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Texas A&M University
1.
Ming, Pingjia.
Glow Discharge Enhanced Chemical Reaction: Application in Ammonia Synthesis and Hydrocarbon Gas Cleanup.
Degree: MS, Mechanical Engineering, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/153286 
► Two different plasma enhanced processing technologies were investigated in this study: ammonia synthesis from steam and nitrogen, and hydrocarbon gas clean up. Ammonia is a…
(more)
▼ Two different plasma enhanced processing technologies were investigated in this study: ammonia synthesis from steam and nitrogen, and hydrocarbon gas clean up.
Ammonia is a common sanitizer in swimming pool and fish tank, changing the pH of the water, which does not benefit bacteria. Also ammonia is used in various NOx reduction technologies, for example, selective catalytic reduction (SCR) methods have been studied for the cleaning of diesel engine exhaust. A small compact glow discharge was applied to investigate ammonia synthesis from steam and nitrogen. Ammonia was successfully detected via UV-VIS absorbance and through increasing pH value of treated water by product gas.
Heavier hydrocarbon C3 to C5 are produced with natural gas, but cannot be used in sensitive energy conversion systems, like solid oxide fuel cell (SOFC). Utilizing small amount of energy to clean up and reform heavier hydrocarbon into synthesis gas is necessary when using hydrocarbon sources which contain heavier hydrocarbons mixture such as EPE (74.8% methane, 8% ethane, 8% ethylene, 2.1% propane and 1.1% Propene). Non-thermal plasmas, due to their unique non-equilibrium characteristics, offer advantages as method of reforming at lower temperature (100-150 ºC) and atmospheric pressure. For an EPE gas mixture, a high conversion and low specific energy cost is desirable. Variation in discharge power density, air and, water addition were tested, in order to find conditions which were energetically feasibility, efficiency and sufficiently reduced the higher hydrocarbon. High conversion efficiency was achieved, in propane and propene, which was more than 90%, without carbon deposition through air addition. For a 1 J/ml power density and 1.08 O2/C ratio condition, a process efficiency of 74% and 54% available output energy was achieved. At the same time, the concentration of ethane, ethylene, propane, propylene, and acetylene were cleaned-up to value of 1.01%, 1.67%, 0.08%, 0.00%, and 0.50%, respectively, less than 20% of their original input amount. Higher power density produced cleaner (less high hydrocarbons) in the products, and were still energetically feasible, but less efficient.
Advisors/Committee Members: Staack, David (advisor), Annamalai, Kalyan (committee member), Ehsani, Mehrdad (committee member).
Subjects/Keywords: Plasma; Hydrocarbon gas; Ammonia; Syngas; Hydrogen; Low temperature
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APA (6th Edition):
Ming, P. (2014). Glow Discharge Enhanced Chemical Reaction: Application in Ammonia Synthesis and Hydrocarbon Gas Cleanup. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/153286
Chicago Manual of Style (16th Edition):
Ming, Pingjia. “Glow Discharge Enhanced Chemical Reaction: Application in Ammonia Synthesis and Hydrocarbon Gas Cleanup.” 2014. Masters Thesis, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/153286.
MLA Handbook (7th Edition):
Ming, Pingjia. “Glow Discharge Enhanced Chemical Reaction: Application in Ammonia Synthesis and Hydrocarbon Gas Cleanup.” 2014. Web. 17 Apr 2021.
Vancouver:
Ming P. Glow Discharge Enhanced Chemical Reaction: Application in Ammonia Synthesis and Hydrocarbon Gas Cleanup. [Internet] [Masters thesis]. Texas A&M University; 2014. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/153286.
Council of Science Editors:
Ming P. Glow Discharge Enhanced Chemical Reaction: Application in Ammonia Synthesis and Hydrocarbon Gas Cleanup. [Masters Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/153286
Texas A&M University
2.
Alismail, Fahad Saleh M.
A Distributionally Robust Optimization Approach for the Optimal Wind Farm Allocation in Multi-Area Power Systems.
Degree: PhD, Electrical Engineering, 2016, Texas A&M University
URL: http://hdl.handle.net/1969.1/158602
► This dissertation presents a distributionally robust planning model to determine the optimal allocation of wind farms in a multi-area power system, so that the expected…
(more)
▼ This dissertation presents a distributionally robust planning model to determine
the optimal allocation of wind farms in a multi-area power system, so that the expected
energy not served (EENS) is minimized under uncertain conditions of wind
power and generator forced outages. Unlike conventional stochastic programming
approaches that rely on detailed information of the exact probability distribution,
this proposed method attempts to minimize the expectation term over a collection of
distributions characterized by accessible statistical measures, so it is more practical in
cases where the detailed distribution data is unavailable. This planning model is formulated as a two-stage problem, where the wind power capacity allocation decisions
are determined in the first stage, before the observation of uncertainty outcomes,
and operation decisions are made in the second stage under specific uncertainty realizations.
In this dissertation, the second-stage decisions are approximated by linear decision
rule functions, so that the distributionally robust model can be reformulated into a
tractable second-order cone programming problem. Case studies based on a five-area
system are conducted to demonstrate the effectiveness of the proposed method. The
model is extended to deal with the hybrid system by including the solar power as
a third source of uncertainty besides the wind power and conventional generation
forced outages. The correlation between the wind and solar power is investigated to
capture the diversity and the availability of all included power resources.
Capacity credit is calculated to measure the effective load carrying capacity of
the allocated renewable resources. The probabilistic method including Monte Carlo
simulation is used to calculate the loss of load expectation (LOLE) at different peak loads and analytically determined the capacity credit of wind and solar power generation
for several installed wind capacities. The penetration factor and the availability
of the renewable power generation are major factors influencing the capacity credit
value, besides the overall power system reliability level.
The results reflect the usefulness of utilizing the distributionally robust optimization
approach in the data-driven decision making. It positively responds with the
amount of the information provided regarding the uncertain variables in the renewable
power generation allocation problem and sequentially in the system reliability
and the yielded capacity credit values of the allocated renewable generation units.
Advisors/Committee Members: Singh, Chanan (advisor), Ehsani, Mehrdad (committee member), Kish, Laszlo (committee member), Ntaimo, Lewis (committee member).
Subjects/Keywords: wind power planning; wind power distribution; generator failures; distributionally robust optimization; linear decision rule
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APA (6th Edition):
Alismail, F. S. M. (2016). A Distributionally Robust Optimization Approach for the Optimal Wind Farm Allocation in Multi-Area Power Systems. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/158602
Chicago Manual of Style (16th Edition):
Alismail, Fahad Saleh M. “A Distributionally Robust Optimization Approach for the Optimal Wind Farm Allocation in Multi-Area Power Systems.” 2016. Doctoral Dissertation, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/158602.
MLA Handbook (7th Edition):
Alismail, Fahad Saleh M. “A Distributionally Robust Optimization Approach for the Optimal Wind Farm Allocation in Multi-Area Power Systems.” 2016. Web. 17 Apr 2021.
Vancouver:
Alismail FSM. A Distributionally Robust Optimization Approach for the Optimal Wind Farm Allocation in Multi-Area Power Systems. [Internet] [Doctoral dissertation]. Texas A&M University; 2016. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/158602.
Council of Science Editors:
Alismail FSM. A Distributionally Robust Optimization Approach for the Optimal Wind Farm Allocation in Multi-Area Power Systems. [Doctoral Dissertation]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/158602
Texas A&M University
3.
Ge, Shen.
Design of a Surface Albedo Modification Payload for Near Earth Asteroid (NEA) Mitigation.
Degree: MS, Aerospace Engineering, 2011, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10184
► The development of the Surface Albedo Treatment System (SATS) onboard a spacecraft mission to the near earth asteroid (NEA) Apophis in 2012 is an innovative…
(more)
▼ The development of the Surface Albedo Treatment System (SATS) onboard a spacecraft mission to the near earth asteroid (NEA) Apophis in 2012 is an innovative concept of deflecting NEAs from possible impact with the Earth through altering the Yarkovsky effect, a non-secular force in the solar system due to uneven surface thermal emission most profoundly affecting small rotating bodies subjected to sunlight. Though this force is small, its magnitude can be dramatic if extended over a period of time and if it uses the close approach of an asteroid near Earth to magnify the perturbation. The payload dispenses colored powder called albedo changing particles (ACPs) onto the surface changing its albedo and indirectly the surface temperature which changes the Yarkovsky effect. This study gives an in-depth description of both computational and experimental parts of the design of this system with primary focus on initial ground test setup. The initial experiments proposed to design the SATS is outlined in detail and justified by the mission criterion of interest as well as modeling the actual dispersal on the surface.
Advisors/Committee Members: Hyland, David (advisor), Turner, James (committee member), Boyd, Jim (committee member), Ehsani, Mehrdad (committee member).
Subjects/Keywords: albedo; Apophis; armageddon; asteroids; deflection; NEOs; NEAs; space mission; tribodispenser; Yarkovsky effect; YORP
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APA (6th Edition):
Ge, S. (2011). Design of a Surface Albedo Modification Payload for Near Earth Asteroid (NEA) Mitigation. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10184
Chicago Manual of Style (16th Edition):
Ge, Shen. “Design of a Surface Albedo Modification Payload for Near Earth Asteroid (NEA) Mitigation.” 2011. Masters Thesis, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10184.
MLA Handbook (7th Edition):
Ge, Shen. “Design of a Surface Albedo Modification Payload for Near Earth Asteroid (NEA) Mitigation.” 2011. Web. 17 Apr 2021.
Vancouver:
Ge S. Design of a Surface Albedo Modification Payload for Near Earth Asteroid (NEA) Mitigation. [Internet] [Masters thesis]. Texas A&M University; 2011. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10184.
Council of Science Editors:
Ge S. Design of a Surface Albedo Modification Payload for Near Earth Asteroid (NEA) Mitigation. [Masters Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10184
Texas A&M University
4.
Al-Masri, Hussein Mohammad Khalaf.
Development of an Engineering, Economic and Environmental Design Tool for Planetary Scale Sustainable Power Systems.
Degree: PhD, Electrical Engineering, 2016, Texas A&M University
URL: http://hdl.handle.net/1969.1/158974
► There are plenty of fossil fuels for hundreds of years. The importance of moving toward sustainable energy stems from global climate change and the need…
(more)
▼ There are plenty of fossil fuels for hundreds of years. The importance of moving toward sustainable energy stems from global climate change and the need to provide access to affordable energy to all of humanity. The way forward is to help the developing world that dominates the future emissions (90% solution) with “clean” energy, rather than reducing the emissions for the developed world to make it clean (10% solution). The 90% solution has to be done consistent with appropriate technologies, sound business plan, and market economy. The ultimate goal of information presented in this dissertation is to satisfy a country’s national load demand by establishing multiple utility grid connections to various geographic locations of high wind or solar energy resources. This is done by building a new optimization design tool which investigates the engineering, economic feasibility and the environmental impacts. This tool is applied in Jordan as a case validation. This is done using single figure of merit (SFOM) optimizations. A mathematical modeling is developed for each component, and the optimal configuration is determined for each city. The annual system cost of energy (ASCE) is optimized to be 32.57% less than the grid energy price, and the CO2 emissions are reduced by 80.13%. These are excellent indications for the economic feasibility and the environmental benefits of the designed system. The levelized cost of energy (LCOE), total net present cost (TNPC), renewable penetration (RP) and annual emission indicator (AEI) are 0.058212 /kWh, 8.713857 billion, 59.49817% and 4.576 Megatonne/year respectively. Multi-figure of merits (MFOM) optimization cases based on a non-sorting genetic algorithm (NSGA) are investigated such as: AEI vs. ASCE, AEI vs. LCOE, AEI vs. RP and (RP, LCOE, AEI). The MFOM optimization results are either 2D or 3D Pareto frontier, where exists various competitive non-dominant solutions. The sweet spot selection (triple-S) procedure is proposed to help select the sweet spot in the two figure of merits Pareto frontier in order to have both environmental and feasible solutions. This design tool will be versatile enough for the application to any on-grid renewable power system worldwide. It will be made available on the internet as a public service of
Texas A&
M University Renewable Energy Program at the Power Electronics and Motor Drives Laboratory of the Electrical Engineering Department.
