpa, Chika O..
Subjects/Keywords: Electric engineering; Electric power systems; Semiconductors
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APA ·
Chicago ·
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APA (6th Edition):
Weaver, B. A. (2011). High power switching device SPICE models based on circuit response. (Thesis). Drexel University. Retrieved from http://hdl.handle.net/1860/3650
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):
Weaver, Bryan A. “High power switching device SPICE models based on circuit response.” 2011. Thesis, Drexel University. Accessed January 19, 2021.
http://hdl.handle.net/1860/3650.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Weaver, Bryan A. “High power switching device SPICE models based on circuit response.” 2011. Web. 19 Jan 2021.
Vancouver:
Weaver BA. High power switching device SPICE models based on circuit response. [Internet] [Thesis]. Drexel University; 2011. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/1860/3650.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Weaver BA. High power switching device SPICE models based on circuit response. [Thesis]. Drexel University; 2011. Available from: http://hdl.handle.net/1860/3650
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Drexel University
25.
Lahiri, Sudipta.
Modeling and simulation of shipboard integrated power systems.
Degree: 2011, Drexel University
URL: http://hdl.handle.net/1860/3494
► The Integrated Power System (IPS) architecture forms the basis for designing current and future generations of naval power systems. This offers greater survivability and increased…
(more)
▼ The Integrated Power System (IPS) architecture forms the basis for designing current and future generations of naval power systems. This offers greater survivability and increased efficiency over mechanical drive systems. The Power Management System (PMS) for the IPS incorporates a supervisory controller that optimizes the delivery of power to vital loads in the event of system disruptions. Deriving optimal control strategies requires an adequate model of the IPS as well as software simulation capability to analyze the behavior of the model. This thesis presents a model for the IPS while accounting for its unique features, develops a software simulation tool for numerical simulation of dynamic power systems. Simulation results of the IPS are presented and the applicability of the model for derivation of optimal controllers is discussed.Dynamic models for individual components: generator, prime-mover, propulsion motor, vital and non vital static loads and energy storage device, are presented. The differential equations presenting the transient dynamics are combined with the algebraic equations of the network to form a differential-algebraic model. A software platform for dynamic simulation of power systems is developed in Mathematica. The behavior of the model is evaluated and validated by simulating system disturbances. For tractability in numerical computation of the PMS, the order of the differential model is reduced by Singular Perturbation method. Simulations are performed to show that the reduced order model and the full order model converge to the same steady state while the deviation of the two models is within acceptable margins during the transient period. The reduced order model may be used for derivation of optimal control policies by dynamic programming, and the reduction in size of the state space offers a substantial reduction in the number of computations.
M.S., Electrical Engineering – Drexel University, 2011
Advisors/Committee Members: Niebur, Dagmar.
Subjects/Keywords: Electric engineering; Electric power systems; Systems engineering
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APA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lahiri, S. (2011). Modeling and simulation of shipboard integrated power systems. (Thesis). Drexel University. Retrieved from http://hdl.handle.net/1860/3494
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):
Lahiri, Sudipta. “Modeling and simulation of shipboard integrated power systems.” 2011. Thesis, Drexel University. Accessed January 19, 2021.
http://hdl.handle.net/1860/3494.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lahiri, Sudipta. “Modeling and simulation of shipboard integrated power systems.” 2011. Web. 19 Jan 2021.
Vancouver:
Lahiri S. Modeling and simulation of shipboard integrated power systems. [Internet] [Thesis]. Drexel University; 2011. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/1860/3494.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lahiri S. Modeling and simulation of shipboard integrated power systems. [Thesis]. Drexel University; 2011. Available from: http://hdl.handle.net/1860/3494
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
26.
Kaseke, Nyasa.
An estimate of the cost of electricity outages in Zimbabwe.
Degree: PhD, Faculty of Business and Economic Sciences, 2012, Nelsom Mandela Metropolitan University
URL: http://hdl.handle.net/10948/d1011119
► This thesis estimates the cost of electricity outages in Zimbabwe for the year 2009. Much reference is made to government, the power utility - Zimbabwe…
(more)
▼ This thesis estimates the cost of electricity outages in Zimbabwe for the year 2009. Much reference is made to government, the
power utility - Zimbabwe Electricity Supply Authority (ZESA) and other countries in the Southern African
Power Pool (SAPP), also experiencing electricity outages. An electricity outage is a complete loss of
power supply to an area. An outage may result from planned or unplanned load shedding or faults. Load shedding is accelerated by
power supply shortages. The shortages are experienced during peak demand times. In 2009, Zimbabwe’s peak demand was about 1574MW. ZESA had the capacity to supply 1080MW and imported 100MW (guaranteed from Mozambique), leaving a shortfall of 394MW. This shortfall is worsened by transmission losses (about 108MW) and consumption by ZESA properties (about 200MW) bringng down the supply to customers of about 700MW. The supply shortage is the result of a lack of investment in the
power sector by government for expanded generation capacity, incorrect pricing, droughts, internal conflicts, skills flight, government energy sector regulation, vandalism of equipment and under supply of coal to thermal
power stations. Consumers in all sectors are experiencing
power outage incidences of different duration. The severity of the inconvenience depends on the load shedding time table, preferences of the
power utility and arrangements that can be made with the utility.
