+publisher:"University of Texas – Austin" +contributor:("Kwasinski, Alexis")

1. Yu, Sheng-Yang. Realization, comparison, and topology investigation of multiple-input converters for distributed generation applications.

Degree: PhD, Electrical and Computer Engineering, 2012, University of Texas – Austin

URL: http://hdl.handle.net/2152/23409

► This dissertation systematically explores multiple-input converters (MICs) configuration and topologies, and then proposes improvements on certain beneficial MICs—time-sharing MICs and soft-switching MICs for distributed generation… (more)

▼ This dissertation systematically explores multiple-input converters (MICs) configuration and topologies, and then proposes improvements on certain beneficial MICs—time-sharing MICs and soft-switching MICs for distributed generation (DG) applications with high voltage transfer ratio. Compared with other MIC families which are derived from same input and output cells, time-sharing MICs have the fewest circuit components. However, time-sharing MICs lack for bi-directional power flow capability due to their special input switches requirement. In addition, their hard-switching characteristic leads to a low efficiency problem when isolation is necessary. The dissertation investigates into time-sharing MIC input switch selection, which leads to a new driving strategy and new input switch combinations. With the new input switch combinations, bi-directional and high efficiency time-sharing MICs are made possible. Besides isolated time-sharing MIC, Soft-switching MICs might also be a common choice for high voltage transfer ratio DG applications. However, the enormous amount of circuit components makes the soft-switching MICs become less attractive. An input cell reduction method is introduced in this dissertation to greatly reduce the component count of isolated MICs, including soft-switching MICs. In addition to the improvement on existing MIC families, a new push-pull connected MIC family is proposed in this dissertation as another choice of high voltage transfer ratio DG applications. Moreover, a comparison among MIC families is made to provide a sense of topologies selection in certain applications. Prototypes of time-sharing dual-input (DI) SEPICs, a push-pull connected DI-Boost converter, and a DI full-bridge (FB) converter are built to verify aspects discussed in this dissertation. Bi-directional power flow capability of time-sharing MIC is confirmed with a time-sharing DI-SEPIC and a soft-switching time-sharing MIC is realized by an isolated time-sharing DI-SEPIC with an active clamping leg. Maximum power point tracking control feasibility in these converters is evaluated with real photovoltaic modules that are connected to the push-pull connected DI-Boost converter that uses a perturb-and-observe method. Finally, an efficiency comparison is made between time-sharing MIC and push-pull connected MIC. Advisors/Committee Members: Kwasinski, Alexis (advisor).

Subjects/Keywords: Power electronics; Topologies; Multiple-input converter

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APA (6^th Edition):

Yu, S. (2012). Realization, comparison, and topology investigation of multiple-input converters for distributed generation applications. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/23409

Chicago Manual of Style (16^th Edition):

Yu, Sheng-Yang. “Realization, comparison, and topology investigation of multiple-input converters for distributed generation applications.” 2012. Doctoral Dissertation, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/23409.

MLA Handbook (7^th Edition):

Yu, Sheng-Yang. “Realization, comparison, and topology investigation of multiple-input converters for distributed generation applications.” 2012. Web. 25 Jan 2021.

Vancouver:

Yu S. Realization, comparison, and topology investigation of multiple-input converters for distributed generation applications. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2012. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/23409.

Council of Science Editors:

Yu S. Realization, comparison, and topology investigation of multiple-input converters for distributed generation applications. [Doctoral Dissertation]. University of Texas – Austin; 2012. Available from: http://hdl.handle.net/2152/23409

University of Texas – Austin

2. Desai, Harshad Suresh. Point-of-load converters for a residential dc distribution system.

Degree: MSin Engineering, Electrical and Computer Engineering, 2012, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2012-05-4971

► This thesis studies residential dc distribution system with primary focus on point-of-load (POL) converters. The growing number of inherently dc loads, increasing penetration of distributed… (more)

Subjects/Keywords: DC distribution; Point-of-load converters; Buck converter; State feedback control; Flyback converter

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APA (6^th Edition):

Desai, H. S. (2012). Point-of-load converters for a residential dc distribution system. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2012-05-4971

Chicago Manual of Style (16^th Edition):

Desai, Harshad Suresh. “Point-of-load converters for a residential dc distribution system.” 2012. Masters Thesis, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/ETD-UT-2012-05-4971.

MLA Handbook (7^th Edition):

Desai, Harshad Suresh. “Point-of-load converters for a residential dc distribution system.” 2012. Web. 25 Jan 2021.

Vancouver:

Desai HS. Point-of-load converters for a residential dc distribution system. [Internet] [Masters thesis]. University of Texas – Austin; 2012. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/ETD-UT-2012-05-4971.

Council of Science Editors:

Desai HS. Point-of-load converters for a residential dc distribution system. [Masters Thesis]. University of Texas – Austin; 2012. Available from: http://hdl.handle.net/2152/ETD-UT-2012-05-4971

University of Texas – Austin

3. Ganesan, Rahul. Battery Balancing at Xtreme Power.

Degree: MSin Engineering, Electrical and Computer Engineering, 2011, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2011-12-4571

► Battery pack imbalance is one of the most pressing issues for companies involved in Battery Energy Storage. The importance of Battery Balancing with respect to… (more)

Subjects/Keywords: Battery pack balancing

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APA (6^th Edition):

Ganesan, R. (2011). Battery Balancing at Xtreme Power. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2011-12-4571

Chicago Manual of Style (16^th Edition):

Ganesan, Rahul. “Battery Balancing at Xtreme Power.” 2011. Masters Thesis, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/ETD-UT-2011-12-4571.

MLA Handbook (7^th Edition):

Ganesan, Rahul. “Battery Balancing at Xtreme Power.” 2011. Web. 25 Jan 2021.

Vancouver:

Ganesan R. Battery Balancing at Xtreme Power. [Internet] [Masters thesis]. University of Texas – Austin; 2011. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/ETD-UT-2011-12-4571.

Council of Science Editors:

Ganesan R. Battery Balancing at Xtreme Power. [Masters Thesis]. University of Texas – Austin; 2011. Available from: http://hdl.handle.net/2152/ETD-UT-2011-12-4571

University of Texas – Austin

4. Toliyat, Amir. Modeling and simulation of distribution system components in anticipation of a smarter electric power grid.

Degree: MSin Engineering, Electrical and Computer Engineering, 2011, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2011-05-3265

► Successful development of the electric power grid of the future, hereinafter referred to as a smart grid, implicitly demands the capability to model the behavior,… (more)

Subjects/Keywords: Modeling; Smart grid; Simulink; Distribution system; Electrical engineering; Energy storage; Variable load; Plug-in electric vehicles

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APA (6^th Edition):

Toliyat, A. (2011). Modeling and simulation of distribution system components in anticipation of a smarter electric power grid. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2011-05-3265

Chicago Manual of Style (16^th Edition):

Toliyat, Amir. “Modeling and simulation of distribution system components in anticipation of a smarter electric power grid.” 2011. Masters Thesis, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/ETD-UT-2011-05-3265.

MLA Handbook (7^th Edition):

Toliyat, Amir. “Modeling and simulation of distribution system components in anticipation of a smarter electric power grid.” 2011. Web. 25 Jan 2021.

Vancouver:

Toliyat A. Modeling and simulation of distribution system components in anticipation of a smarter electric power grid. [Internet] [Masters thesis]. University of Texas – Austin; 2011. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/ETD-UT-2011-05-3265.

Council of Science Editors:

Toliyat A. Modeling and simulation of distribution system components in anticipation of a smarter electric power grid. [Masters Thesis]. University of Texas – Austin; 2011. Available from: http://hdl.handle.net/2152/ETD-UT-2011-05-3265

University of Texas – Austin

5. Dahlberg, Greg John. Fault clearance in distributed power architectures with limited energy flow through power electronic interfaces.

Degree: MSin Engineering, Electrical and Computer Engineering, 2012, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2012-05-5550

► The objective of this thesis is to determine a method for computing the amount of capacitance in a power electronic converter required to melt a… (more)

Subjects/Keywords: Fault clearance; DC micro-grids; Limited power flow; Output capacitor

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APA (6^th Edition):

Dahlberg, G. J. (2012). Fault clearance in distributed power architectures with limited energy flow through power electronic interfaces. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2012-05-5550

Chicago Manual of Style (16^th Edition):

Dahlberg, Greg John. “Fault clearance in distributed power architectures with limited energy flow through power electronic interfaces.” 2012. Masters Thesis, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/ETD-UT-2012-05-5550.