Advisors/Committee Members: Ehsani, Mehrdad (advisor), Singh, Chanan (committee member), Kish, Laszlo (committee member), Talreja, Ramesh (committee member).
Subjects/Keywords: hybrid wind/PV power system; Multi-points grid connection; national demand; sustainable energy systems; techno-economic; genetic algorithm; NSGA; sizing; sustainable energy systems
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APA (6th Edition):
Al-Masri, H. M. K. (2016). Development of an Engineering, Economic and Environmental Design Tool for Planetary Scale Sustainable Power Systems. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/158974
Chicago Manual of Style (16th Edition):
Al-Masri, Hussein Mohammad Khalaf. “Development of an Engineering, Economic and Environmental Design Tool for Planetary Scale Sustainable Power Systems.” 2016. Doctoral Dissertation, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/158974.
MLA Handbook (7th Edition):
Al-Masri, Hussein Mohammad Khalaf. “Development of an Engineering, Economic and Environmental Design Tool for Planetary Scale Sustainable Power Systems.” 2016. Web. 17 Apr 2021.
Vancouver:
Al-Masri HMK. Development of an Engineering, Economic and Environmental Design Tool for Planetary Scale Sustainable Power Systems. [Internet] [Doctoral dissertation]. Texas A&M University; 2016. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/158974.
Council of Science Editors:
Al-Masri HMK. Development of an Engineering, Economic and Environmental Design Tool for Planetary Scale Sustainable Power Systems. [Doctoral Dissertation]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/158974
Texas A&M University
5.
Al Jaafari, Khaled Ali Mohammed Ali.
Electromagnetic Analysis of Stator Ground Faults in Synchronous Generators.
Degree: PhD, Electrical Engineering, 2016, Texas A&M University
URL: http://hdl.handle.net/1969.1/158003
► There are many stator ground faults protection schemes available in the industry. These schemes relatively perform well in detecting the faults in the stator winding.…
(more)
▼ There are many stator ground faults protection schemes available in the industry. These schemes relatively perform well in detecting the faults in the stator winding. The protection of the neutral point vicinity is the challenge because of the low voltage induced in that area. The 100% stator protection concept has been around for a long time. However, these schemes sometimes have limitations. The fact that stator ground fault detection in generators depends on many factors like the generator design, the generator loading, and the equivalent capacitance of the generator’s windings and the apparatus connected to it, occasionally caused these schemes to fail to detect the winding faults near the neutral or to miss-operate during normal system disturbance. In this dissertation, an electromagnetic analysis of the synchronous generators stator winding ground faults is presented. A mathematical model for the synchronous generator under stator winding fault is being derived. In addition, a study is conducted using 2D FEA simulation and verified using experimental testing on the third harmonic ratio under-voltage protection scheme. Another study focuses on finding a unique signature for the stator ground fault using wavelet transform. This analysis is an attempt to understand this phenomenon from the machine design point of view by looking at the generator terminal and neutral voltages. The analysis presented in this dissertation shows that the protection schemes perform positively in detecting stator ground fault. However, it does not show reliable performance under system disturbances. On the other hand, the wavelet method shows better performance and it reflects robustness against these disturbances.
Advisors/Committee Members: Toliyat, Hamid (advisor), Ehsani, Mehrdad (committee member), Bhattacharyya, Shankar P. (committee member), Palazzolo, Alan (committee member).
Subjects/Keywords: synchronous generators; stator winding ground faults
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APA (6th Edition):
Al Jaafari, K. A. M. A. (2016). Electromagnetic Analysis of Stator Ground Faults in Synchronous Generators. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/158003
Chicago Manual of Style (16th Edition):
Al Jaafari, Khaled Ali Mohammed Ali. “Electromagnetic Analysis of Stator Ground Faults in Synchronous Generators.” 2016. Doctoral Dissertation, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/158003.
MLA Handbook (7th Edition):
Al Jaafari, Khaled Ali Mohammed Ali. “Electromagnetic Analysis of Stator Ground Faults in Synchronous Generators.” 2016. Web. 17 Apr 2021.
Vancouver:
Al Jaafari KAMA. Electromagnetic Analysis of Stator Ground Faults in Synchronous Generators. [Internet] [Doctoral dissertation]. Texas A&M University; 2016. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/158003.
Council of Science Editors:
Al Jaafari KAMA. Electromagnetic Analysis of Stator Ground Faults in Synchronous Generators. [Doctoral Dissertation]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/158003
Texas A&M University
6.
Algethami, Abdullah Ayedh B.
Regenerative Suspension System Modeling and Control.
Degree: PhD, Mechanical Engineering, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/173094
► Many energy indicators show an increase in the world’s energy deficit. Demand for portable energy sources is growing and has increased the market for energy…
(more)
▼ Many energy indicators show an increase in the world’s energy deficit. Demand for portable energy sources is growing and has increased the market for energy harvesters and regenerative systems. This work investigated the implementation of a regenerative suspension in a two-degree-of freedom (2-DOF) quarter-car suspension system. First, an active controller was designed and implemented. It showed 69% improvement in rider comfort and consumed 8 – 9 W of power to run the linear motor used in the experiment. A regenerative suspension system was then designed to save the energy normally spent in active suspensions, approximately several kilowatts in an actual car. Regenerative suspension is preferable because it can regenerate energy. Experimental investigations were then conducted to find generator constants and damping coefficients. Additionally, generator damping effects and power regeneration in the quarter-car test bed were also investigated. The experiments showed that a linear regenerative damper can suppress up to 22% of vibrations and harvest 2% of the disturbance power. Since both harvesting and damping capabilities were noticeable in this test bed, it was used to implement regenerative suspension, and a regenerative controller was developed to provide riders with additional comfort.
To implement this regenerative controller, an electronic interface was designed to facilitate controlling the regenerative force and storing energy after the rectification process. The electronic interface used was a symmetrical-bridgeless boost converter (SBBC) due to its few components and even fewer control efforts. The converter was then modeled in a manner that made the current and voltage in phase for the maximum power factor. The converter control allowed the motor’s external load to be presented as of variable resistance with the unity power factor. The generator was then considered a voltage source for energy regeneration purposes.
The controller was designed to control regenerative force at a frequency of 20 kHz. This frequency was sufficient to enable another controller to manipulate the desired regenerative damping force, which was chosen to be 1 kHz. The input to this controller was the generator voltage used to determine the polarity of pulse-width modulation (PWM). Therefore, a combination of converter and controller was able to take the place of an active controller. A different controller was then designed to manipulate the desired damping force.
This regenerative controller was designed in a manner similar to that of a semi-active controller. It improved vibration suppression and enhanced harvesting capabilities. The regenerative suspension showed better results than a passive suspension. The improvements are minimal at this time, but there is the potential for greater improvement with a more efficient controller. The harvested energy was so small in this experiment because the damper was inefficient. In practice, the damper’s efficiency should be improved. A regenerative damper will be more economical than a…
Advisors/Committee Members: Kim, Won-jong (advisor), Ehsani, Mehrdad (committee member), Palazzolo, Alan (committee member), Suh, Steve (committee member).
Subjects/Keywords: regenerative suspension; regenerative controller; active suspension; regenerative interface
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APA (6th Edition):
Algethami, A. A. B. (2017). Regenerative Suspension System Modeling and Control. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/173094
Chicago Manual of Style (16th Edition):
Algethami, Abdullah Ayedh B. “Regenerative Suspension System Modeling and Control.” 2017. Doctoral Dissertation, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/173094.
MLA Handbook (7th Edition):
Algethami, Abdullah Ayedh B. “Regenerative Suspension System Modeling and Control.” 2017. Web. 17 Apr 2021.
Vancouver:
Algethami AAB. Regenerative Suspension System Modeling and Control. [Internet] [Doctoral dissertation]. Texas A&M University; 2017. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/173094.
Council of Science Editors:
Algethami AAB. Regenerative Suspension System Modeling and Control. [Doctoral Dissertation]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/173094
Texas A&M University
7.
Wang, Xin.
Nonlinear Time-Frequency Control of Permanent Magnet Electrical Machines.
Degree: PhD, Mechanical Engineering, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/173106
► Permanent magnet (PM) electrical machines have been widely adopted in industrial applications due to their advantages such as easy to control, compact in size, low…
(more)
▼ Permanent magnet (PM) electrical machines have been widely adopted in
industrial applications due to their advantages such as easy to control, compact in size,
low in power loss, and fast in response, to name only a few. Contemporary control
methods specifically designed for the control of PM electrical machines only focus on
controlling their time-domain behaviors while completely ignored their frequency-domain
characteristics. Hence, when a PM electrical machine is highly nonlinear, none of them
performs well.
To make up for the drawback and hence improve the performance of PM electrical
machines under high nonlinearity, the novel nonlinear time-frequency control concept is
adopted to develop viable nonlinear control schemes for PM electrical machines. In this
research, three nonlinear time-frequency control schemes are developed for the speed and
position control of PM brushed DC motors, speed and position control of PM synchronous
motors, and chaos suppression of PM synchronous motors, respectively. The most
significant feature of the demonstrated control schemes are their ability in generating a
proper control effort that controls the system response in both the time and frequency
domains. Simulation and experiment results have verified the effectiveness and superiority
of the presented control schemes. The nonlinear time-frequency control scheme is
therefore believed to be suitable for PM electrical machine control and is expected to have
a positive impact on the broader application of PM electrical machines.
Advisors/Committee Members: Suh, C. Steve (advisor), Palazzolo, Alan (committee member), Ehsani, Mehrdad (committee member), Langari, Reza (committee member).
Subjects/Keywords: PM electrical machines; nonlinear control; discrete wavelet transformation; adaptive control
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APA (6th Edition):
Wang, X. (2017). Nonlinear Time-Frequency Control of Permanent Magnet Electrical Machines. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/173106
Chicago Manual of Style (16th Edition):
Wang, Xin. “Nonlinear Time-Frequency Control of Permanent Magnet Electrical Machines.” 2017. Doctoral Dissertation, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/173106.
MLA Handbook (7th Edition):
Wang, Xin. “Nonlinear Time-Frequency Control of Permanent Magnet Electrical Machines.” 2017. Web. 17 Apr 2021.
Vancouver:
Wang X. Nonlinear Time-Frequency Control of Permanent Magnet Electrical Machines. [Internet] [Doctoral dissertation]. Texas A&M University; 2017. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/173106.
Council of Science Editors:
Wang X. Nonlinear Time-Frequency Control of Permanent Magnet Electrical Machines. [Doctoral Dissertation]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/173106
Texas A&M University
8.
Harris, William Robert.
Sustainable Rural Microgrid: Engineering and Economics.
Degree: MS, Electrical Engineering, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/165748
► Traditional electrification strategies focused on centralized grid expansion are financially infeasible for extending electricity connections to millions of rural households in developing countries. Instead, estimates…
(more)
▼ Traditional electrification strategies focused on centralized grid expansion are financially infeasible for extending electricity connections to millions of rural households in developing countries. Instead, estimates predict mini-utilities and off-grid approaches will need to provide electricity to at least 154 million households if universal electrification is to be reached by the target of 2030 set by the United Nations’ Sustainable Energy for All Initiative. Additionally, the large populations within developing countries and predictions of future electricity consumption suggest that fossil fuel-based electrification strategies for these countries would vastly increase the volume of greenhouse gas (GHG) emissions per annum and should be avoided. Renewable technologies such as photovoltaic (PV) arrays, wind turbines, and biomass gasifiers provide sustainable energy alternatives. With the advent of such renewable technologies, DC microgrids are increasingly advantageous compared to AC systems in rural applications, predominantly due to the reduction of AC to DC power conversions and native DC tendency of loads. A holistic methodological approach to designing a miniutility is described in this thesis, including technical, financial, and managerial considerations.