Power outages negatively affect (and result in cost to) the productive sectors (industry, mining and farming) and households. The main objective of the thesis is to estimate the cost of
power outages to the sectors. Sub-objectives of the study include: to identify the main features of
power crisis in Zimbabwe and government response to it with a regional
power generated setting; to formulate a model that clearly identifies the different cost components of
power outages in Zimbabwe; to identify appropriate methods by which to estimate these cost components; to estimate the cost of
power outages to the productive sectors (mining, agriculture and industrial) and households of Zimbabwe; to critically analyse the credibility of these estimates, and to consider the saving of the costs of outages achieved through increased investment in generating capacity in Zimbabwe. ZESA undertook reforms (institutional and tariff) in order to improve management efficiencies and supply. It was divided into five entities resulting in management and financial improvement, but its reform of tariffs has been stiffled by subsidies and price regulations. ZESA adopted the cost plus rate of return pricing strategy in 2004 but regulation kept the tariff below cost. The regulation is pro-poor in aim but it encourages wasteful consumption. Similar supply shortages are affecting the whole SAPP group. The
power pool load shed 758MW in 2009. In Zimbabwe alone load shedding was 315MW. In an attempt to solve the problem, member utilities engage in bilateral contacts and short-term trading through Short Term Energy Markets (STEM). A number of Southern…
Advisors/Committee Members: Hosking, Stephen Prof.
Subjects/Keywords: Electric power failures – Zimbabwe; Electric utilities
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APA (6th Edition):
Kaseke, N. (2012). An estimate of the cost of electricity outages in Zimbabwe. (Doctoral Dissertation). Nelsom Mandela Metropolitan University. Retrieved from http://hdl.handle.net/10948/d1011119
Chicago Manual of Style (16th Edition):
Kaseke, Nyasa. “An estimate of the cost of electricity outages in Zimbabwe.” 2012. Doctoral Dissertation, Nelsom Mandela Metropolitan University. Accessed January 19, 2021.
http://hdl.handle.net/10948/d1011119.
MLA Handbook (7th Edition):
Kaseke, Nyasa. “An estimate of the cost of electricity outages in Zimbabwe.” 2012. Web. 19 Jan 2021.
Vancouver:
Kaseke N. An estimate of the cost of electricity outages in Zimbabwe. [Internet] [Doctoral dissertation]. Nelsom Mandela Metropolitan University; 2012. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10948/d1011119.
Council of Science Editors:
Kaseke N. An estimate of the cost of electricity outages in Zimbabwe. [Doctoral Dissertation]. Nelsom Mandela Metropolitan University; 2012. Available from: http://hdl.handle.net/10948/d1011119
University of Johannesburg
27.
Marais, Solomon Josua.
Geintegreerde drywingsfilters vir mutators.
Degree: 2012, University of Johannesburg
URL: http://hdl.handle.net/10210/7235
► M.Ing.
Switch-mode power supplies are currently constructed by interconnecting various discrete components. There are certain drawbacks with the discrete interconnection method and as is the…
(more)
▼ M.Ing.
Switch-mode power supplies are currently constructed by interconnecting various discrete components. There are certain drawbacks with the discrete interconnection method and as is the case with consumer electronics functional blocks of the converter must be constructed as a whole before improvements at various levels may be expected. The focus of this thesis is the functional integration of high power output filters for switchmode power supplies. Various capacitor technologies are discussed and investigated for applicability in integrated filters. The overall response of the prototype filters which has constructed are compared to that of equivalent conventional discrete filters. a General Modelling scheme is presented which is applicable to a wide range of structures and independent of excitation to facilitate improved design and prediction of the behaviour of the structures.
Subjects/Keywords: Electric current converters; Electric filters; Power electronics
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APA (6th Edition):
Marais, S. J. (2012). Geintegreerde drywingsfilters vir mutators. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/7235
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):
Marais, Solomon Josua. “Geintegreerde drywingsfilters vir mutators.” 2012. Thesis, University of Johannesburg. Accessed January 19, 2021.
http://hdl.handle.net/10210/7235.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Marais, Solomon Josua. “Geintegreerde drywingsfilters vir mutators.” 2012. Web. 19 Jan 2021.