MLA Handbook (7^th Edition):

Dahlberg, Greg John. “Fault clearance in distributed power architectures with limited energy flow through power electronic interfaces.” 2012. Web. 25 Jan 2021.

Vancouver:

Dahlberg GJ. Fault clearance in distributed power architectures with limited energy flow through power electronic interfaces. [Internet] [Masters thesis]. University of Texas – Austin; 2012. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/ETD-UT-2012-05-5550.

Council of Science Editors:

Dahlberg GJ. Fault clearance in distributed power architectures with limited energy flow through power electronic interfaces. [Masters Thesis]. University of Texas – Austin; 2012. Available from: http://hdl.handle.net/2152/ETD-UT-2012-05-5550

6. Hill, Cody Aaron. Grid-scale battery energy storage systems.

Degree: MSin Engineering, Electrical and Computer Engineering, 2013, University of Texas – Austin

URL: http://hdl.handle.net/2152/22728

► This report presents an overview of the engineering considerations involved in the design of grid-scale battery energy storage systems. Grid-scale is defined here as systems… (more)

Subjects/Keywords: Battery energy storage systems; Energy storage; Renewable energy integration

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APA (6^th Edition):

Hill, C. A. (2013). Grid-scale battery energy storage systems. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/22728

Chicago Manual of Style (16^th Edition):

Hill, Cody Aaron. “Grid-scale battery energy storage systems.” 2013. Masters Thesis, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/22728.

MLA Handbook (7^th Edition):

Hill, Cody Aaron. “Grid-scale battery energy storage systems.” 2013. Web. 25 Jan 2021.

Vancouver:

Hill CA. Grid-scale battery energy storage systems. [Internet] [Masters thesis]. University of Texas – Austin; 2013. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/22728.

Council of Science Editors:

Hill CA. Grid-scale battery energy storage systems. [Masters Thesis]. University of Texas – Austin; 2013. Available from: http://hdl.handle.net/2152/22728

7. Krishnamurthy, Vaidyanathan. Microgrid availability during natural disasters.

Degree: PhD, Electrical & Computer Engineering, 2014, University of Texas – Austin

URL: http://hdl.handle.net/2152/26937

► A common issue with the power grid during natural disasters is low availability. Many critical applications that are required during and after natural disasters, for… (more)

Subjects/Keywords: Microgrid; Availability; Reliability; Lifelines; Interdependencies; Hurricanes; Earthquakes; Telecommunications; Base stations

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APA (6^th Edition):

Krishnamurthy, V. (2014). Microgrid availability during natural disasters. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/26937

Chicago Manual of Style (16^th Edition):

Krishnamurthy, Vaidyanathan. “Microgrid availability during natural disasters.” 2014. Doctoral Dissertation, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/26937.

MLA Handbook (7^th Edition):

Krishnamurthy, Vaidyanathan. “Microgrid availability during natural disasters.” 2014. Web. 25 Jan 2021.

Vancouver:

Krishnamurthy V. Microgrid availability during natural disasters. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2014. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/26937.

Council of Science Editors:

Krishnamurthy V. Microgrid availability during natural disasters. [Doctoral Dissertation]. University of Texas – Austin; 2014. Available from: http://hdl.handle.net/2152/26937

8. Ding, Guanyu, 1987-. Digital current mode control for multiple input converters.

Degree: MSin Engineering, Electrical and Computer Engineering, 2012, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2012-08-6274

► In this thesis, the possibility of applying digital current mode control on multiple-input (MI) converters is studied. As for MI topologies having a central energy… (more)

Subjects/Keywords: Power electronics; Multiple-input converter; Current-mode control; Digital; Constant on-time control

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APA (6^th Edition):

Ding, Guanyu, 1. (2012). Digital current mode control for multiple input converters. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2012-08-6274

Chicago Manual of Style (16^th Edition):

Ding, Guanyu, 1987-. “Digital current mode control for multiple input converters.” 2012. Masters Thesis, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/ETD-UT-2012-08-6274.

MLA Handbook (7^th Edition):

Ding, Guanyu, 1987-. “Digital current mode control for multiple input converters.” 2012. Web. 25 Jan 2021.

Vancouver:

Ding, Guanyu 1. Digital current mode control for multiple input converters. [Internet] [Masters thesis]. University of Texas – Austin; 2012. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/ETD-UT-2012-08-6274.

Council of Science Editors:

Ding, Guanyu 1. Digital current mode control for multiple input converters. [Masters Thesis]. University of Texas – Austin; 2012. Available from: http://hdl.handle.net/2152/ETD-UT-2012-08-6274

9. Devarajan, Bhargavi. Modeling of a DC fuse for protection of semiconductor devices using PSCAD/EMTDC.

Degree: MSin Engineering, Electrical and Computer Engineering, 2010, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2010-05-1377

► This thesis presents a new simulation model for DC fuses used to protect semiconductor devices using PSCAD /EMTDC. The basic construction and operation of fuses… (more)

Subjects/Keywords: DC Fuse; Modeling; PSCAD/EMTDC; Semiconductor devices

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APA (6^th Edition):

Devarajan, B. (2010). Modeling of a DC fuse for protection of semiconductor devices using PSCAD/EMTDC. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2010-05-1377

Chicago Manual of Style (16^th Edition):

Devarajan, Bhargavi. “Modeling of a DC fuse for protection of semiconductor devices using PSCAD/EMTDC.” 2010. Masters Thesis, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/ETD-UT-2010-05-1377.

MLA Handbook (7^th Edition):

Devarajan, Bhargavi. “Modeling of a DC fuse for protection of semiconductor devices using PSCAD/EMTDC.” 2010. Web. 25 Jan 2021.

Vancouver:

Devarajan B. Modeling of a DC fuse for protection of semiconductor devices using PSCAD/EMTDC. [Internet] [Masters thesis]. University of Texas – Austin; 2010. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/ETD-UT-2010-05-1377.

Council of Science Editors:

Devarajan B. Modeling of a DC fuse for protection of semiconductor devices using PSCAD/EMTDC. [Masters Thesis]. University of Texas – Austin; 2010. Available from: http://hdl.handle.net/2152/ETD-UT-2010-05-1377

University of Texas – Austin

10. Yoon, Ji Hoon. Demand side load control in residential buildings with HVAC controller for demand response.

Degree: PhD, Electrical and Computer Engineering, 2015, University of Texas – Austin

URL: http://hdl.handle.net/2152/46552

► Demand Response (DR) is a key factor to increase the efficiency of the power grid and has the potential to facilitate supply-demand balance. Demand side… (more)

▼ Demand Response (DR) is a key factor to increase the efficiency of the power grid and has the potential to facilitate supply-demand balance. Demand side load control can contribute to reduce electricity consumption through DR programs. Especially, Heating, Ventilating and Air Conditioning (HVAC) load is one of the major contributors to peak loads. In the United States, HVAC systems are the largest consumers of electrical energy and a major contributor to peak demand. In this research, the Dynamic Demand Response Controller (DDRC) is proposed to reduce peak load as well as saves electricity cost while maintaining reasonable thermal comfort by controlling HVAC system. To reduce both peak load and energy cost, DDRC controls the set-point temperature in a thermostat depending on real-time price of electricity. Residential buildings are modeled with various internal loads using building energy modeling tools. The weather data in different climate zones are used to demonstrate that DDRC decreases peak loads and brings economic benefit in various locations. In addition, two different types of electricity wholesale markets are used to generate DR signals. To assess the performance of DDRC, the control algorithms are improved to consider the characteristics of building envelopes and HVAC equipment. Also, DDRC is designed to be deployed in various areas with different electricity wholesale markets. The indoor thermal comfort on temperature and humidity are considered based on ASHRAE standard 55. Finally, DDRC is developed to a hardware using embedded system. The hardware of DDRC is based on Advanced RISC Microcontroller (ARM) processor and senses both indoor and outdoor environment with Internet connection capability for DR. In addition, user friendly Graphic User Interface (GUI) is generated to control DDRC. Advisors/Committee Members: Baldick, Ross (advisor), Novoselac, Atila (advisor), Arapostathis, Aristotle (committee member), Liedl, Petra G (committee member), Kwasinski, Alexis (committee member).