Microgrid architecture topologies are proposed in this thesis, including photovoltaic, biomass gasifier, and wind turbine generators as well as generator hybridization topologies. Rural systems have unique design challenges due to their consumers’ low purchasing power, sparse population density, minimal power consumption and tendency for slow growth. Sizing generators appropriately is paramount. In many cases, detailed renewable resource data may be unavailable, a condition taken into consideration by utilizing publicly available low-resolution global climate datasets from NASA for generator sizing purposes. Power converter topologies are also briefly discussed. As an example, a microgrid topology and business model is constructed for a model village case study using the methodology and architectures described in this thesis. The results of the case study highlight the limitations of minimizing net preset cost as an optimization objective and instead propose maximum average cost to period as an alternative metric for comparison. Additionally, longer loan periods are found to favor capital-intensive microgrid architecture, such as solar and wind technologies.
Advisors/Committee Members: Ehsani, Mehrdad (advisor), Kish, Laszlo (committee member), Xie, Le (committee member), Allaire, Douglas (committee member).
Subjects/Keywords: Rural electrification; microgrid; micro grid; Sustainable energy; renewable energy
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APA (6th Edition):
Harris, W. R. (2017). Sustainable Rural Microgrid: Engineering and Economics. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/165748
Chicago Manual of Style (16th Edition):
Harris, William Robert. “Sustainable Rural Microgrid: Engineering and Economics.” 2017. Masters Thesis, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/165748.
MLA Handbook (7th Edition):
Harris, William Robert. “Sustainable Rural Microgrid: Engineering and Economics.” 2017. Web. 17 Apr 2021.
Vancouver:
Harris WR. Sustainable Rural Microgrid: Engineering and Economics. [Internet] [Masters thesis]. Texas A&M University; 2017. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/165748.
Council of Science Editors:
Harris WR. Sustainable Rural Microgrid: Engineering and Economics. [Masters Thesis]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/165748
Texas A&M University
9.
Wang, Yang.
An Investigation of Optimal Design of Hybrid Electric Vehicle with a Starrotor Engine.
Degree: PhD, Electrical Engineering, 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/174217
► Fuel economy of conventional hybrid electric vehicles (HEVs) gets limited improvements because of constraints from conventional internal combustion engines (ICEs). Electric vehicles (EVs) have the…
(more)
▼ Fuel economy of conventional hybrid electric vehicles (HEVs) gets limited improvements because of constraints from conventional internal combustion engines (ICEs). Electric vehicles (EVs) have the disadvantage of requiring large battery packs onboard. To overcome these problems, an HEV with a StarRotor Engine to replace the conventional ICE as the main power plant, which allows for a small battery pack, is proposed. The goal of this research is to develop an optimal design for the StarRotor Engine–based hybrid electric vehicle (SR–HEV) with minimal battery pack. The three most popular hybrid electric drivetrains are parallel, series and series–parallel, and each is studied in this research. All of them are fully analyzed for the purpose of maximally enhancing fuel economy.
A dynamic programming algorithm for optimal control of a dynamic model is implemented. The optimal control associated with the energy management is solved explicitly for each virtual hybrid electric drivetrain. The solution of the optimal control problem shows how optimal energy management strategies are derived. The same process is applied to conventional ICE HEVs to get the fuel economy to compare with SR–HEVs. The simulation indicates that the SR–HEVs can significantly increase vehicle fuel economy, and a series-parallel hybrid electric drivetrain with electric variable transmission (EVT) can provide better fuel economy among those drivetrains. An optimal design methodology is also presented for SR-HEVs in regards to fuel economy. A parametric study shows that the appropriate gear ratios can further improve the fuel economy for the SR–HEV with EVT.
Advisors/Committee Members: Ehsani, Mehrdad (advisor), Holtzapple, Mark (committee member), Bhattacharyya , Shankar (committee member), Xie, Le (committee member).
Subjects/Keywords: Hybrid Electric Vehicle; Dynamic Programming; StarRotor engine; Optimal Design
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APA (6th Edition):
Wang, Y. (2015). An Investigation of Optimal Design of Hybrid Electric Vehicle with a Starrotor Engine. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/174217
Chicago Manual of Style (16th Edition):
Wang, Yang. “An Investigation of Optimal Design of Hybrid Electric Vehicle with a Starrotor Engine.” 2015. Doctoral Dissertation, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/174217.
MLA Handbook (7th Edition):
Wang, Yang. “An Investigation of Optimal Design of Hybrid Electric Vehicle with a Starrotor Engine.” 2015. Web. 17 Apr 2021.
Vancouver:
Wang Y. An Investigation of Optimal Design of Hybrid Electric Vehicle with a Starrotor Engine. [Internet] [Doctoral dissertation]. Texas A&M University; 2015. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/174217.
Council of Science Editors:
Wang Y. An Investigation of Optimal Design of Hybrid Electric Vehicle with a Starrotor Engine. [Doctoral Dissertation]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/174217
Texas A&M University
10.
Kang, Taeyong.
Smart Distribution Transformer for Smart Grid.
Degree: MS, Electrical Engineering, 2016, Texas A&M University
URL: http://hdl.handle.net/1969.1/156878
► In this thesis, a smart distribution transformer which improves power quality in the electrical power distribution grid is discussed. The proposed system is comprised of…
(more)
▼ In this thesis, a smart distribution transformer which improves power quality in the electrical power distribution grid is discussed. The proposed system is comprised of an existing line frequency (LF) distribution transformer connected to a power electronic module that is ‘auto-connected’ on the secondary side. The auto-connection is facilitated by utilizing a high-frequency (HF) / medium frequency (MF) transformer in the power electronics module. A simplified method to compensate for voltage sags and swells on the grid side by providing continuous ac voltage regulation is presented. When a voltage sag and swell event occurs, the power electronic module generates a compensating voltage which is vector-added to the grid voltage in order to supply the regulated output voltage to the load. The smart distribution transformer will satisfy the various needs of the present and future distribution smart grid such as improved availability, equipment protection, and resilience. In this thesis, detailed analysis, simulation and experimental results are discussed to validate the proposed smart distribution transformer.
Advisors/Committee Members: Enjeti, Prasad (advisor), Bhattacharyya, Shankar (committee member), Ehsani, Mehrdad (committee member), Xie, Zhizhang (committee member).
Subjects/Keywords: partial power processing; phase-shift modulation; power electronic transformer; voltage sag and swell compensation
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APA (6th Edition):
Kang, T. (2016). Smart Distribution Transformer for Smart Grid. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/156878
Chicago Manual of Style (16th Edition):
Kang, Taeyong. “Smart Distribution Transformer for Smart Grid.” 2016. Masters Thesis, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/156878.
MLA Handbook (7th Edition):
Kang, Taeyong. “Smart Distribution Transformer for Smart Grid.” 2016. Web. 17 Apr 2021.
Vancouver:
Kang T. Smart Distribution Transformer for Smart Grid. [Internet] [Masters thesis]. Texas A&M University; 2016. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/156878.
Council of Science Editors:
Kang T. Smart Distribution Transformer for Smart Grid. [Masters Thesis]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/156878
Texas A&M University
11.
Mohammad, Muneer.
An Investigation of Multi-Domain Energy Dynamics.
Degree: PhD, Electrical Engineering, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/152720
► This research investigates common patterns in all energy systems to develop insights and a clearer understanding of energy conversion and transmissions. The potential benefits of…
(more)
▼ This research investigates common patterns in all energy systems to develop
insights and a clearer understanding of energy conversion and transmissions. The
potential benefits of this research are to introduce conceptual models of power
conversions that can suggest new power conversion machines, understand some known
physical laws, and propose new laws of energy dynamics.
The electromagnetic domain is used as an archetype domain since it is the most
completely developed and well-documented domain. In this research, an extensive study
for the electromagnetic domain and the comparisons between other domains are
presented. The work is based on the fact that in all energy engineering systems, the
variables to transmit power are similar in functionality. Power can only exist when
energy transfers and mutates in space. However, moving in space requires flow, and that
flow cannot happen without effort. This work also presents the importance of power
conversion through media.
In order to connect all energy systems together, some variables should be defined
in all existing energy systems. Some of these variables are defined in the literature, such
as electrical, but the others are not, such as the thermal and magnetic systems.
A comparison between the new approach and the other existing models is
presented in order to highlight the differences between the conventional and proposed
one. Finally, theoretical verifications and explanations of some concepts are presented in this research in a better and more powerful way to validate our theory.
Advisors/Committee Members: Ehsani, Mehrdad (advisor), Kish, Laszlo (committee member), Xie, Le (committee member), Kim, Eun (committee member).
Subjects/Keywords: Energy Dynamics; power conversions; electromagnetic domain; archetype; energy systems; Patterns
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APA (6th Edition):
Mohammad, M. (2014). An Investigation of Multi-Domain Energy Dynamics. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/152720
Chicago Manual of Style (16th Edition):
Mohammad, Muneer. “An Investigation of Multi-Domain Energy Dynamics.” 2014. Doctoral Dissertation, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/152720.
MLA Handbook (7th Edition):
Mohammad, Muneer. “An Investigation of Multi-Domain Energy Dynamics.” 2014. Web. 17 Apr 2021.
Vancouver:
Mohammad M. An Investigation of Multi-Domain Energy Dynamics. [Internet] [Doctoral dissertation]. Texas A&M University; 2014. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/152720.
Council of Science Editors:
Mohammad M. An Investigation of Multi-Domain Energy Dynamics. [Doctoral Dissertation]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/152720
Texas A&M University
12.
Guerrero, Roberto.
Low-cost Rigid-frame Exoskeleton Glove with Finger-joint Flexion Tracking Mapped onto a Robotic Hand.
Degree: MS, Mechanical Engineering, 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/155298
► This thesis provides a representation of a low-cost rigid-frame exoskeleton glove that is used to track finger-joint flexion mapped onto a robotic hand to mimic…
(more)
▼ This thesis provides a representation of a low-cost rigid-frame exoskeleton glove that is used to track finger-joint flexion mapped onto a robotic hand to mimic user movements. The overall setup consists of an exoskeleton glove (exo-glove), sensors, a microcontroller, and a telerobotic hand. The design of the exo-glove is crafted to fit onto a left hand. SolidWorks was used for the prototype designs which were then sent to the Stratasys 400 rapid prototyping machine to be 3D printed in ABS-M30 plastic.
The exo-glove houses five rotary position sensors and three flexible sensors to track angle changes of the finger joints from two fingers and a thumb. Five low-pass filters are implemented as signal filtering for the rotary position sensors. An Arduino Mega microcontroller is connected to the sensors of the exo-glove and processes the input values. Using an open-loop controller to control the robotic hand, the values processed by the microcontroller from the exo-glove are sent to the servo motors on the robotic hand to operate the corresponding fingers of the user.
Throughout the initial calibration and testing phase, each sensor was tested individually to ensure the sensor functionally performs well. Signal analysis was conducted on the sensors at steady state and while in operation to show fluctuations in sensor readings and response to finger flexion. Experimental results show that averaging sensor data in the processing code yields smoother values and better precision. Due to the use of low-pass filtering with the rotary position sensors, the data sets collected were grouped together tightly compared to the flex sensors without filtering. However, the actual angles measured were not accurately portrayed in sensor readings. The true flexion angles were compared in the data samplings to find a variety of ranges spanning around the angles desired to track. Many of the actual flexion angles were offset from the sensor readings by a variation of degrees, but the data shows the sensor readings were able to follow the general magnitude of the true flexion angles.