Vancouver:
Marais SJ. Geintegreerde drywingsfilters vir mutators. [Internet] [Thesis]. University of Johannesburg; 2012. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10210/7235.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Marais SJ. Geintegreerde drywingsfilters vir mutators. [Thesis]. University of Johannesburg; 2012. Available from: http://hdl.handle.net/10210/7235
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Johannesburg
28.
Barnard, Jacobus Marthinus.
Translational contactless power supply systems with ultrasonic frequencies.
Degree: 2012, University of Johannesburg
URL: http://hdl.handle.net/10210/8242
► D.Ing.
In this thesis, contactless power transmission with sliding transformers to mobile loads is investigated. The sliding transformer comprises an extended primary winding - placed…
(more)
▼ D.Ing.
In this thesis, contactless power transmission with sliding transformers to mobile loads is investigated. The sliding transformer comprises an extended primary winding - placed along the path of travel - which is fed through a core containing a secondary winding and which is attached to a mobile load. In the first chapter problems with existing power supply systems are discussed whereafter several possible applications of such a system are identified. In this chapter different methods of obtaining contactless power transmission are also discussed and a brief discussion of a practical, cost effective system is given. In chapter two the application of different resonant topologies to compensate the large structural inductance of the sliding transformer is investigated. A Series Resonant, Series Loaded topology is identified as the most practical and efficient topology for this application and a more detailed analysis of this topology - as applied to this case - is given. Formulas to calculate the sliding transformer parameters are given in the third chapter and two quantities relating the optimization of sliding transformers to the parameters thereof, are defined. Methods to optimize sliding transformers in terms of these two quantities, and also with respect to EMI, are also discussed in this chapter. The design of a five meter long experimental system which delivers 15 kVA to a mobile load is given in chapter four and experimental results of this system are presented. In chapter five a detailed investigation into different output power control methods is conducted. The effect of these control methods on EMI is investigated by means of numerical simulation of a Series Resonant, Series Loaded system under these different control methods. The most complex control method which generates the most EMI, namely frequency and pulse burst control, is implemented into the experimental system to investigate the limitations thereof. Experimental results of this controlled system are presented. It is found that this control method increases the control range obtainable with classical frequency control but introduces many limitations due to discontinuous primary current. It is concluded in the last chapter that it is possible to optimize sliding transformers within achievable cost constraints to such an extent that such systems have acceptable efficiencies and that reasonable system lengths are obtainable.
Subjects/Keywords: Power resources; Electric current converters; Electric transformers
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Record Details
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Barnard, J. M. (2012). Translational contactless power supply systems with ultrasonic frequencies. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/8242
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):
Barnard, Jacobus Marthinus. “Translational contactless power supply systems with ultrasonic frequencies.” 2012. Thesis, University of Johannesburg. Accessed January 19, 2021.
http://hdl.handle.net/10210/8242.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Barnard, Jacobus Marthinus. “Translational contactless power supply systems with ultrasonic frequencies.” 2012. Web. 19 Jan 2021.
Vancouver:
Barnard JM. Translational contactless power supply systems with ultrasonic frequencies. [Internet] [Thesis]. University of Johannesburg; 2012. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10210/8242.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Barnard JM. Translational contactless power supply systems with ultrasonic frequencies. [Thesis]. University of Johannesburg; 2012. Available from: http://hdl.handle.net/10210/8242
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Johannesburg
29.
Venter, Fredrik Hendrik.
Harmonic impedance estimation of a power system implementing frequency domain measurement techniques.
Degree: 2012, University of Johannesburg
URL: http://hdl.handle.net/10210/5585
► M.Ing.
The increased used of non-linear loads within the power system during recent years have resulted in deviations from the perfect sinusoidal voltage and current…
(more)
▼ M.Ing.
The increased used of non-linear loads within the power system during recent years have resulted in deviations from the perfect sinusoidal voltage and current waveform. This deviation from the perfect sinusoidal waveform can be expressed according to Fourier analysis by a set of co-sinusoidal waveforms having frequencies, which are a multiple of the fundamental frequency, referred to as harmonics. Non-linear loads are generally characterised by harmonic currents. It is therefore often preferred to express the harmonic emission limits in terms of harmonic currents rather than harmonic voltages. In order to translate the harmonic currents into harmonic voltages the harmonic impedance of the power system must be known. The power system's harmonic impedance can be assessed via computational, simulation and measurement techniques. The study will concentrate on the estimation of the harmonic impedance of a 33kV power system by implementing two online frequency domain measurement techniques. Both techniques are applied at the point of delivery of a dominant nonlinear load during normal and energisation load conditions with its power factor correction capacitor bank in and out off service. The estimated harmonic impedance is then compared with the calculated and simulated harmonic impedance.