Subjects/Keywords: Smart grid; Demand response; Real-time price; HVAC; Thermostat

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APA (6^th Edition):

Yoon, J. H. (2015). Demand side load control in residential buildings with HVAC controller for demand response. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/46552

Chicago Manual of Style (16^th Edition):

Yoon, Ji Hoon. “Demand side load control in residential buildings with HVAC controller for demand response.” 2015. Doctoral Dissertation, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/46552.

MLA Handbook (7^th Edition):

Yoon, Ji Hoon. “Demand side load control in residential buildings with HVAC controller for demand response.” 2015. Web. 25 Jan 2021.

Vancouver:

Yoon JH. Demand side load control in residential buildings with HVAC controller for demand response. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2015. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/46552.

Council of Science Editors:

Yoon JH. Demand side load control in residential buildings with HVAC controller for demand response. [Doctoral Dissertation]. University of Texas – Austin; 2015. Available from: http://hdl.handle.net/2152/46552

University of Texas – Austin

11. -9323-7100. Security of electric power systems : cascading outage analysis, interdiction model and resilience to natural disasters.

Degree: PhD, Electrical and Computer Engineering, 2015, University of Texas – Austin

URL: http://hdl.handle.net/2152/32066

► Secure electric power system operation is key to social warfare. However, recent years have seen numerous natural disasters and terrorist attacks that threat the grid… (more)

Subjects/Keywords: Electric power systems; Interdiction; Cascading outages; Natural disasters

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APA (6^th Edition):

-9323-7100. (2015). Security of electric power systems : cascading outage analysis, interdiction model and resilience to natural disasters. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/32066

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Chicago Manual of Style (16^th Edition):

-9323-7100. “Security of electric power systems : cascading outage analysis, interdiction model and resilience to natural disasters.” 2015. Doctoral Dissertation, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/32066.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

MLA Handbook (7^th Edition):

-9323-7100. “Security of electric power systems : cascading outage analysis, interdiction model and resilience to natural disasters.” 2015. Web. 25 Jan 2021.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

-9323-7100. Security of electric power systems : cascading outage analysis, interdiction model and resilience to natural disasters. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2015. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/32066.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

-9323-7100. Security of electric power systems : cascading outage analysis, interdiction model and resilience to natural disasters. [Doctoral Dissertation]. University of Texas – Austin; 2015. Available from: http://hdl.handle.net/2152/32066

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

University of Texas – Austin

12. Dubey, Anamika. Distributed resource integration analysis and network design of electric power distribution systems.

Degree: PhD, Electrical and Computer Engineering, 2015, University of Texas – Austin

URL: http://hdl.handle.net/2152/63896

► The integration of high percentages of distributed energy resources and controllable loads into the distribution system coupled with the strict power quality and service reliability… (more)

▼ The integration of high percentages of distributed energy resources and controllable loads into the distribution system coupled with the strict power quality and service reliability requirements at the power distribution level are necessitating a significant change in the planning, operation and control of the traditional power distribution system. The future power distribution circuits should be able to accommodate the new technologies while simultaneously providing a desired level of power quality and service reliability to the customers. This thesis aims to address the current and future grid requirements of both existing as well as new distribution systems with regard to power quality and service reliability issues. Several methods are proposed to evaluate and mitigate power quality and service reliability concerns due to the integration of smart grid technologies into both existing and new distribution circuits. Notably, for the existing distribution circuits, integration studies are simulated to analyze and mitigate the impacts of electric vehicle loads and photovoltaic generation on the distribution voltages. Furthermore, the problem of siting, sizing and deployment of distributed energy storage systems in meeting distribution planning requirements with regard to integrating distributed generation and providing contingency requirements is also addressed. A new distribution system both grid-connected and operating in islanded mode, however, could be designed to the new requirements. The new distribution circuit could be designed to meet the power quality and service reliability standards directly, thus more efficiently mitigating the concerns. In the thesis, the new distribution circuit design is approached from the perspective of maximizing the service reliability. For the new distribution circuit, approaches to reliability based distribution circuit design are proposed. Advisors/Committee Members: Santoso, Surya (advisor), Arapostathis, Ari (committee member), Kwasinski, Alexis (committee member), Hallock, Gary (committee member), Ouroua, Abdelhamid (committee member).

Subjects/Keywords: Power distribution system; Distribution system planning; Distribution system design; Distributed resource integration

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APA (6^th Edition):

Dubey, A. (2015). Distributed resource integration analysis and network design of electric power distribution systems. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/63896

Chicago Manual of Style (16^th Edition):

Dubey, Anamika. “Distributed resource integration analysis and network design of electric power distribution systems.” 2015. Doctoral Dissertation, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/63896.

MLA Handbook (7^th Edition):

Dubey, Anamika. “Distributed resource integration analysis and network design of electric power distribution systems.” 2015. Web. 25 Jan 2021.

Vancouver:

Dubey A. Distributed resource integration analysis and network design of electric power distribution systems. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2015. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/63896.

Council of Science Editors:

Dubey A. Distributed resource integration analysis and network design of electric power distribution systems. [Doctoral Dissertation]. University of Texas – Austin; 2015. Available from: http://hdl.handle.net/2152/63896

University of Texas – Austin

13. Chirapongsananurak, Pisitpol. Distribution circuit multi-time-scale simulation tool for wind turbine and photovoltaic integration analysis.

Degree: PhD, Electrical and Computer Engineering, 2016, University of Texas – Austin

URL: http://hdl.handle.net/2152/68247

► Power system phenomena can be characterized into three types according to their time scales. Firstly, electromagnetic transient phenomena, such as the effects of capacitor switching… (more)

▼ Power system phenomena can be characterized into three types according to their time scales. Firstly, electromagnetic transient phenomena, such as the effects of capacitor switching and lightning strikes, have a time scale range of microseconds to milliseconds. Secondly, electromechanical transient phenomena, such as short-circuit faults on distribution circuits and inertial and frequency response of the power system, have a time scale in the order of hundreds of milliseconds to tens of seconds. Lastly, quasi-steady-state phenomena, such as voltage regulation, voltage unbalance, and wind speed and solar irradiance variation, have a time scale of several minutes and longer. Currently, because the time scales of these phenomena vary greatly from fractions of cycles to a few hours, only power system simulation tools for specific time scales are available. The objective of this research is to develop an integrated distribution circuit multi-time-scale simulation tool designed specifically for applications in wind turbine and photovoltaic (PV) integration analysis. This research contributes a multi-time-scale simulation tool for analysis and control of voltage regulation due to the variability of wind speed, solar irradiance, and load consumption, determining the maximum penetration of wind turbines and PVs, and sizing of energy storage for peak load shaving and power variability control. The proposed multi-time-scale simulation tool developed in MATLAB includes several distribution circuit components such as voltage sources, distribution lines, transformers, loads, capacitor banks, wind turbines, and PVs. Each equipment model in the proposed simulation tool consists of three models in different time scales, i.e., steady-state, electromechanical transient, and electromagnetic transient models. Therefore, the proposed tool is able to perform a long-term simulation involving power system phenomena spreading across time scales. Because distribution circuits are usually unbalanced, the proposed tool employs distribution circuit models with all three phases represented. The test circuit used to demonstrate the multi-time-scale simulation approach is the IEEE four-node test feeder with wind turbines and PVs connected at the feeder end. The results show that the proposed multi-time-scale simulation tool is able to simulate and analyze long-term power system phenomena spreading across time scales. Advisors/Committee Members: Santoso, Surya (advisor), Baldick, Ross (committee member), Hallock, Gary A (committee member), Kwasinski, Alexis (committee member), Longoria, Raul G (committee member).