The precision seen in the data was also apparent in the robotic hand mirroring the posture. Changes in sensor readings caused jerking movements to occur in the robotic fingers but were able to maintain an overall flexion mirroring of the RF exo-glove. There is quarter-second delay between the exo-glove sensor reading and the robotic hand mirroring capability when not implementing averaging. When averaging the sensor values, there was a delay of more than half a second between the exo-glove posture and robotic hand mirroring.
Advisors/Committee Members: Kim, Won-jong (advisor), Ehsani, Mehrdad (committee member), McAdams, Daniel (committee member).
Subjects/Keywords: exo-glove; exoskeleton glove; flex sensors; rotary position sensors; rigid frame glove; finger flexion tracking; hand tracking; hand rehabilitation; finger rehabilitation
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APA ·
Chicago ·
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Export
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APA (6th Edition):
Guerrero, R. (2015). Low-cost Rigid-frame Exoskeleton Glove with Finger-joint Flexion Tracking Mapped onto a Robotic Hand. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155298
Chicago Manual of Style (16th Edition):
Guerrero, Roberto. “Low-cost Rigid-frame Exoskeleton Glove with Finger-joint Flexion Tracking Mapped onto a Robotic Hand.” 2015. Masters Thesis, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/155298.
MLA Handbook (7th Edition):
Guerrero, Roberto. “Low-cost Rigid-frame Exoskeleton Glove with Finger-joint Flexion Tracking Mapped onto a Robotic Hand.” 2015. Web. 17 Apr 2021.
Vancouver:
Guerrero R. Low-cost Rigid-frame Exoskeleton Glove with Finger-joint Flexion Tracking Mapped onto a Robotic Hand. [Internet] [Masters thesis]. Texas A&M University; 2015. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/155298.
Council of Science Editors:
Guerrero R. Low-cost Rigid-frame Exoskeleton Glove with Finger-joint Flexion Tracking Mapped onto a Robotic Hand. [Masters Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155298
Texas A&M University
13.
Lai, Lin.
A Development of Design and Control Methodology for Next Generation Parallel Hybrid Electric Vehicle.
Degree: PhD, Electrical Engineering, 2013, Texas A&M University
URL: http://hdl.handle.net/1969.1/149289
► Commercially available Hybrid Electric Vehicles (HEVs) have been around for more than ten years. However, their market share remains small. Focusing only on the improvement…
(more)
▼ Commercially available Hybrid Electric Vehicles (HEVs) have been around for more than ten years. However, their market share remains small. Focusing only on the improvement of fuel economy, the design tends to reduce the size of the internal combustion engine in the HEV, and uses the electrical drive to compensate for the power gap between the load demand and the engine capacity. Unfortunately, the low power density and the high cost of the combined electric motor drive and battery packs dictate that the HEV has either worse performance or much higher price than the conventional vehicle. In this research, a new design philosophy for parallel HEV is proposed, which uses a full size engine to guarantee the vehicle performance at least as good as the conventional vehicle, and hybridizes with an electrical drive in parallel to improve the fuel economy and performance beyond the conventional cars. By analyzing the HEV fuel economy versus the increasing of the electrical drive power on typical driving conditions, the optimal hybridization electric power capacity is determined. Thus, the full size engine HEV shows significant improvement in fuel economy and performance, with relatively short cost recovery period.
A new control strategy, which optimizes the fuel economy of parallel configured charge sustained hybrid electric vehicles, is proposed in the second part of this dissertation. This new approach is a constrained engine on-off strategy, which has been developed from the two extreme control strategies of maximum SOC and engine on-off, by taking their advantages and overcoming their disadvantages. A system optimization program using dynamic programming algorithm has been developed to calibrate the control parameters used in the developed control strategy, so that the control performance can be as close to the optimal solution as possible. In order to determine the sensitivity of the new control strategy to different driving conditions, a passenger car is simulated on different driving cycles. The performances of the vehicle with the new control strategy are compared with the optimal solution obtained on each driving condition with the dynamic programming optimization. The simulation result shows that the new control strategy always keeps its performance close to the optimal one, as the driving condition changes.
Advisors/Committee Members: Ehsani, Mehrdad (advisor), Singh, Chanan (committee member), Bhattacharyya, Shankar (committee member), Kim, Won-jong (committee member).
Subjects/Keywords: Control strategy; Dynamic programming; Hybrid electric vehicle
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APA ·
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Export
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Manager
APA (6th Edition):
Lai, L. (2013). A Development of Design and Control Methodology for Next Generation Parallel Hybrid Electric Vehicle. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/149289
Chicago Manual of Style (16th Edition):
Lai, Lin. “A Development of Design and Control Methodology for Next Generation Parallel Hybrid Electric Vehicle.” 2013. Doctoral Dissertation, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/149289.
MLA Handbook (7th Edition):
Lai, Lin. “A Development of Design and Control Methodology for Next Generation Parallel Hybrid Electric Vehicle.” 2013. Web. 17 Apr 2021.
Vancouver:
Lai L. A Development of Design and Control Methodology for Next Generation Parallel Hybrid Electric Vehicle. [Internet] [Doctoral dissertation]. Texas A&M University; 2013. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/149289.
Council of Science Editors:
Lai L. A Development of Design and Control Methodology for Next Generation Parallel Hybrid Electric Vehicle. [Doctoral Dissertation]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/149289
Texas A&M University
14.
Farrokhzadershad, Nima.
Development of Dual Shaft Electric Motor with Independent Input-Output Torque-Speed for Vehicle Kinetic Energy Recovery Systems.
Degree: PhD, Electrical Engineering, 2018, Texas A&M University
URL: http://hdl.handle.net/1969.1/188936
► This study is about development of a new family of electric machines with two mechanical and one/two electrical ports (Transmotors). These machines remove the limitations…
(more)
▼ This study is about development of a new family of electric machines with two mechanical
and one/two electrical ports (Transmotors). These machines remove the limitations of the
conventional one shaft machines such as in EV & HEV vehicles. In particular, the kinetic energy
recovery application of Transmotors has been considered in this study. Transmotor-based flywheel
energy exchange is a low cost, yet highly efficient method of energy transfer between vehicle
wheels and a lightweight flywheel. This method utilizes one dual-rotor electric machine that
enables us to overcome some of the shortcomings of the conventional electric kinetic energy
recovery systems (KERS).The proposed system is capable of capturing far more mechanical power
than its electrical power ratings. Furthermore, since a significant part of the energy exchange takes
place in mechanical form, only a small fraction of the initial kinetic energy needs to be processed
by the electrical energy storage device and the power electronic drive system. In this study, the
proposed Transmotor-based KERS has been compared with the conventional electric KERS.
Mathematical modeling and computer simulations were performed using space vector modeling
method for both conventional electric KERS and the proposed system. Results show that the
proposed system is capable of capturing a great part of kinetic energy of a vehicle during
deceleration and storing it in a lightweight flywheel to be used for the next acceleration while
keeping the electrical ratings of the KERS relatively low. Experimental results are also presented
for the proof of the concept.
Advisors/Committee Members: Ehsani, Mehrdad (advisor), Bhattacharyya, Shankar (committee member), Xie, Le (committee member), Langari, Reza (committee member).
Subjects/Keywords: Flywheel; Kinetic Energy Recovery; Electric Vehicle; Transmotor
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Farrokhzadershad, N. (2018). Development of Dual Shaft Electric Motor with Independent Input-Output Torque-Speed for Vehicle Kinetic Energy Recovery Systems. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/188936
Chicago Manual of Style (16th Edition):
Farrokhzadershad, Nima. “Development of Dual Shaft Electric Motor with Independent Input-Output Torque-Speed for Vehicle Kinetic Energy Recovery Systems.” 2018. Doctoral Dissertation, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/188936.
MLA Handbook (7th Edition):
Farrokhzadershad, Nima. “Development of Dual Shaft Electric Motor with Independent Input-Output Torque-Speed for Vehicle Kinetic Energy Recovery Systems.” 2018. Web. 17 Apr 2021.
Vancouver:
Farrokhzadershad N. Development of Dual Shaft Electric Motor with Independent Input-Output Torque-Speed for Vehicle Kinetic Energy Recovery Systems. [Internet] [Doctoral dissertation]. Texas A&M University; 2018. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/188936.
Council of Science Editors:
Farrokhzadershad N. Development of Dual Shaft Electric Motor with Independent Input-Output Torque-Speed for Vehicle Kinetic Energy Recovery Systems. [Doctoral Dissertation]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/188936
Texas A&M University
15.
Farrokhzadershad, Nima.
Development of Dual Shaft Electric Motor with Independent Input-Output Torque-Speed for Vehicle Kinetic Energy Recovery Systems.
Degree: PhD, Electrical Engineering, 2018, Texas A&M University
URL: http://hdl.handle.net/1969.1/188935
► This study is about development of a new family of electric machines with two mechanical and one/two electrical ports (Transmotors). These machines remove the limitations…
(more)
▼ This study is about development of a new family of electric machines with two mechanical
and one/two electrical ports (Transmotors). These machines remove the limitations of the
conventional one shaft machines such as in EV & HEV vehicles. In particular, the kinetic energy
recovery application of Transmotors has been considered in this study. Transmotor-based flywheel
energy exchange is a low cost, yet highly efficient method of energy transfer between vehicle
wheels and a lightweight flywheel. This method utilizes one dual-rotor electric machine that
enables us to overcome some of the shortcomings of the conventional electric kinetic energy
recovery systems (KERS).The proposed system is capable of capturing far more mechanical power
than its electrical power ratings. Furthermore, since a significant part of the energy exchange takes
place in mechanical form, only a small fraction of the initial kinetic energy needs to be processed
by the electrical energy storage device and the power electronic drive system. In this study, the
proposed Transmotor-based KERS has been compared with the conventional electric KERS.
Mathematical modeling and computer simulations were performed using space vector modeling
method for both conventional electric KERS and the proposed system. Results show that the
proposed system is capable of capturing a great part of kinetic energy of a vehicle during
deceleration and storing it in a lightweight flywheel to be used for the next acceleration while
keeping the electrical ratings of the KERS relatively low. Experimental results are also presented
for the proof of the concept.
Advisors/Committee Members: Ehsani, Mehrdad (advisor), Bhattacharyya, Shankar (committee member), Xie, Le (committee member), Langari, Reza (committee member).
Subjects/Keywords: Flywheel; Kinetic Energy Recovery; Electric Vehicle; Transmotor
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Farrokhzadershad, N. (2018). Development of Dual Shaft Electric Motor with Independent Input-Output Torque-Speed for Vehicle Kinetic Energy Recovery Systems. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/188935
Chicago Manual of Style (16th Edition):
Farrokhzadershad, Nima. “Development of Dual Shaft Electric Motor with Independent Input-Output Torque-Speed for Vehicle Kinetic Energy Recovery Systems.” 2018. Doctoral Dissertation, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/188935.
MLA Handbook (7th Edition):
Farrokhzadershad, Nima. “Development of Dual Shaft Electric Motor with Independent Input-Output Torque-Speed for Vehicle Kinetic Energy Recovery Systems.” 2018. Web. 17 Apr 2021.
Vancouver:
Farrokhzadershad N. Development of Dual Shaft Electric Motor with Independent Input-Output Torque-Speed for Vehicle Kinetic Energy Recovery Systems. [Internet] [Doctoral dissertation]. Texas A&M University; 2018. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/188935.
Council of Science Editors:
Farrokhzadershad N. Development of Dual Shaft Electric Motor with Independent Input-Output Torque-Speed for Vehicle Kinetic Energy Recovery Systems. [Doctoral Dissertation]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/188935
Texas A&M University
16.
Dogan, Yusuf.
Mm Scale 3d Silica Waveguide Fabrication Technique for Solar Energy Concentration Systems.