Subjects/Keywords: Harmonics (Electric waves); Electric power systems
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Venter, F. H. (2012). Harmonic impedance estimation of a power system implementing frequency domain measurement techniques. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/5585
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):
Venter, Fredrik Hendrik. “Harmonic impedance estimation of a power system implementing frequency domain measurement techniques.” 2012. Thesis, University of Johannesburg. Accessed January 19, 2021.
http://hdl.handle.net/10210/5585.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Venter, Fredrik Hendrik. “Harmonic impedance estimation of a power system implementing frequency domain measurement techniques.” 2012. Web. 19 Jan 2021.
Vancouver:
Venter FH. Harmonic impedance estimation of a power system implementing frequency domain measurement techniques. [Internet] [Thesis]. University of Johannesburg; 2012. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10210/5585.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Venter FH. Harmonic impedance estimation of a power system implementing frequency domain measurement techniques. [Thesis]. University of Johannesburg; 2012. Available from: http://hdl.handle.net/10210/5585
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Johannesburg
30.
Le Roux, Wiehan.
'n Ondersoek na begrensings by die kompensasie van vervorming in elektriese energieverspreidingsnetwerke.
Degree: 2012, University of Johannesburg
URL: http://hdl.handle.net/10210/5923
► M.Ing.
This study investigates the limits to which distortion can be compensated in electrical distribution networks. Many factors hinder the "ideal" compensation of the line…
(more)
▼ M.Ing.
This study investigates the limits to which distortion can be compensated in electrical distribution networks. Many factors hinder the "ideal" compensation of the line current to a perfect sinusoidal, in phase, scaled replica of the supply voltage. The different power theories that can be used to derive the reference compensation current, is one of the fundamental limits. The differences and correspondences between the FBD and Czarnecki theories are investigated in detail. Furthermore, it is shown by simulation and practical results, that the effectivity of compensation by the instantaneous power theory is load dependent. The compensation strategy and topology also impose limits on the effectivity of compensation. The position and strategy of a compensator determine whether the consumer is able to isolate his distortion from the rest of the network, or isolate himself from the distortion of other consumers. Distortion frequencies and system impedances are chosen specifically to visually show the effect of the different topologies and strategies, by means of simulation. One of the most important limits brought about by new technology, is the lagging of the reference compensation current, due to the use of signal processing in determining the reference signals. The effect of this lagging reference is clearly shown by means of simulation and practical compensation systems. An effectivity index for this phenomenon is defined for steady state systems. The dynamic limitations of this lagging reference compensation current is investigated thoroughly. A method is derived by which the maximum fault, due to the sampling time and signal processing time, can be calculated when a high f-region occurs in the line current. The dynamic response of the compensation system is also limited by the ' di-ability of the converter. Therefore, a method is developed to calculate the individual fault contribution of the lagging reference as well as the converter. This method enables designers to determine the parameters of the signal processing system and the converter in the planning phase. The use of a maximum sampling frequency is stressed. In the experimental work, a 10kVA, PWM-switched IGBT inverter is used as a parallel voltage fed compensator. It compensates for two non-linear loads : a three phase diode rectifier with an inductive load, and a three phase diode rectifier with a capacitive load. The practical compensation according to the instantaneous power theory of these two loads, confirms that the result of this compensation is load dependent. The effect of the lagging reference compensation current in a practical system is also shown.
Subjects/Keywords: Electric power distribution - South Africa; Electric networks
Record Details
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Share »
Record Details
Similar Records
Cite
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Le Roux, W. (2012). 'n Ondersoek na begrensings by die kompensasie van vervorming in elektriese energieverspreidingsnetwerke. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/5923
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):
Le Roux, Wiehan. “'n Ondersoek na begrensings by die kompensasie van vervorming in elektriese energieverspreidingsnetwerke.” 2012. Thesis, University of Johannesburg. Accessed January 19, 2021.
http://hdl.handle.net/10210/5923.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Le Roux, Wiehan. “'n Ondersoek na begrensings by die kompensasie van vervorming in elektriese energieverspreidingsnetwerke.” 2012. Web. 19 Jan 2021.
Vancouver:
Le Roux W. 'n Ondersoek na begrensings by die kompensasie van vervorming in elektriese energieverspreidingsnetwerke. [Internet] [Thesis]. University of Johannesburg; 2012. [cited 2021 Jan 19].
Available from: http://hdl.handle.net/10210/5923.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Le Roux W. 'n Ondersoek na begrensings by die kompensasie van vervorming in elektriese energieverspreidingsnetwerke. [Thesis]. University of Johannesburg; 2012. Available from: http://hdl.handle.net/10210/5923
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