Subjects/Keywords: Distributed power generation; Power system modeling; Power system simulation; Solar power generation; Wind power generation

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APA (6^th Edition):

Chirapongsananurak, P. (2016). Distribution circuit multi-time-scale simulation tool for wind turbine and photovoltaic integration analysis. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/68247

Chicago Manual of Style (16^th Edition):

Chirapongsananurak, Pisitpol. “Distribution circuit multi-time-scale simulation tool for wind turbine and photovoltaic integration analysis.” 2016. Doctoral Dissertation, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/68247.

MLA Handbook (7^th Edition):

Chirapongsananurak, Pisitpol. “Distribution circuit multi-time-scale simulation tool for wind turbine and photovoltaic integration analysis.” 2016. Web. 25 Jan 2021.

Vancouver:

Chirapongsananurak P. Distribution circuit multi-time-scale simulation tool for wind turbine and photovoltaic integration analysis. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2016. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/68247.

Council of Science Editors:

Chirapongsananurak P. Distribution circuit multi-time-scale simulation tool for wind turbine and photovoltaic integration analysis. [Doctoral Dissertation]. University of Texas – Austin; 2016. Available from: http://hdl.handle.net/2152/68247

University of Texas – Austin

14. Deka, Deepjyoti. Analysis of the power grid: structure and secure operations.

Degree: PhD, Electrical and Computer engineering, 2015, University of Texas – Austin

URL: http://hdl.handle.net/2152/32420

► Power Grids form one of the vital backbone-networks of our society providing electricity for daily socio-economic activities. Given its importance, there is a greater need… (more)

▼ Power Grids form one of the vital backbone-networks of our society providing electricity for daily socio-economic activities. Given its importance, there is a greater need to understand the structure and control of the power grid for fair power market computations and efficient delivery of electricity. This work studies two problems associated with different aspects of today's power grid network and combines techniques from network science, control theory and optimization to analyze them. The first problem relates to understanding the common structural features observed in several power grids across the world and developing a trackable modeling framework that incorporates these features. Such a framework can lead to insights on structural vulnerability of the grid and help design realistic test cases to study effects of structural and operational reinforcements as the grid evolves with time. We develop a generative model based on spatial point process theory that provably produces the distinct exponential degree distribution observed in several power grids. Further, critical graph parameters like diameter, eigen-spread, betweenness centralities and clustering coefficients are used to compare the performance of our framework in modeling the power grids in Western USA and under ERCOT in Texas. The second problem discussed here involves a detailed study of malicious data attacks on state estimation in the power grid. Such data attacks pose a serious threat to efforts related to implementing distributed control for efficient operations in the grid. We develop a graph-theoretic framework to analyze the design of optimal data attacks and study cost-optimal techniques to build resilience against them. The study involves attacks by a practical adversary capable of modifying meter readings as well as of jamming the flow of information from meters to the grid controller. We prove that the design of optimal `hidden' and `detectable' attacks can be formulated as constrained graph-cut problems that depend on the relative costs of adversarial techniques, and present algorithms for attack construction. Further, we design a new `topology' attack regime where an adversary changes beaker statuses of grid lines to affect state estimation in systems where all meter measurements are encrypted and hence secure from manipulation. We discuss bounds on the security requirements imposed by the developed attack models and design algorithms for determining the optimal protection strategy. This helps present an accurate characterization of grid vulnerability to general data attacks and eavesdroppers and motivates efforts to expand the presence of new secure meters to foil cyber attacks in the grid. Advisors/Committee Members: Vishwanath, Sriram (advisor), Baldick, Ross (committee member), Kwasinski, Alexis (committee member), Meyers, Lauren A. (committee member), Moorty, Sainath (committee member).

Subjects/Keywords: Power grid; Graph theory; Optimization; Control

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APA (6^th Edition):

Deka, D. (2015). Analysis of the power grid: structure and secure operations. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/32420

Chicago Manual of Style (16^th Edition):

Deka, Deepjyoti. “Analysis of the power grid: structure and secure operations.” 2015. Doctoral Dissertation, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/32420.

MLA Handbook (7^th Edition):

Deka, Deepjyoti. “Analysis of the power grid: structure and secure operations.” 2015. Web. 25 Jan 2021.

Vancouver:

Deka D. Analysis of the power grid: structure and secure operations. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2015. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/32420.

Council of Science Editors:

Deka D. Analysis of the power grid: structure and secure operations. [Doctoral Dissertation]. University of Texas – Austin; 2015. Available from: http://hdl.handle.net/2152/32420

University of Texas – Austin

15. Onwuchekwa, Chimaobi Nwachukwu. Analysis and control of power converters with instantaneous constant-power loads.

Degree: PhD, Electrical and Computer Engineering, 2011, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2011-08-4002

► This dissertation examines the effects of instantaneous constant-power loads (CPLs) on power converters. These CPLs are prevalent in distributed power architectures and are also present… (more)

▼ This dissertation examines the effects of instantaneous constant-power loads (CPLs) on power converters. These CPLs are prevalent in distributed power architectures and are also present in certain motor-drive applications. CPLs introduce a destabilizing nonlinear effect on power converters through an inverse voltage term that leads to significant oscillations in the main bus voltage or to its collapse. Boundary control is studied in order to stabilize dc-dc converters with instantaneous CPLs. The three basic topologies are studied: buck, boost, and buck-boost. Converter dynamics are analyzed in both switching states and the various operating regions of switch interaction with a first-order switching surface are identified. The analysis reveals important characteristics of CPLs. For non-minimum phase converters, in order to avoid issues related with the fact that the closed-loop state-dependent switching function is undefined on the switching surface, reflective mode solutions to both converter systems are defined in the sense of Filippov. Sufficient conditions for large-signal stability of the closed loop converter operating points are established. It is shown that first-order switching surfaces with negative slopes achieve large-signal stability, while positive slopes lead to instability. In particular, for the boost converter it is illustrated via simulations and experiments that positive slopes may lead to another closed-loop limit cycle. It is also shown that instability as well as system-stalling, which is termed the invariant-set problem, may still occur in reflective mode. However, a hysteresis band that contains the designed boundary may be used to prevent system-stalling, and also allow for a practical implementation of the controller by avoiding chattering. Regulation is also achieved. The dynamic behavior of single-phase full-wave uncontrolled rectifiers with instantaneous CPLs is also explored. Stable operation is shown to be dependent on initial condition and circuit parameters, which must fall within reasonable ranges that validate a CPL model. A necessary condition for stable operation of the rectifier system is thus derived. Furthermore, input and output characteristics of the rectifier with a CPL are investigated, and comparisons are made with the resistive case. A more complete model for the rectifier system that incorporates line-voltage distortion is also utilized to study the rectifier system. Simulations and experimental results are included for verification. Advisors/Committee Members: Kwasinski, Alexis (advisor), Grady, William M. (committee member), Driga, Mircea (committee member), Arapostathis, Aristotle (committee member), Akella, Maruthi (committee member).

Subjects/Keywords: Boundary control; Constant-power loads; Distributed power; Nonlinear system

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APA (6^th Edition):

Onwuchekwa, C. N. (2011). Analysis and control of power converters with instantaneous constant-power loads. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2011-08-4002

Chicago Manual of Style (16^th Edition):

Onwuchekwa, Chimaobi Nwachukwu. “Analysis and control of power converters with instantaneous constant-power loads.” 2011. Doctoral Dissertation, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/ETD-UT-2011-08-4002.

MLA Handbook (7^th Edition):

Onwuchekwa, Chimaobi Nwachukwu. “Analysis and control of power converters with instantaneous constant-power loads.” 2011. Web. 25 Jan 2021.

Vancouver:

Onwuchekwa CN. Analysis and control of power converters with instantaneous constant-power loads. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2011. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/ETD-UT-2011-08-4002.

Council of Science Editors:

Onwuchekwa CN. Analysis and control of power converters with instantaneous constant-power loads. [Doctoral Dissertation]. University of Texas – Austin; 2011. Available from: http://hdl.handle.net/2152/ETD-UT-2011-08-4002

University of Texas – Austin

16. -3517-1144. Energy storage sizing for low-inertia microgrids, and lessons learned from a potential microgrid.