Degree: PhD, Electrical Engineering, 2018, Texas A&M University
URL: http://hdl.handle.net/1969.1/192045
► The overreaching goal of this dissertation research is to achieve fabrication of mm scale waveguide structure for solar energy concentration systems. In the proposed design,…
(more)
▼ The overreaching goal of this dissertation research is to achieve fabrication of mm scale waveguide structure for solar energy concentration systems. In the proposed design, a high concentrator photovoltaics (HCPV) with 1000x concentration and >90 % optical efficiency is targeted. The concept consists of three components: lens array, coupler and waveguiding section. Fused silica is assigned as the waveguide material, since it has a high optical transmission and low absorption and it provides the scalability and low manufacturing cost sought in the fabrication technique. To acquire the desired shape in waveguide, femtosecond laser irradiation followed by chemical etching (FLICE) process is used for fused silica light pipes fabrication. Among two widely used etchants potassium hydroxide (KOH) is preferred over hydrogen fluoride (HF) regarding its higher selectivity. FLICE process parameters have been optimized to achieve higher selectivity, higher manufacturing speed and better surface quality. The minimum number of overlapped pulses is reduced to 3.2 which corresponds to 1.25
m/s writing speed at given 2 MHz laser pulse repetition rate at given 2 μ
m spot size and an acceptable filtered surface roughness of 400 nm for 1 mm
2 area is achieved. The achieved minimum filtered surface roughness is scaled down to 21.8 nm for given 1 mm
2 area. Up to 1X5 staggered and tapered light pipes with up to 12.75x geometric concentration factor with a 45° angled input facet is successfully fabricated. The achieved accuracy of the angled surfaces is smaller than ±0.5° and ±0.01° for 45° and side wall tapered surfaces, respectively. Having evaluated the polishing techniques, CO2 laser polishing is decided to be employed in this study to obtain a smooth surface finish. Surface profiles are measured by atomic force microscopy (AFM) for generally high spatial frequency analysis and
white light interferometry (WLI) for low spatial frequency analysis. Measurements demonstrate that the surface root mean square (RMS) roughness is decreased almost two order of magnitude. 95% transmission efficiency is measured for waveguide samples up to 50 mm in length and 1 mm
2 cross sectional area when the Fresnel losses are ignored and incident angles (in air) are averaged according to F/1.5 lens. Complex shapes in waveguides such as angled facets, tapering of the cross-section along the length, and combiners are proven to be possible to fabricate with high precision.
Advisors/Committee Members: Madsen, Christi K (advisor), Eknoyan, Ohannes (committee member), Ehsani, Mehrdad (committee member), Belyanin, Alexey (committee member).
Subjects/Keywords: HCPV; light pipe; FLICE; Fs laser
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Dogan, Y. (2018). Mm Scale 3d Silica Waveguide Fabrication Technique for Solar Energy Concentration Systems. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/192045
Chicago Manual of Style (16th Edition):
Dogan, Yusuf. “Mm Scale 3d Silica Waveguide Fabrication Technique for Solar Energy Concentration Systems.” 2018. Doctoral Dissertation, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/192045.
MLA Handbook (7th Edition):
Dogan, Yusuf. “Mm Scale 3d Silica Waveguide Fabrication Technique for Solar Energy Concentration Systems.” 2018. Web. 17 Apr 2021.
Vancouver:
Dogan Y. Mm Scale 3d Silica Waveguide Fabrication Technique for Solar Energy Concentration Systems. [Internet] [Doctoral dissertation]. Texas A&M University; 2018. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/192045.
Council of Science Editors:
Dogan Y. Mm Scale 3d Silica Waveguide Fabrication Technique for Solar Energy Concentration Systems. [Doctoral Dissertation]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/192045
Texas A&M University
17.
Sabeeh, Sinan Asaad.
Power Electronics Topologies for Solar Photovoltiac Energy System Applications.
Degree: PhD, Electrical Engineering, 2018, Texas A&M University
URL: http://hdl.handle.net/1969.1/174496
► Owing to economic aspects, Central inverter is the dominating candidate in large-scale PV installations despite its lower energy harvest compared to other topologies like string…
(more)
▼ Owing to economic aspects, Central inverter is the dominating candidate in large-scale PV installations despite its lower energy harvest compared to other topologies like string inverters especially under partial shading conditions. This dissertation focuses on developing a new fractional rated converter to harvest maximum power point from PV systems for different environmental conditions e.g. dust, temperature, and shading effects. The first approach emphasizes on balancing the voltages from different strings in a PV farm and ensure higher energy yield from central inverters. The voltage approach balancing has a higher efficiency and energy density at lower cost. A new MPPT algorithm has been designed and tested through simulation to conform the functionality of the proposed topology.
The second approach is an extension to voltage balancing topology to develop based on it a complete energy harvesting system that balances the voltage and current from the non-linear source which is the PV. The two-stage converter characterized by the fractional power rating, high efficiency, scalability and lower cost of the energy produced. The approach is designed for PV strings with voltage of 1500V DC to achieve maximum power point tracking (MPPT) through the fractionally rated stages mitigating the effects of environmental conditions. The proposed system is shown to be scalable to suite large-scale solar PV power plants. A design example of 1.1 MW PV power and lab-prototype of 400 W has been built to validate the proposed concept.
The third part theme investigated a dual phase output inverter actively decouples the double line frequency harmonics integrated with power optimizer. The inverter employs a half bridge with passive elements (L-C) to balance the output to actively decouple the double line frequency. The closed loop control adjusts for varying load conditions. Further, an integrated power optimizer (PO) provides interface of solar-pv and battery to the dc-link. The PO stage (half bridge) is
controlled such that maximum power point tracking (MPPT) is achieved for the connected pv-array and independent charge/discharge functions of the battery. Simulation and experimental results verify the performance of the proposed technique under balanced, unbalanced load, non-linear conditions as well as fault condition.
Advisors/Committee Members: Enjeti, Prasad (advisor), Ehsani, Mehrdad (committee member), Madsen, Christi (committee member), Mohtar, Rabi (committee member).
Subjects/Keywords: PV system; fractional rated converter; active decoupling; large scale PV; solar energy
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APA (6th Edition):
Sabeeh, S. A. (2018). Power Electronics Topologies for Solar Photovoltiac Energy System Applications. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/174496
Chicago Manual of Style (16th Edition):
Sabeeh, Sinan Asaad. “Power Electronics Topologies for Solar Photovoltiac Energy System Applications.” 2018. Doctoral Dissertation, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/174496.
MLA Handbook (7th Edition):
Sabeeh, Sinan Asaad. “Power Electronics Topologies for Solar Photovoltiac Energy System Applications.” 2018. Web. 17 Apr 2021.
Vancouver:
Sabeeh SA. Power Electronics Topologies for Solar Photovoltiac Energy System Applications. [Internet] [Doctoral dissertation]. Texas A&M University; 2018. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/174496.
Council of Science Editors:
Sabeeh SA. Power Electronics Topologies for Solar Photovoltiac Energy System Applications. [Doctoral Dissertation]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/174496
Texas A&M University
18.
Ekin, Muhammed Emin.
Thermal Modeling of Photovoltaic Modules for Reliability Assessment of Single-Phase Module-Integrated Power Electronics in Turkey.
Degree: MS, Electrical Engineering, 2018, Texas A&M University
URL: http://hdl.handle.net/1969.1/173394
► Renewable energy sources, especially those providing solar energy, are currently some of the fastest growing energy sources in the world. Both academia and the corporate…
(more)
▼ Renewable energy sources, especially those providing solar energy, are currently some of the fastest growing energy sources in the world. Both academia and the corporate world have invested in this technology to decrease the cost and increase the performance, efficiency, and reliability of photovoltaic (PV) modules. Though research is ongoing, there are certain meteorological parameters that affect the overall module temperature which may adversely impact the performance, efficiency, and reliability of the renewable energy system. Increases in temperature are responsible for many of the failures and degradations reported in PV modules. For many PV materials, like silicon-based PV cells which account for 90% of the current market, increasing the module temperature decreases the conversion efficiency, which decreases the amount of electrical energy produced. Thus, module temperature plays a crucial role in the overall photovoltaic energy conversion process. The datasheets for photovoltaic modules consider only a small range of operating conditions that are the standard test condition (STC) and the normal operating cell temperature (NOCT), despite the modules being required to function in an extensive range of conditions and variety of situations. Thus, accurately understanding PV module temperature via thermal modeling is essential to calculating module performance, efficiency, and reliability. In thermal modeling, environmental conditions affect electrical stresses and component thermal behavior, so reliable calculations are necessary to understand the operating points. In this regard, the broader impact of this research is to model a methodology and tool by which users, researchers, and manufacturers can evaluate candidate PV technologies for power conversion, energy harvesting, and reliability determination. In the current research, this method has been applied to certain regions of Turkey. This avoided requiring expensive and time-consuming testbeds and long-term data logging. However, this improved methodology could be applied to other regions around the world.
Advisors/Committee Members: Balog, Robert S (advisor), Bhattacharyya, Shankar P (committee member), Ehsani, Mehrdad (committee member), Capar, Ismail (committee member).
Subjects/Keywords: thermal modeling; reliability; Turkey Solar Energy; module integrated micro inverter
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APA (6th Edition):
Ekin, M. E. (2018). Thermal Modeling of Photovoltaic Modules for Reliability Assessment of Single-Phase Module-Integrated Power Electronics in Turkey. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/173394
Chicago Manual of Style (16th Edition):
Ekin, Muhammed Emin. “Thermal Modeling of Photovoltaic Modules for Reliability Assessment of Single-Phase Module-Integrated Power Electronics in Turkey.” 2018. Masters Thesis, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/173394.
MLA Handbook (7th Edition):
Ekin, Muhammed Emin. “Thermal Modeling of Photovoltaic Modules for Reliability Assessment of Single-Phase Module-Integrated Power Electronics in Turkey.” 2018. Web. 17 Apr 2021.
Vancouver:
Ekin ME. Thermal Modeling of Photovoltaic Modules for Reliability Assessment of Single-Phase Module-Integrated Power Electronics in Turkey. [Internet] [Masters thesis]. Texas A&M University; 2018. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/173394.
Council of Science Editors:
Ekin ME. Thermal Modeling of Photovoltaic Modules for Reliability Assessment of Single-Phase Module-Integrated Power Electronics in Turkey. [Masters Thesis]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/173394
Texas A&M University
19.
Abdullah, Ahmad Muhammad.
A New Solution for Improving Transmission Line Distance Protection Security During System-Wide Cascading Failures.
Degree: PhD, Electrical Engineering, 2018, Texas A&M University
URL: http://hdl.handle.net/1969.1/173579
► Protection misoperation is responsible for a large portion of all cascading failures. These cascading failures can lead to blackouts that have tremendous social impacts. This…
(more)
▼ Protection misoperation is responsible for a large portion of all cascading failures. These cascading failures can lead to blackouts that have tremendous social impacts. This dissertation proposes a new method that uses local distance relay instantaneous three-phase currents to enhance the security of distance protection of transmission lines during wide-area cascading events. The method incorporates advanced signal processing techniques and pattern recognition approaches to prevent zone 3 distance protection misoperation.
Prevention of misoperation is done through three major stages. The first stage is fault detection. In this first stage, the proposed method merely recognizes that a fault exists somewhere in the transmission system. The second stage determines whether this fault is within the distance relay’s protective reach. The last stage detects whether this fault has been cleared. If the second stage determines that the fault is outside the zone 3 reach of the relay, a blocking signal will be sent to the relay to prevent operation even if the impedance falls within the operating characteristics of the relay. Alternatively, if the second stage determines that the fault is indeed within zone 3 protection reach of the relay, a permissive trip signal will be sent to the relay only if the third stage determines that the fault has not been cleared yet.
The first and second stages use three different k-nearest neighbor classifiers that are trained using level 3 detail coefficients of discrete wavelet transform of the aerial mode currents. The third stage uses the current fundamental to detect fault clearing.
Several wide area cascading scenarios were simulated, and various performance metrics were analyzed to study the effectiveness of the proposed methodology.
Advisors/Committee Members: Butler-Purry, Karen (advisor), Ward, Joseph (committee member), Ehsani, Mehrdad (committee member), Kumar, Panganamala (committee member), El-Halwagi, Mahmoud (committee member).
Subjects/Keywords: distance relaying; machine learning; pattern recognition; zone 3 protection; wide area cascading failures; blackouts; faults; lightning
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APA (6th Edition):
Abdullah, A. M. (2018). A New Solution for Improving Transmission Line Distance Protection Security During System-Wide Cascading Failures. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/173579
Chicago Manual of Style (16th Edition):
Abdullah, Ahmad Muhammad. “A New Solution for Improving Transmission Line Distance Protection Security During System-Wide Cascading Failures.” 2018. Doctoral Dissertation, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/173579.
MLA Handbook (7th Edition):
Abdullah, Ahmad Muhammad. “A New Solution for Improving Transmission Line Distance Protection Security During System-Wide Cascading Failures.” 2018. Web. 17 Apr 2021.
Vancouver:
Abdullah AM. A New Solution for Improving Transmission Line Distance Protection Security During System-Wide Cascading Failures. [Internet] [Doctoral dissertation]. Texas A&M University; 2018. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/173579.
Council of Science Editors:
Abdullah AM. A New Solution for Improving Transmission Line Distance Protection Security During System-Wide Cascading Failures. [Doctoral Dissertation]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/173579
Texas A&M University
20.
Singh, Harneet.
A Cost Effective, Integrated and Smart Radioactive Safeguard System.
Degree: MS, Electrical Engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8704
► Nuclear energy is a growing field worldwide due to its wide range of applications in various walks of life. It, however, deals with radioactive materials,…
(more)
▼ Nuclear energy is a growing field worldwide due to its wide range of applications
in various walks of life. It, however, deals with radioactive materials, specifically special
nuclear material, which, if misused, could result in catastrophic consequences. In order
to protect this precious resource and ensure its use for the good of mankind, safeguard
systems are more important than ever. Current Market solutions are wide ranged but
have a large number of disadvantages, some of which include high cost, constant
updates, and incomplete efforts. The rising need of a cost effective, efficient, and
integrated radioactive safeguard system serves as motivation for the solution outlined in
this thesis. The thesis outlines a solution structured around the three pillars of the
international safeguards program, namely, visual surveillance and motion detection,
containment analysis, and non-destructive analysis. The hardware around each of these
pillars work together with a clean and user-friendly application to provide a secure
safeguards system that is both flexible and extensible.
Advisors/Committee Members: Ji, Jim X. (advisor), Ehsani, Mehrdad (committee member), Righetti, Raffaella (committee member), Zubairy, M. S. (committee member).
Subjects/Keywords: Radioactive Safeguard System; Material Cost and Accounting; Cost Effective
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APA (6th Edition):
Singh, H. (2012). A Cost Effective, Integrated and Smart Radioactive Safeguard System. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8704
Chicago Manual of Style (16th Edition):
Singh, Harneet. “A Cost Effective, Integrated and Smart Radioactive Safeguard System.” 2012. Masters Thesis, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8704.
MLA Handbook (7th Edition):
Singh, Harneet. “A Cost Effective, Integrated and Smart Radioactive Safeguard System.” 2012. Web. 17 Apr 2021.
Vancouver:
Singh H. A Cost Effective, Integrated and Smart Radioactive Safeguard System. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8704.
Council of Science Editors:
Singh H. A Cost Effective, Integrated and Smart Radioactive Safeguard System. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8704
Texas A&M University
21.
Ituzaro, Fred Agyekum.
A Technique to Utilize Smart Meter Load Information for Adapting Overcurrent Protection for Radial Distribution Systems with Distributed Generations.
Degree: MS, Electrical Engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10791
► Smart radial distribution grids will include advanced metering infrastructure (AMI) and significant distributed generators (DGs) connected close to loads. DGs in these radial distribution systems…
(more)
▼ Smart radial distribution grids will include advanced metering infrastructure (AMI) and significant distributed generators (DGs) connected close to loads. DGs in these radial distribution systems (RDS) introduce bidirectional power flows (BPFs) and contribute to fault current. These BPFs may cause unwanted tripping of existing overcurrent (OC) protection devices and result in permanent outages for a large number of customers. This thesis presents a protection approach that modified an existing overcurrent protection scheme to reduce the number of customers affected by faults in RDS with DGs. Further, a technique is presented that utilizes customers loading information from smart meters in AMI to improve the sensitivity of substation OC relays by adaptively changing the pickup settings. The modified protection approach involves predefining zones in RDS with DGs and installing directional OC relays and circuit breakers at the zonal boundaries. Zonal boundary relays determine faulted zones by sharing information on the direction of detected faults current using binary state signals over a communication medium. The technique to adapt the substation relay pickup settings uses the demand measurements from smart meters for two 12-hour intervals from the previous day to determine the maximum diversified demand at the relay?s location. The pickup settings of the substation relay for the two 12-hour intervals during the following day for the zone supplied by the substation are adaptively set based on the current that corresponds to the maximum diversified demand from the previous day.
The techniques were validated through simulations in EMTP/PSCAD using an expanded IEEE 34 node radial test feeder that included DGs and a secondary distribution level. By decentralizing the control of the zonal boundary breakers, the single point of failure was eliminated in the modified protection approach. The cases studied showed that the modified protection approach allows for selective identification and isolation of the faulted zones. Also, the sensitivity of the substation OC relay was improved by at least 24% by using the pickup settings for the two 12-hour intervals from the smart meter demand measurements compared to the pickup settings computed using the conventional methodology based on the maximum loading of the zone.
Advisors/Committee Members: Butler-Purry, Karen L. (advisor), Ehsani, Mehrdad (committee member), Kundur, Deepa (committee member), Ntaimo, Lewis (committee member).
Subjects/Keywords: Smart distribution systems; Smart meters; Maximum diversified demand; Radial distribution systems; Distributed generation; Adaptive overcurrent protection; directional overcurrent relays; EMTP(TM)/PSCAD(R)
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APA (6th Edition):
Ituzaro, F. A. (2012). A Technique to Utilize Smart Meter Load Information for Adapting Overcurrent Protection for Radial Distribution Systems with Distributed Generations. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10791
Chicago Manual of Style (16th Edition):
Ituzaro, Fred Agyekum. “A Technique to Utilize Smart Meter Load Information for Adapting Overcurrent Protection for Radial Distribution Systems with Distributed Generations.” 2012. Masters Thesis, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10791.
MLA Handbook (7th Edition):
Ituzaro, Fred Agyekum. “A Technique to Utilize Smart Meter Load Information for Adapting Overcurrent Protection for Radial Distribution Systems with Distributed Generations.” 2012. Web. 17 Apr 2021.
Vancouver:
Ituzaro FA. A Technique to Utilize Smart Meter Load Information for Adapting Overcurrent Protection for Radial Distribution Systems with Distributed Generations. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10791.
Council of Science Editors:
Ituzaro FA. A Technique to Utilize Smart Meter Load Information for Adapting Overcurrent Protection for Radial Distribution Systems with Distributed Generations. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10791
Texas A&M University
22.
Torkan, Arash.
Design, Simulation and Implementation of a High Step-up Z-source DC-DC Converter with Flyback and Voltage Multiplier.
Degree: MS, Electrical Engineering, 2016, Texas A&M University
URL: http://hdl.handle.net/1969.1/158947
► Nowadays, because of pollution problems of the fossil fuels and their unpleasant effects on the earth planet and people life, renewable energy sources such az…
(more)
▼ Nowadays, because of pollution problems of the fossil fuels and their unpleasant effects on the earth planet and people life, renewable energy sources such az photovoltaic
(PV) cells and fuel cells are considered to produce electrical energy. These
sources directly convert solar energy and chemical energy to electrical energy, respectively.
Since the output voltage of PV cells is low, a high step-up dc-dc converter is
needed to increase this low voltage to meet inverter input required voltage.
In this thesis, a novel high step-up dc-dc converter (which is the derivation of
z-source converter) is introduced. This converter has a higher voltage gain in comparison
to the conventional converters. This advantage makes this converter a suitable
choice for high step-up applications, such as boosting the low output voltage of
solar panels. Also, by choosing appropriate turns ratio of the coupled inductors, the
proposed converter can be used for a wide range of voltage gain.
First, the z-source converter is analyzed and the conventional high step-up converters
are discussed. Then, the new high step up converter is proposed and analyzed.
The converter is simulated and the results are compared to the theoretical results.
The proposed converter is then experimentally tested. The experiment results verify
the theoretical and simulation results. Finally, the proposed converter is compared to
the conventional ones and it’s advantages such as having higher voltage gain are
confirmed.
Advisors/Committee Members: Ehsani, Mehrdad (advisor), Xie, Le (committee member), Karsilayan, Aydin I (committee member), Zoghi, Behbood B (committee member).
Subjects/Keywords: DC-DC Power Convertors; Z-source Converter; High Step-up Converters; High Voltage Gain Ratio; High step-up Applications; Photovoltaic Applications; Power Electronics
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APA (6th Edition):
Torkan, A. (2016). Design, Simulation and Implementation of a High Step-up Z-source DC-DC Converter with Flyback and Voltage Multiplier. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/158947
Chicago Manual of Style (16th Edition):
Torkan, Arash. “Design, Simulation and Implementation of a High Step-up Z-source DC-DC Converter with Flyback and Voltage Multiplier.” 2016. Masters Thesis, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/158947.
MLA Handbook (7th Edition):
Torkan, Arash. “Design, Simulation and Implementation of a High Step-up Z-source DC-DC Converter with Flyback and Voltage Multiplier.” 2016. Web. 17 Apr 2021.
Vancouver:
Torkan A. Design, Simulation and Implementation of a High Step-up Z-source DC-DC Converter with Flyback and Voltage Multiplier. [Internet] [Masters thesis]. Texas A&M University; 2016. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/158947.
Council of Science Editors:
Torkan A. Design, Simulation and Implementation of a High Step-up Z-source DC-DC Converter with Flyback and Voltage Multiplier. [Masters Thesis]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/158947
Texas A&M University
23.
Almehizia, Abdullah Abdulaziz M.
A Smart Grid Approach to Sustainable Power System Integration.
Degree: PhD, Electrical Engineering, 2018, Texas A&M University
URL: http://hdl.handle.net/1969.1/173662
► Many factors can be identified for faster incorporation of renewable energy resources to displace the traditional fossil fuel energy sources. These factors are divided into…
(more)
▼ Many factors can be identified for faster incorporation of renewable energy resources
to displace the traditional fossil fuel energy sources. These factors are divided into three
different aspects. First is the rapid decline of the cost of renewable energy sources and their
associated components. The second factor can be attributed to the increasing pressure to
transition from fossil-fuel energy sources which have detrimental environmental effects
towards more sustainable energy source. A third aspect can be introduced in countries
which are blessed with an enormous amount of fossil fuel resources, where the preservation
of these limited natural resources is of paramount importance to the country that holds
it. The dissertation includes the Kingdom of Saudi Arabia as the primary case study. However,
the algorithm developed is applicable for other geographical locations which share
similarities to the kingdom. The kingdom is considered to be one of the countries with an
abundance of fossil-fuel reserves. The unique features of Saudi Arabia are primarily the
availability of solar radiation and wind speed as well as high percentage of electrical loads
which can be controlled such as energy-intensive desalination plants. This feature, in particular,
provides a significant driver for renewables to penetrate the electricity generation
mixture. With loads that are deferrable, the issue of renewable sources variability can be
mitigated and reduced with an optimized operation strategy. Therefore, the research tends
to define and model electrical loads by how susceptible they are to the time of service.