Degree: PhD, Electrical and Computer engineering, 2016, University of Texas – Austin

URL: http://hdl.handle.net/2152/40268

► The coordinated control of multiple distributed generators in a microgrid and the preservation of adequate system inertia in real-time operations are some of the principal… (more)

▼ The coordinated control of multiple distributed generators in a microgrid and the preservation of adequate system inertia in real-time operations are some of the principal technical challenges for stable microgrid operation. One issue in particular pertains to grid-tied inverters, which, as mandated by present standards, are only permitted to operate at unity power factor, thereby requiring the microgrid’s synchronous generators to operate at a low power factor. This behavior accordingly introduces ramifications by limiting the generator’s active power output, which would compromise frequency and voltage stability margins. Consideration is also given to the effect of line impedances, since interconnecting microgrid lines can be described by a variety of X/R ratios that affect the control and flow of active and reactive power. Moreover, the absence of a stiff grid presents control challenges for grid-tied inverters due to the inverters’ tendency to regulate the voltage at the point of common coupling. These same inverters also jeopardize microgrid stability due to their low equivalent inertia as traditional forms of generation (i.e., spinning sources) become displaced by inertia-less inverters. Because of this low microgrid inertia, fluctuations in the output power of renewable energy sources or changes in local load levels may lead to power quality or frequency/voltage stability concerns. Therefore, energy storage sizing is investigated in this dissertation, as it is closely related to the stability analysis of microgrids. Furthermore, an existing residential community (in Austin, TX) described by a moderate penetration of photovoltaic sources and electric vehicle charging is considered, and the implications of said community being retrofitted to a microgrid are examined. Advisors/Committee Members: Baldick, Ross (advisor), Kwasinski, Alexis (advisor), Arapostathis, Aristotle (committee member), Hallock, Gary (committee member), Uriarte, Fabian (committee member).

Subjects/Keywords: Microgrid; Stability; Frequency; Voltage; Energy storage

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APA (6^th Edition):

-3517-1144. (2016). Energy storage sizing for low-inertia microgrids, and lessons learned from a potential microgrid. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/40268

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Chicago Manual of Style (16^th Edition):

-3517-1144. “Energy storage sizing for low-inertia microgrids, and lessons learned from a potential microgrid.” 2016. Doctoral Dissertation, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/40268.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

MLA Handbook (7^th Edition):

-3517-1144. “Energy storage sizing for low-inertia microgrids, and lessons learned from a potential microgrid.” 2016. Web. 25 Jan 2021.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

-3517-1144. Energy storage sizing for low-inertia microgrids, and lessons learned from a potential microgrid. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2016. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/40268.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

-3517-1144. Energy storage sizing for low-inertia microgrids, and lessons learned from a potential microgrid. [Doctoral Dissertation]. University of Texas – Austin; 2016. Available from: http://hdl.handle.net/2152/40268

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

University of Texas – Austin

17. Chun, Seunghyun. Analysis of classical root-finding methods applied to digital maximum power point tracking for photovoltaic energy generation.

Degree: PhD, Electrical and Computer Engineering, 2011, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2011-08-4326

► This dissertation examines the application of various classical root finding methods to digital maximum power point tracking (DMPPT). An overview of root finding methods such… (more)

Subjects/Keywords: MPPT; Solar power; Optimization; Digital MPPT; Partial shading; Photovoltaic; Root finding algorithm

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APA (6^th Edition):

Chun, S. (2011). Analysis of classical root-finding methods applied to digital maximum power point tracking for photovoltaic energy generation. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2011-08-4326

Chicago Manual of Style (16^th Edition):

Chun, Seunghyun. “Analysis of classical root-finding methods applied to digital maximum power point tracking for photovoltaic energy generation.” 2011. Doctoral Dissertation, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/ETD-UT-2011-08-4326.

MLA Handbook (7^th Edition):

Chun, Seunghyun. “Analysis of classical root-finding methods applied to digital maximum power point tracking for photovoltaic energy generation.” 2011. Web. 25 Jan 2021.

Vancouver:

Chun S. Analysis of classical root-finding methods applied to digital maximum power point tracking for photovoltaic energy generation. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2011. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/ETD-UT-2011-08-4326.

Council of Science Editors:

Chun S. Analysis of classical root-finding methods applied to digital maximum power point tracking for photovoltaic energy generation. [Doctoral Dissertation]. University of Texas – Austin; 2011. Available from: http://hdl.handle.net/2152/ETD-UT-2011-08-4326

University of Texas – Austin

18. Choung, Seung Hoon. Topology development and analysis for multiple input DC/DC converter.

Degree: PhD, Electrical and Computer Engineering, 2011, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2011-05-2795

► Nowadays, the number of applications which need more than one power source is increasing. Distributed generating systems or micro-grid systems normally use more than one… (more)

▼ Nowadays, the number of applications which need more than one power source is increasing. Distributed generating systems or micro-grid systems normally use more than one power source or more than one kind of energy source. Also, to increase the utilization of renewable energy sources, diversified energy source combination is recommended. For example, a wind-photovoltaic generating system, a combination of a wind generator and photovoltaic array, can give a greater degree of freedom when choosing the install location. The combination of more power sources and diversified power sources makes it possible to obtain higher availability in a power system. A parallel connection of converters has been used to integrate more than one energy source in a power system. However, a multiple-input converter (MIC) can generally have the following advantages compare to a combination of several individual converters; (1) cost reduction, (2) compactness, (3) more expandability and (4) greater manageability. First, this research suggests MIC topology comparison criteria that can be used as a decision guide for choosing a MIC topology depending on the application. Even though there are some MIC topology classification methods such as by the kind of combining methods, the classification methods are not enough to choose one particular topology. The comparison criteria presented in this dissertation are practical enough to decide which topology is suitable and should be chosen. Second, a new MI modified inverse Watkins-Johnson converter (MIMIWJC) without a coupled inductor is proposed. The circuit configuration of this converter and its operation principles are described, including the open-loop and closed-loop circuit. For control purposes, a small signal model of the proposed converter is developed using Middlebrook’s extra element theorem. In addition, two possible control methods are introduced in this dissertation. Finally, the theoretical analysis of the proposed converter is verified with simulations and experiments. Advisors/Committee Members: Kwasinski, Alexis (advisor), Grady, William M. (committee member), Araposththis, Aristotle (committee member), Driga, Mircea D. (committee member), Son, You S. (committee member).

Subjects/Keywords: Multiple-input DC-DC converter; Inversed Watkins-Johnson converter; Distributed generation; Micro-grid; Alternative energy source interface; Extra element theorem; Multiple-input converter

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APA (6^th Edition):

Choung, S. H. (2011). Topology development and analysis for multiple input DC/DC converter. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2011-05-2795

Chicago Manual of Style (16^th Edition):

Choung, Seung Hoon. “Topology development and analysis for multiple input DC/DC converter.” 2011. Doctoral Dissertation, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/ETD-UT-2011-05-2795.

MLA Handbook (7^th Edition):

Choung, Seung Hoon. “Topology development and analysis for multiple input DC/DC converter.” 2011. Web. 25 Jan 2021.

Vancouver:

Choung SH. Topology development and analysis for multiple input DC/DC converter. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2011. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/ETD-UT-2011-05-2795.

Council of Science Editors:

Choung SH. Topology development and analysis for multiple input DC/DC converter. [Doctoral Dissertation]. University of Texas – Austin; 2011. Available from: http://hdl.handle.net/2152/ETD-UT-2011-05-2795

University of Texas – Austin

19. -6151-0678. Plug-in electric vehicle deployment and integration with the electric grid.