The types of loads considered are summarized as non-deferrable such as typical electrical
loads in which the demand must be satisfied instantly, semi-deferrable loads which they
share the same features as the non-deferrable, however, a storage medium is available to
store energy products for later usage. This category of loads is represented by a water
desalination plant with a water tank storage. The final load model is the fully deferrable
load which is flexible in regarding time of service, and this type of load can be represented
by an industrial production factory, such as a steel or aluminum plants. The concept of
value storage is introduced, where energy can be stored in different forms which are quite
different from a typical storage component (i.e., batteries).
The justification to start increasing the penetration of renewable sources into the existing
grid in countries which have abundant fossil fuel might not be evident. However, the
dissertation provides both economical as well as environmental justifications and incentives
to approach more sustainable energy sources.
The economical and technical evaluation is referred to as the Generation Expansion
Planning (GEP). This type of problem is associated with high complexity and non-linearity.
Therefore, computational intelligence based optimization methods are used to resolve
these issues. Heuristic optimization methodologies are utilized to solve the developed
problem…
Advisors/Committee Members: Ehsani, Mehrdad (Mark) (advisor), Singh, Chanan (committee member), Kish, Lazlo B. (committee member), Kim, Won-Jong (committee member).
Subjects/Keywords: Renewable energy; load model; heuristic methods; cost savings
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APA (6th Edition):
Almehizia, A. A. M. (2018). A Smart Grid Approach to Sustainable Power System Integration. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/173662
Chicago Manual of Style (16th Edition):
Almehizia, Abdullah Abdulaziz M. “A Smart Grid Approach to Sustainable Power System Integration.” 2018. Doctoral Dissertation, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/173662.
MLA Handbook (7th Edition):
Almehizia, Abdullah Abdulaziz M. “A Smart Grid Approach to Sustainable Power System Integration.” 2018. Web. 17 Apr 2021.
Vancouver:
Almehizia AAM. A Smart Grid Approach to Sustainable Power System Integration. [Internet] [Doctoral dissertation]. Texas A&M University; 2018. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/173662.
Council of Science Editors:
Almehizia AAM. A Smart Grid Approach to Sustainable Power System Integration. [Doctoral Dissertation]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/173662
Texas A&M University
24.
Hussain, Hussain A.I.A.
Linear Permanent Magnet Machines for Oil Pumping Systems.
Degree: PhD, Electrical Engineering, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/161314
► Sucker rod pumping systems are the dominant technology used currently in oil pumping systems for stripper (marginal) wells. The system consists of a high-speed rotating…
(more)
▼ Sucker rod pumping systems are the dominant technology used currently in oil pumping systems for stripper (marginal) wells. The system consists of a high-speed rotating prime mover, a linear reciprocating pump, a gear reducer and a crank and beam mechanism to translate the high-speed rotating motion into a low-speed linear motion.
A sucker rod pumping system requires a relatively large surface area which limits its use in offshore applications. Moreover, the sucker rod pumping system cannot be used in deviated wells because of the long steel sucker rod.
In this research, the replacement of the sucker rod pumping system with a permanent magnet linear motor which drives the reciprocating pump directly is presented. In this system, the motor drive is placed on the surface and connected to the motor through a long cable. The motor is placed downhole to drive the reciprocating pump. The main challenges of this system result from the high temperature downhole and the long transmission cable and will be discussed in detail.
Another system which replaces the AC cable with a DC cable is proposed. In this system, the inverter is integrated with the motor downhole while the rectifier remains on the surface. A modified integrated motor drive with a speed control algorithm is proposed. Moreover, two sensorless algorithms are developed; one for the AC system and one for the DC system. The DC system algorithm estimates the motor position based on the motor model using the current and voltage measurements. The AC system sensorless algorithm utilizes both the motor and cable models to estimate the motor position and motor current.
Finally, a pump monitoring system is developed to detect the common pump faults. An observer is developed to estimate the load force from the motor current and speed. The load force could be used along the motor position to identify various fault signatures.
Advisors/Committee Members: Toliyat, Hamid A (advisor), Ehsani, Mehrdad (committee member), Bhattacharyya, Shankar P (committee member), Palazzolo, Alan (committee member).
Subjects/Keywords: Linear Motor; Motor Drive; Oil Pumping System
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APA (6th Edition):
Hussain, H. A. I. A. (2017). Linear Permanent Magnet Machines for Oil Pumping Systems. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/161314
Chicago Manual of Style (16th Edition):
Hussain, Hussain A I A. “Linear Permanent Magnet Machines for Oil Pumping Systems.” 2017. Doctoral Dissertation, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/161314.
MLA Handbook (7th Edition):
Hussain, Hussain A I A. “Linear Permanent Magnet Machines for Oil Pumping Systems.” 2017. Web. 17 Apr 2021.
Vancouver:
Hussain HAIA. Linear Permanent Magnet Machines for Oil Pumping Systems. [Internet] [Doctoral dissertation]. Texas A&M University; 2017. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/161314.
Council of Science Editors:
Hussain HAIA. Linear Permanent Magnet Machines for Oil Pumping Systems. [Doctoral Dissertation]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/161314
Texas A&M University
25.
Mashayekh, Salman.
An Integrated Security-constrained Model-based Dynamic Power Management Approach for Isolated Microgrid Power Systems.
Degree: PhD, Electrical Engineering, 2013, Texas A&M University
URL: http://hdl.handle.net/1969.1/151780
► Microgrid power systems draw lots of interests in marine, aerospace, and electric vehicle applications and are drawing increased attention for terrestrial applications. These power systems,…
(more)
▼ Microgrid power systems draw lots of interests in marine, aerospace, and electric vehicle applications and are drawing increased attention for terrestrial applications. These power systems, however, are prone to large frequency and voltage deviations, when disturbances happen. Therefore, an effective power management method is needed to operate microgrids optimally, while satisfying operating and security constraints.
In this dissertation, a new Integrated Security-Constrained Power Management (ISCPM) method is presented for isolated microgrid power systems during normal/alert operating states. The new ISCPM method was formulated as a multi-objective optimal control problem, in which set-points of several system control methods are minimally adjusted, subject to operating and security constraints, over a period in the future. To solve the ISCPM multi-objective optimal control problem, an evolutionary algorithm based on the Nondominated Sorting GA II (NSGA-II) was developed, in which the optimization solver is linked to a fast simulation core. A fuzzy membership based method was developed to identify the best compromise solution.
The new power management method was implemented on a notional computer model for an all-electric ship. The NSGA-II was developed in MATLAB, by adapting a general purpose GA toolbox, IlliGAL. To conduct transient simulations during the GA iterations, the simulation core of the TSAT Tool of Tools TM software package was used. The best compromise solution identification method was developed in MATLAB.
To illustrate how the new ISCPM method works in the notional all-electric ship model, several case studies were presented. Also, to evaluate the performance of the new ISCPM method, extensive studies were conducted. For these studies, a detailed electromagnetic transient model of the system in PSCAD was used. The performance analysis addressed quality of the new method from power system operation and multi-objective optimization perspectives. The results indicated that the new ISCPM method could effectively operate the system in an overall near-optimal condition, in which security and operating constraints are also satisfied.
The application of the new power management method is not limited to all-electric shipboard power systems and it has great potential to be extended to other types of isolated microgrid power systems.
Advisors/Committee Members: Butler-Purry, Karen L (advisor), Butenko, Sergiy (committee member), Ehsani, Mehrdad (committee member), Silva-Martinez, Jose (committee member).
Subjects/Keywords: Isolated power system; microgrid; all-electric ship; security-constrained power management; risk-based dynamic secure region; dynamic optimization; multi-objective optimal control; NSGA-II
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APA (6th Edition):
Mashayekh, S. (2013). An Integrated Security-constrained Model-based Dynamic Power Management Approach for Isolated Microgrid Power Systems. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/151780
Chicago Manual of Style (16th Edition):
Mashayekh, Salman. “An Integrated Security-constrained Model-based Dynamic Power Management Approach for Isolated Microgrid Power Systems.” 2013. Doctoral Dissertation, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/151780.
MLA Handbook (7th Edition):
Mashayekh, Salman. “An Integrated Security-constrained Model-based Dynamic Power Management Approach for Isolated Microgrid Power Systems.” 2013. Web. 17 Apr 2021.
Vancouver:
Mashayekh S. An Integrated Security-constrained Model-based Dynamic Power Management Approach for Isolated Microgrid Power Systems. [Internet] [Doctoral dissertation]. Texas A&M University; 2013. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/151780.
Council of Science Editors:
Mashayekh S. An Integrated Security-constrained Model-based Dynamic Power Management Approach for Isolated Microgrid Power Systems. [Doctoral Dissertation]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/151780
Texas A&M University
26.
Thatte, Anupam Ajit.
Risk Aware Robust Decision Making in Power Systems with Renewable Resources.
Degree: PhD, Electrical Engineering, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/153978
► The increasing penetration of renewable generation poses significant risks to the reliable operation of power systems, mainly due to the variable and uncertain nature of…
(more)
▼ The increasing penetration of renewable generation poses significant risks to the reliable operation of power systems, mainly due to the variable and uncertain nature of the output of wind and solar resources. This dissertation presents a robust optimization based decision making framework in future power systems with high penetration of variable renewable resources.
The first part of this dissertation involves the modeling and analysis of a robust optimization based bidding strategy for the combination of a wind farm and an energy storage device participating in a deregulated electricity market. The selection of the uncertainty set for the robust optimization problem, based on the decision maker’s risk preference, is also discussed. From the market participant’s point of view improved utilization of the renewable resource, through storage enabled energy arbitrage, can lead to better economic performance. The storage device can provide firming power to the output of the wind farm, enabling the renewable resource to participate in the electricity market. The robust optimization based approach is compared to a deterministic optimization based approach through a numerical example.
The second part of this dissertation investigates the metric and the dispatch method needed for a more robust real-time market operation. A novel metric for evaluating system-wide ramp flexibility is proposed. A robust framework to ensure the reliable dispatch of generators is presented and analyzed. The robust model is compared to both the conventional economic dispatch as well as a proposed industry approach to managing system flexibility called the look-ahead dispatch. Furthermore, the formulation for a robust multi-zonal dispatch model is presented. The proposed robust model and flexibility index is demonstrated through a numerical on a modified IEEE 24 Bus Reliability Test System.
Advisors/Committee Members: Xie, Le (advisor), Bhattacharyya, Shankar P (committee member), Ehsani, Mehrdad (committee member), Puller, Steven L (committee member).
Subjects/Keywords: bidding strategy; economic dispatch; electricity market; energy storage; ramp product; risk measure; renewable resources; robust optimization; uncertainty set; virtual power plant; wind power integration
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APA (6th Edition):
Thatte, A. A. (2014). Risk Aware Robust Decision Making in Power Systems with Renewable Resources. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/153978
Chicago Manual of Style (16th Edition):
Thatte, Anupam Ajit. “Risk Aware Robust Decision Making in Power Systems with Renewable Resources.” 2014. Doctoral Dissertation, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/153978.
MLA Handbook (7th Edition):
Thatte, Anupam Ajit. “Risk Aware Robust Decision Making in Power Systems with Renewable Resources.” 2014. Web. 17 Apr 2021.
Vancouver:
Thatte AA. Risk Aware Robust Decision Making in Power Systems with Renewable Resources. [Internet] [Doctoral dissertation]. Texas A&M University; 2014. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/153978.
Council of Science Editors:
Thatte AA. Risk Aware Robust Decision Making in Power Systems with Renewable Resources. [Doctoral Dissertation]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/153978
Texas A&M University
27.