Degree: PhD, Electrical and Computer Engineering, 2015, University of Texas – Austin

URL: http://hdl.handle.net/2152/32852

► Key battery, semiconductor, and software technologies have sufficiently progressed over the past few decades to enable viable plug-in electric vehicle (PEV) alternatives to conventional vehicles.… (more)

▼ Key battery, semiconductor, and software technologies have sufficiently progressed over the past few decades to enable viable plug-in electric vehicle (PEV) alternatives to conventional vehicles. Alternatives to petroleum-based fuels for transportation are sought to address concerns over energy security, foreign oil derived U.S. trade deficits, oil related geopolitical entanglements, and emissions. The various types of PEVs have substantially different characteristics. The types and key attributes of PEVs, charging standards, and charging locations are described. The likely scenario for PEV-Grid interactions over the next decade is synthesized from the analysis of the technologies available to and circumstances of vehicle manufacturers, utilities, and supplier firms. PEV adoption considerations are evolving. Many lessons have been learned from the first generation of PEVs that were introduced starting in late 2010. Technology, market, and policy drivers of emerging trends in the diffusion of PEVs are explored more in-depth. PEVs as electric loads are unique in that they are large, flexible, and intelligent. These attributes can not only provide utilities a new source of revenue, but also improve grid stability and economics. Actions, technologies, and policies that utilities can deploy to increase adoption are discussed. Actions are explored to make the overall PEV ownership experience superior to a conventional vehicle. This dissertation also describes research of the capability for PEVs in Vehicle to Home (V2H) scenarios, where the vehicle acts as a residential battery storage system and/or a backup generator in a residential microgrid configuration during a grid outage. Residential energy data collected from a smart grid testbed is used with a custom PEV model to assess the performance (in terms of duration and power output) of a BEV or PHEV used for backup power. Our earlier results quantify the extent to which photovoltaic (PV) generation and the characteristics of a PEV (battery size, gasoline availability) affect the backup duration during an electric grid outage. Strategies to further increase backup duration and non-continuous self-sustaining off-grid alternatives were found in our early V2H research. Varied amounts of load curtailment and PHEV engine-generator control improvements are modeled in subsequent research. Advisors/Committee Members: Baldick, Ross (advisor), Santoso, Surya (committee member), Dodabalapur, Ananth (committee member), Edgar, Thomas F (committee member), Webber, Michael (committee member), Kwasinski, Alexis (committee member).

Subjects/Keywords: Plug-in electric vehicle; PEV; EV; BEV; PHEV; V2H; G2V

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APA (6^th Edition):

-6151-0678. (2015). Plug-in electric vehicle deployment and integration with the electric grid. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/32852

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Chicago Manual of Style (16^th Edition):

-6151-0678. “Plug-in electric vehicle deployment and integration with the electric grid.” 2015. Doctoral Dissertation, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/32852.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

MLA Handbook (7^th Edition):

-6151-0678. “Plug-in electric vehicle deployment and integration with the electric grid.” 2015. Web. 25 Jan 2021.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

-6151-0678. Plug-in electric vehicle deployment and integration with the electric grid. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2015. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/32852.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

-6151-0678. Plug-in electric vehicle deployment and integration with the electric grid. [Doctoral Dissertation]. University of Texas – Austin; 2015. Available from: http://hdl.handle.net/2152/32852

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

University of Texas – Austin

20. Lee, Yen-Yu, 1984-. Improving electricity market efficiency : from market monitoring to reserve allocation.

Degree: PhD, Electrical and Computer Engineering, 2012, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2012-05-5426

► This dissertation proposes new methods to improve the efficiency of electricity markets with respect to market monitoring and reserve allocation. We first present new approaches… (more)

Subjects/Keywords: Electricity markets; Market power; Economic dispatch; Power system operations; Stochastic optimization; Operating reserves

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APA (6^th Edition):

Lee, Yen-Yu, 1. (2012). Improving electricity market efficiency : from market monitoring to reserve allocation. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2012-05-5426

Chicago Manual of Style (16^th Edition):

Lee, Yen-Yu, 1984-. “Improving electricity market efficiency : from market monitoring to reserve allocation.” 2012. Doctoral Dissertation, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/ETD-UT-2012-05-5426.

MLA Handbook (7^th Edition):

Lee, Yen-Yu, 1984-. “Improving electricity market efficiency : from market monitoring to reserve allocation.” 2012. Web. 25 Jan 2021.

Vancouver:

Lee, Yen-Yu 1. Improving electricity market efficiency : from market monitoring to reserve allocation. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2012. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/ETD-UT-2012-05-5426.

Council of Science Editors:

Lee, Yen-Yu 1. Improving electricity market efficiency : from market monitoring to reserve allocation. [Doctoral Dissertation]. University of Texas – Austin; 2012. Available from: http://hdl.handle.net/2152/ETD-UT-2012-05-5426

University of Texas – Austin

21. Lee, Hoon 1976-. Visual performance maps for expanded human choice based on duty/demand cycles in hybrid vehicle’s Multi-speed hub Drive Wheels.

Degree: PhD, Mechanical Engineering, 2012, University of Texas – Austin

URL: http://hdl.handle.net/2152/34080

► The Multi-speed hub Drive Wheel (MDW) for four-independent drive wheels of future electric vehicles has recently been designed by the Robotics Research Group at the… (more)

▼ The Multi-speed hub Drive Wheel (MDW) for four-independent drive wheels of future electric vehicles has recently been designed by the Robotics Research Group at the University of Texas at Austin. The MDW is equipped with four distinct speeds (two electrical and two mechanical) with the aim of improving efficiency and enhancing the drivability features of the vehicle, such as acceleration and braking on the driver’s command. The MDW will have different unsprung weights in the wheels depending on a range of suggested rated power levels such as 16, 20, 24, 32, up to a maximum of 40 hp, which would then become basic choices for the customer. The overall objective of the research is to analytically develop a framework for maximizing human vehicle choice by means of visualizing human performance needs/requirements so that customer demands can be met at the time of purchase for an open architecture hybrid electric vehicle which would then be assembled on demand. In addition, based on the customer’s individual duty/demand cycle, a vehicle can then be tailored to meet the particular customer priorities such as cost and efficiency, or on the other end of the spectrum, one who is an aggressive driver. This leads to expanded human choice for future electric vehicles. To meet human needs, the appropriate MDW will be software customized to suit the customer’s demand cycle. Satisfying human needs implies responding directly to human commands / objectives over the life history of the vehicle. The decision framework developed in this study is based on detailed human needs structured by performance maps to visually guide the customer in terms of purchase / operation / maintenance / refreshment decisions. This framework augments the MDW design procedure to maximize operational efficiency and drivability for unique customer requirements. The customer-oriented duty cycle analysis based on an individual’s measured demand cycle is proposed to structure the MDW specification in terms of ten purchase criteria. Also, a comparison of two speed regimes in the MDW and Protean’s single speed in-wheel model is made and discussed in terms of efficiency. The analytical result shows that a remarkable efficiency improvement in terms of loss reduction of 1.9x for urban and 1.8x for highway duty cycles is feasible. In addition, another loss reduction of 1.2x is expected by using the reconfigurable power/electronic controllers. The present study looked at the effect of the unsprung mass on acceleration, braking, and cornering maneuvers under various road conditions (i.e., dry asphalt, wet asphalt, snowy or icy road) which was evaluated and compared based on the implementation of a nonlinear 14 DOF full-vehicle model based on ride (7 DOF), handling (3 DOF), tire (4 DOF), slip ratio, slip angle, and the tire magic formula. Based on the 14 DOF full-vehicle model, visual performance maps are generated in terms of ten operational criteria to assist the customer to visualize the vehicle’s expected performance. Advisors/Committee Members: Tesar, Delbert (advisor), Fahrenthold, Eric P (committee member), Djurdjanovic, Dragan (committee member), Chen, Dongmei (committee member), Kwasinski, Alexis (committee member), Ashok, Pradeepkumar (committee member).

Subjects/Keywords: Drive Wheel; Human choice; Individual duty/demand cycle; Efficiency; Purchase/operation/maintenance/refreshment standpoints

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APA (6^th Edition):

Lee, H. 1. (2012). Visual performance maps for expanded human choice based on duty/demand cycles in hybrid vehicle’s Multi-speed hub Drive Wheels. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/34080

Chicago Manual of Style (16^th Edition):

Lee, Hoon 1976-. “Visual performance maps for expanded human choice based on duty/demand cycles in hybrid vehicle’s Multi-speed hub Drive Wheels.” 2012. Doctoral Dissertation, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/34080.

MLA Handbook (7^th Edition):

Lee, Hoon 1976-. “Visual performance maps for expanded human choice based on duty/demand cycles in hybrid vehicle’s Multi-speed hub Drive Wheels.” 2012. Web. 25 Jan 2021.

Vancouver:

Lee H1. Visual performance maps for expanded human choice based on duty/demand cycles in hybrid vehicle’s Multi-speed hub Drive Wheels. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2012. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/34080.

Council of Science Editors:

Lee H1. Visual performance maps for expanded human choice based on duty/demand cycles in hybrid vehicle’s Multi-speed hub Drive Wheels. [Doctoral Dissertation]. University of Texas – Austin; 2012. Available from: http://hdl.handle.net/2152/34080

22. Jin, Joo Hyun. Impacts of environmental regulation and wind penetration level on the ERCOT market.

Degree: MSin Engineering, Electrical and Computer Engineering, 2012, University of Texas – Austin

URL: http://hdl.handle.net/2152/19715

► As more renewable resources are added into the grid and environmental regulations are imposed to reduce emissions, there will be dramatic changes in the generation… (more)

Subjects/Keywords: Wind penetration; ERCOT; Environmental regulation; Capacity expansion; Emission; AURORAxmp

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APA (6^th Edition):

Jin, J. H. (2012). Impacts of environmental regulation and wind penetration level on the ERCOT market. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/19715

Chicago Manual of Style (16^th Edition):

Jin, Joo Hyun. “Impacts of environmental regulation and wind penetration level on the ERCOT market.” 2012. Masters Thesis, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/19715.

MLA Handbook (7^th Edition):

Jin, Joo Hyun. “Impacts of environmental regulation and wind penetration level on the ERCOT market.” 2012. Web. 25 Jan 2021.

Vancouver:

Jin JH. Impacts of environmental regulation and wind penetration level on the ERCOT market. [Internet] [Masters thesis]. University of Texas – Austin; 2012. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/19715.

Council of Science Editors:

Jin JH. Impacts of environmental regulation and wind penetration level on the ERCOT market. [Masters Thesis]. University of Texas – Austin; 2012. Available from: http://hdl.handle.net/2152/19715

23. Cunningham, John David. Switched reluctance motor drive circuit evaluation criteria for vehicle efficiency responsiveness.

Degree: MSin Engineering, Electrical and Computer Engineering, 2011, University of Texas – Austin

URL: http://hdl.handle.net/2152/20640

► This thesis intends to examine the principles of operation for switched reluctance machines (SRM) and examine the power electronic drive circuits that control them, in… (more)

Subjects/Keywords: Switched Reluctance Motor; Drive Efficiency; Drivability; Power Electronic Converter

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APA (6^th Edition):

Cunningham, J. D. (2011). Switched reluctance motor drive circuit evaluation criteria for vehicle efficiency responsiveness. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/20640

Chicago Manual of Style (16^th Edition):

Cunningham, John David. “Switched reluctance motor drive circuit evaluation criteria for vehicle efficiency responsiveness.” 2011. Masters Thesis, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/20640.

MLA Handbook (7^th Edition):

Cunningham, John David. “Switched reluctance motor drive circuit evaluation criteria for vehicle efficiency responsiveness.” 2011. Web. 25 Jan 2021.

Vancouver:

Cunningham JD. Switched reluctance motor drive circuit evaluation criteria for vehicle efficiency responsiveness. [Internet] [Masters thesis]. University of Texas – Austin; 2011. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/20640.

Council of Science Editors:

Cunningham JD. Switched reluctance motor drive circuit evaluation criteria for vehicle efficiency responsiveness. [Masters Thesis]. University of Texas – Austin; 2011. Available from: http://hdl.handle.net/2152/20640

24. Murali, Pandarinath. Dynamic modeling of six-pulse rectifier for short-circuit current characterization.

Degree: MSin Engineering, Electrical and Computer Engineering, 2011, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2011-12-4401

► Existing models describing the dynamic behavior of a six-pulse rectifier during a short-circuit fault condition are derived from switch models using time-domain average value parametric… (more)

Subjects/Keywords: Six-pulse rectifier; Short-circuit characteristics; Controlled rectifier; Average value modeling; Dc breaker

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APA (6^th Edition):

Murali, P. (2011). Dynamic modeling of six-pulse rectifier for short-circuit current characterization. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2011-12-4401

Chicago Manual of Style (16^th Edition):

Murali, Pandarinath. “Dynamic modeling of six-pulse rectifier for short-circuit current characterization.” 2011. Masters Thesis, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/ETD-UT-2011-12-4401.

MLA Handbook (7^th Edition):

Murali, Pandarinath. “Dynamic modeling of six-pulse rectifier for short-circuit current characterization.” 2011. Web. 25 Jan 2021.

Vancouver:

Murali P. Dynamic modeling of six-pulse rectifier for short-circuit current characterization. [Internet] [Masters thesis]. University of Texas – Austin; 2011. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/ETD-UT-2011-12-4401.

Council of Science Editors:

Murali P. Dynamic modeling of six-pulse rectifier for short-circuit current characterization. [Masters Thesis]. University of Texas – Austin; 2011. Available from: http://hdl.handle.net/2152/ETD-UT-2011-12-4401

25. Ramasubramanian, Karthik. Single phase grid tie inverter for solar PV panels with active power decoupling circuit.

Degree: MSin Engineering, Electrical and Computer Engineering, 2012, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2012-05-5628

► Distributed energy resources like solar power (PV Panels) are usually connected to the AC grid through a single phase voltage source inverter (VSI). The major… (more)

Subjects/Keywords: Photovoltaic (PV) panels; Voltage Source Inverter (VSI); Active power decoupling circuit

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APA (6^th Edition):

Ramasubramanian, K. (2012). Single phase grid tie inverter for solar PV panels with active power decoupling circuit. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2012-05-5628

Chicago Manual of Style (16^th Edition):

Ramasubramanian, Karthik. “Single phase grid tie inverter for solar PV panels with active power decoupling circuit.” 2012. Masters Thesis, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/ETD-UT-2012-05-5628.

MLA Handbook (7^th Edition):

Ramasubramanian, Karthik. “Single phase grid tie inverter for solar PV panels with active power decoupling circuit.” 2012. Web. 25 Jan 2021.

Vancouver:

Ramasubramanian K. Single phase grid tie inverter for solar PV panels with active power decoupling circuit. [Internet] [Masters thesis]. University of Texas – Austin; 2012. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/ETD-UT-2012-05-5628.

Council of Science Editors:

Ramasubramanian K. Single phase grid tie inverter for solar PV panels with active power decoupling circuit. [Masters Thesis]. University of Texas – Austin; 2012. Available from: http://hdl.handle.net/2152/ETD-UT-2012-05-5628

University of Texas – Austin

26. Estes, Hunter Blake. Horizontal series fault comparison in AC.

Degree: MSin Engineering, Electrical and Computer Engineering, 2011, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2011-12-4776

► This research focuses on empirical observations of horizontal series arc faults. These faults differ from ground faults, for series faults encompass the electromagnetic transient effects… (more)

Subjects/Keywords: Direct current; Open series fault; Arc transient; Spike; Current interruption; Micro-grid

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APA (6^th Edition):

Estes, H. B. (2011). Horizontal series fault comparison in AC. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2011-12-4776

Chicago Manual of Style (16^th Edition):

Estes, Hunter Blake. “Horizontal series fault comparison in AC.” 2011. Masters Thesis, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/ETD-UT-2011-12-4776.

MLA Handbook (7^th Edition):

Estes, Hunter Blake. “Horizontal series fault comparison in AC.” 2011. Web. 25 Jan 2021.

Vancouver:

Estes HB. Horizontal series fault comparison in AC. [Internet] [Masters thesis]. University of Texas – Austin; 2011. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/ETD-UT-2011-12-4776.