Falahi, Milad.
Dynamic Reactive Power Control of Isolated Power Systems.
Degree: PhD, Electrical Engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/148126
► This dissertation presents dynamic reactive power control of isolated power systems. Isolated systems include MicroGrids in islanded mode, shipboard power systems operating offshore, or any…
(more)
▼ This dissertation presents dynamic reactive power control of isolated power systems. Isolated systems include MicroGrids in islanded mode, shipboard power systems operating offshore, or any other power system operating in islanded mode intentionally or due to a fault. Isolated power systems experience fast transients due to lack of an infinite bus capable of dictating the voltage and frequency reference. This dissertation only focuses on reactive control of islanded MicroGrids and AC/DC shipboard power systems. The problem is tackled using a Model Predictive Control (MPC) method, which uses a simplified model of the system to predict the voltage behavior of the system in future. The MPC method minimizes the voltage deviation of the predicted bus voltage; therefore, it is inherently robust and stable. In other words, this method can easily predict the behavior of the system and take necessary control actions to avoid instability. Further, this method is capable of reaching a smooth voltage profile and rejecting possible disturbances in the system.
The studied MicroGrids in this dissertation integrate intermittent distributed energy resources such as wind and solar generators. These non-dispatchable sources add to the uncertainty of the system and make voltage and reactive control more challenging. The model predictive controller uses the capability of these sources and coordinates them dynamically to achieve the voltage goals of the controller. The MPC controller is implemented online in a closed control loop, which means it is self-correcting with the feedback it receives from the system.
Advisors/Committee Members: Ehsani, Mehrdad (advisor), Butler-Purry, Karen L (advisor), Bhattacharyya, Shankar P (committee member), Hurtado, John E (committee member).
Subjects/Keywords: Solar energy; Wind energy; MicroGrids; Power system dynamics; loss minimization; Voltage and Var optimization; Voltage and Var control
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APA (6th Edition):
Falahi, M. (2012). Dynamic Reactive Power Control of Isolated Power Systems. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/148126
Chicago Manual of Style (16th Edition):
Falahi, Milad. “Dynamic Reactive Power Control of Isolated Power Systems.” 2012. Doctoral Dissertation, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/148126.
MLA Handbook (7th Edition):
Falahi, Milad. “Dynamic Reactive Power Control of Isolated Power Systems.” 2012. Web. 17 Apr 2021.
Vancouver:
Falahi M. Dynamic Reactive Power Control of Isolated Power Systems. [Internet] [Doctoral dissertation]. Texas A&M University; 2012. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/148126.
Council of Science Editors:
Falahi M. Dynamic Reactive Power Control of Isolated Power Systems. [Doctoral Dissertation]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/148126
Texas A&M University
28.
Nadubettu Yadukumar, Shishir 1986-.
Bipedal Robotic Walking on Flat-Ground, Up-Slope and Rough Terrain with Human-Inspired Hybrid Zero Dynamics.
Degree: MS, Electrical Engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/148284
► The thesis shows how to achieve bipedal robotic walking on flat-ground, up-slope and rough terrain by using Human-Inspired control. We begin by considering human walking…
(more)
▼ The thesis shows how to achieve bipedal robotic walking on flat-ground, up-slope and rough terrain by using Human-Inspired control. We begin by considering human walking data and find outputs (or virtual constraints) that, when calculated from the human data, are described by simple functions of time (termed canonical walking functions). Formally, we construct a torque controller, through model inversion, that drives the outputs of the robot to the outputs of the human as represented by the canonical walking function; while these functions fit the human data well, they do not apriori guarantee robotic walking (due to do the physical differences between humans and robots). An optimization problem is presented that determines the best fit of the canonical walking function to the human data, while guaranteeing walking for a specific bipedal robot; in addition, constraints can be added that guarantee physically realizable walking. We consider a physical bipedal robot, AMBER, and considering the special property of the motors used in the robot, i.e., low leakage inductance, we approximate the motor model and use the formal controllers that satisfy the constraints and translate into an efficient voltage-based controller that can be directly implemented on AMBER. The end result is walking on flat-ground and up-slope which is not just human-like, but also amazingly robust. Having obtained walking on specific well defined terrains separately, rough terrain walking is achieved by dynamically changing the extended canonical walking functions (ECWF) that the robot outputs should track at every step. The state of the robot, after every non-stance foot strike, is actively sensed and the new CWF is constructed to ensure Hybrid Zero Dynamics is respected in the next step. Finally, the technique developed is tried on different terrains in simulation and in AMBER showing how the walking gait morphs depending on the terrain.
Advisors/Committee Members: Ames, Aaron D (advisor), Bhattacharyya, Shankar P (committee member), Ehsani, Mehrdad (committee member), Zelenko, Igor (committee member).
Subjects/Keywords: Legged Walking; Bipedal Walking; Humanoid
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APA (6th Edition):
Nadubettu Yadukumar, S. 1. (2012). Bipedal Robotic Walking on Flat-Ground, Up-Slope and Rough Terrain with Human-Inspired Hybrid Zero Dynamics. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/148284
Chicago Manual of Style (16th Edition):
Nadubettu Yadukumar, Shishir 1986-. “Bipedal Robotic Walking on Flat-Ground, Up-Slope and Rough Terrain with Human-Inspired Hybrid Zero Dynamics.” 2012. Masters Thesis, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/148284.
MLA Handbook (7th Edition):
Nadubettu Yadukumar, Shishir 1986-. “Bipedal Robotic Walking on Flat-Ground, Up-Slope and Rough Terrain with Human-Inspired Hybrid Zero Dynamics.” 2012. Web. 17 Apr 2021.
Vancouver:
Nadubettu Yadukumar S1. Bipedal Robotic Walking on Flat-Ground, Up-Slope and Rough Terrain with Human-Inspired Hybrid Zero Dynamics. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/148284.
Council of Science Editors:
Nadubettu Yadukumar S1. Bipedal Robotic Walking on Flat-Ground, Up-Slope and Rough Terrain with Human-Inspired Hybrid Zero Dynamics. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/148284
Texas A&M University
29.
Chakali, Anil K.
Sensorless Speed Control of Permanent Magnet-Assisted Synchronous Reluctance Motor (PMa-SynRM).
Degree: MS, Electrical Engineering, 2011, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7405
► An interesting alternative for today's high efficiency variable speed drives is the Permanent Magnet-Assisted Synchronous Reluctance Motor drive, which belongs to the family of brushless…
(more)
▼ An interesting alternative for today's high efficiency variable speed drives is the Permanent Magnet-Assisted Synchronous Reluctance Motor drive, which belongs to the family of brushless synchronous AC motor drives. Generally, the reluctance torque of this motor is significant compared to the Permanent Magnet electrical torque. The advantage of increased reluctance torque is the decreased need of expensive permanent magnet (PM) material, which makes this solution thus cheaper than the respective permanent magnet motor. Also due to its synchronous operation, sensorless rotational control is possible along with higher power factor and better efficiency compared to the induction motor (IM).
Therefore, this thesis first deals with the implementation of a vector control strategy for speed control of the PMa-synRM motor that can be applied to a washing machine application. The machine is supplied by a current controlled voltage source PWM inverter to control the instantaneous stator currents which are decided by the reference speed.
Secondly, the thesis focuses on the sensorless speed operation of the PMa-SynRM to take advantage of the lower costs as well as increased system reliability which otherwise is not possible using the delicate speed or position sensors. The concept involves estimation of the rotor speed and/or position. There are several speed estimation techniques proposed by researchers and among them the observer based technique is proven and commonly used in the industry. The only requirements of the observer system are a very fast signal processor, specialized and optimized to perform complex mathematical calculations.
The feasibility and effectiveness of the control techniques are verified using the experimental results, implemented using the
Texas Instruments TMS320F2812 eZDSP controller board and the overall motor drive system in the laboratory.
Advisors/Committee Members: Toliyat, Hamid A. (advisor), Ehsani, Mehrdad (committee member), Bhattacharyya, Shankar (committee member), Kim, Won-Jong (committee member).
Subjects/Keywords: interesting alternative; high efficiency variable speed; significant; advantage; implementation; lower costs; increased system reliability; feasibility; effectiveness; verified
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APA (6th Edition):
Chakali, A. K. (2011). Sensorless Speed Control of Permanent Magnet-Assisted Synchronous Reluctance Motor (PMa-SynRM). (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7405
Chicago Manual of Style (16th Edition):
Chakali, Anil K. “Sensorless Speed Control of Permanent Magnet-Assisted Synchronous Reluctance Motor (PMa-SynRM).” 2011. Masters Thesis, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7405.
MLA Handbook (7th Edition):
Chakali, Anil K. “Sensorless Speed Control of Permanent Magnet-Assisted Synchronous Reluctance Motor (PMa-SynRM).” 2011. Web. 17 Apr 2021.
Vancouver:
Chakali AK. Sensorless Speed Control of Permanent Magnet-Assisted Synchronous Reluctance Motor (PMa-SynRM). [Internet] [Masters thesis]. Texas A&M University; 2011. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7405.
Council of Science Editors:
Chakali AK. Sensorless Speed Control of Permanent Magnet-Assisted Synchronous Reluctance Motor (PMa-SynRM). [Masters Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7405
Texas A&M University
30.
Alhuwaishel, Fahad.
The New Active Output Filter for Variable Speed Constant Frequency Aerospace Applications.
Degree: MS, Electrical Engineering, 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/155540
► A concept called “Active Output Filter” (AOF) for performing output filtering in switching converter is proposed. The methodology is based on voltage harmonic injection via…
(more)
▼ A concept called “Active Output Filter” (AOF) for performing output filtering in switching converter is proposed. The methodology is based on voltage harmonic injection via a combination of H Bridge and minimized LC filter to cancel out the odd harmonics from a 400Hz square wave 3 phase inverter to achieve a pure sinusoidal output with modulation index of 1.27. Investigation reveals that AOF allows a substantial size reduction and gives competitive efficiency, as compared to passive inductor capacitor filter. Moreover, the main square wave inverter has a capability to regulate the output voltage depending on the Load requirements providing a wide range of modulation index. The operation principle of the concept is demonstrated for Variable Speed Constant Frequency (VSCF) high power aircraft application. The exploration lays a foundation for further investigation into the use of AOF concept for other power electronic converter systems.
Advisors/Committee Members: Enjeti, Prasad (advisor), Ehsani, Mehrdad (Mark) (committee member), Bhattarcharya, Shanker P. (committee member), Daripa, Prabir (committee member).
Subjects/Keywords: Active Output Filter; AOF; Size reduction, Three phase; Single Phase; modulation index of 1.27; LOW THD, harmonic voltage injection, self balancing capacitors; voltage control; SHEPWM; SVPWM
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APA (6th Edition):
Alhuwaishel, F. (2015). The New Active Output Filter for Variable Speed Constant Frequency Aerospace Applications. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155540
Chicago Manual of Style (16th Edition):
Alhuwaishel, Fahad. “The New Active Output Filter for Variable Speed Constant Frequency Aerospace Applications.” 2015. Masters Thesis, Texas A&M University. Accessed April 17, 2021.
http://hdl.handle.net/1969.1/155540.
MLA Handbook (7th Edition):
Alhuwaishel, Fahad. “The New Active Output Filter for Variable Speed Constant Frequency Aerospace Applications.” 2015. Web. 17 Apr 2021.
Vancouver:
Alhuwaishel F. The New Active Output Filter for Variable Speed Constant Frequency Aerospace Applications. [Internet] [Masters thesis]. Texas A&M University; 2015. [cited 2021 Apr 17].
Available from: http://hdl.handle.net/1969.1/155540.
Council of Science Editors:
Alhuwaishel F. The New Active Output Filter for Variable Speed Constant Frequency Aerospace Applications. [Masters Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155540
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Open Access Theses and Dissertations