Council of Science Editors:

Estes HB. Horizontal series fault comparison in AC. [Masters Thesis]. University of Texas – Austin; 2011. Available from: http://hdl.handle.net/2152/ETD-UT-2011-12-4776

27. Zhao, Ruichen. Analysis, modeling, and control of highly-efficient hybrid dc-dc conversion systems.

Degree: PhD, Electrical and Computer Engineering, 2012, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2012-12-6609

► This dissertation studies hybrid dc-dc power conversion systems based on multiple-input converters (MICs), or more generally, multiport converters. MICs allow for the integration of multiple… (more)

▼ This dissertation studies hybrid dc-dc power conversion systems based on multiple-input converters (MICs), or more generally, multiport converters. MICs allow for the integration of multiple distributed generation sources and loads. Thanks to the modular design, an MIC yields a scalable system with independent control in all sources. Additional characteristics of MICs include the improved reliability and reduced cost. This dissertation mainly studies three issues of MICs: efficiency improvement, modeling, and control. First, this work develops a cost-effective design of a highly-efficient non-isolated MIC without additional components. Time-multiplexing (TM) MICs, which are driven by a time-multiplexing switching control scheme, contain forward-conducting-bidirectional-blocking (FCBB) switches. TM-MICs are considered to be subject to low efficiency because of high power loss introduced by FCBB switches. In order to reduce the power loss in FCBB switches, this work adopts a modified realization of the FCBB switch and proposes a novel switching control strategy. The design and experimental verifications are motivated through a multiple-input (MI) SEPIC converter. Through the design modifications, the switching transients are improved (comparing to the switching transients in a conventional MI-SEPIC) and the power loss is significantly reduced. Moreover, this design maintains a low parts-count because of the absence of additional components. Experimental results show that for output power ranging from 1 W to 220 W, the modified MIC presents high efficiency (96 % optimally). The design can be readily extended to a general n-input SEPIC. The same modifications can be applied to an MI-Ćuk converter. Second, this dissertation examines the modeling of TM-MICs. In the dynamic equations of a TM-MIC, a state variable from one input leg is possible to be affected by state variables and switching functions associated with other input legs. In this way, inputs are coupled both topologically and in terms of control actions through switching functions. Coupling among the state variable and the time-multiplexing switching functions complicate TM-MICs’ behavior. Consequently, substantial modeling errors may occur when a classical averaging approach is used to model an MIC even with moderately high switching frequencies or small ripples. The errors may increase with incremental number of input legs. In addition to demonstrating the special features on MIC modeling, this dissertation uses the generalized averaging approach to generate a more accurate model, which is also used to derive a small-signal model. The proposed model is an important tool that yields better results when analyzing power budgeting, performing large-signal simulations, and designing controllers for TM-MICs via a more precise representation than classical averaging methods. Analyses are supported by simulations and experimental results. Third, this dissertation studies application of a decentralized controller on an MI-SEPIC. For an MIC, a… Advisors/Committee Members: Kwasinski, Alexis (advisor), Aristotle, Arapostathis (committee member), Grady, William (committee member), Akella, Maruthi (committee member), Driga, Mircea (committee member).

Subjects/Keywords: Micro-grid; Power electronics; Multi-port converter; Modeling; Robust control; Efficiency improvement

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APA (6^th Edition):

Zhao, R. (2012). Analysis, modeling, and control of highly-efficient hybrid dc-dc conversion systems. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2012-12-6609

Chicago Manual of Style (16^th Edition):

Zhao, Ruichen. “Analysis, modeling, and control of highly-efficient hybrid dc-dc conversion systems.” 2012. Doctoral Dissertation, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/ETD-UT-2012-12-6609.

MLA Handbook (7^th Edition):

Zhao, Ruichen. “Analysis, modeling, and control of highly-efficient hybrid dc-dc conversion systems.” 2012. Web. 25 Jan 2021.

Vancouver:

Zhao R. Analysis, modeling, and control of highly-efficient hybrid dc-dc conversion systems. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2012. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/ETD-UT-2012-12-6609.

Council of Science Editors:

Zhao R. Analysis, modeling, and control of highly-efficient hybrid dc-dc conversion systems. [Doctoral Dissertation]. University of Texas – Austin; 2012. Available from: http://hdl.handle.net/2152/ETD-UT-2012-12-6609

28. Srinivasan, Mahesh. Hierarchical control of dc microgrids with constant power loads.

Degree: PhD, Electrical and Computer Engineering, 2017, University of Texas – Austin

URL: http://hdl.handle.net/2152/62067

► This dissertation proposes general methodologies for designing hierarchical control schemes for dc microgrids loaded by constant power loads (CPLs). CPLs form a major proportion of… (more)

▼ This dissertation proposes general methodologies for designing hierarchical control schemes for dc microgrids loaded by constant power loads (CPLs). CPLs form a major proportion of the system loads in many microgrids. Without proper control, CPLs present destabilizing effect at the dc microgrid. In addition to stable operation of microgrid, proper current sharing among paralleled sources is essential. The proposed hierarchical control strategy consists of two control levels. The lower level consists of droop-based primary controllers which enables current-sharing among paralleled sources and also damps limit cycle oscillations due to CPLs. The higher level consists of secondary controller which compensates for voltage deviations due to primary controller. This higher level is implemented either as autonomous controllers or as a centralized controller. In the case of autonomous secondary controllers, they operate alongside of primary controllers in each of the paralleled converters. In the case of centralized secondary controller, a remote secondary controller uses a high speed communication link to communicate to local controllers. Interfacing sources with different characteristics and voltage ranges necessitates the use of complex converter topologies. As an initial step towards implementing hierarchical control scheme for such microgrids with CPLs, a linear controller is proposed for dc microgrids with standalone SEPIC, Cuk and Zeta converters. During the first stage of the two stage controller, limit cycle oscillations are damped by inserting a virtual resistance in series with the converter input inductor. During the second stage, an integral controller is added to the first stage to compensate for voltage deviations. For microgrids containing different converter topologies, stability of equilibrium points is examined and stability conditions are derived and explained. Experiments performed on a prototype microgrid are used to verify the proposed control laws. Expanding study on stability of microgrids, the maximum real power load in a dc microgrid bus is traced geometrically. The generalized circle diagram approach used in a conventional power system is modified for this purpose. The different types of buses present in a dc microgrid are described and the locus of operating points is obtained. The proposed method is verified by simulations on an example dc microgrid. Advisors/Committee Members: Baldick, Ross (advisor), Kwasinski, Alexis (committee member), Arapostathis, Aristotle (committee member), Hallock, Gary (committee member), Hebner, Robert (committee member).

Subjects/Keywords: Microgrids; Constant power loads; Power electronic converters; Stability

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APA (6^th Edition):

Srinivasan, M. (2017). Hierarchical control of dc microgrids with constant power loads. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/62067

Chicago Manual of Style (16^th Edition):

Srinivasan, Mahesh. “Hierarchical control of dc microgrids with constant power loads.” 2017. Doctoral Dissertation, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/62067.

MLA Handbook (7^th Edition):

Srinivasan, Mahesh. “Hierarchical control of dc microgrids with constant power loads.” 2017. Web. 25 Jan 2021.

Vancouver:

Srinivasan M. Hierarchical control of dc microgrids with constant power loads. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2017. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/62067.

Council of Science Editors:

Srinivasan M. Hierarchical control of dc microgrids with constant power loads. [Doctoral Dissertation]. University of Texas – Austin; 2017. Available from: http://hdl.handle.net/2152/62067

29. Kim, Myungchin. Design and operation of modular microgrids.

Degree: PhD, Electrical and Computer engineering, 2015, University of Texas – Austin

URL: http://hdl.handle.net/2152/31416

► Microgrids are being considered as a solution for implementing more reliable and flexible power systems compared to the conventional power grid. Various factors, such as… (more)

▼ Microgrids are being considered as a solution for implementing more reliable and flexible power systems compared to the conventional power grid. Various factors, such as low system inertia, might make the task of microgrid design and operation to be nontrivial. In order to address the needs for operational flexibility in a simpler manner, this dissertation discusses modular approaches for design and operation of microgrids. This research investigates Active Power Distribution Nodes (APDNs), which is a storage integrated power electronic interface, as an interface block for designing modular microgrids. To perform both voltage/current regulation and energy management of APDNs, two hierarchical control frameworks for APDNs are proposed. The first framework focuses on maintaining the charge level of the embedded energy storage at the highest available level to increase system availability, and the second framework focuses on autonomous power sharing, and storage management. The detailed design process, control performance and stability characteristics are also studied. The performance is also verified by both simulation and experiments. The control approaches enable application of APDNs as a power router realizing distributed energy management. The decentralized configuration also increases modularity and availability of power networks by preventing single point-of-failures. The advantages of using APDNs as a connection interface inside a power network are discussed from an availability perspective by performing a comparison using Markov-based availability models. Furthermore, the operation of APDNs as power buffers is explored and the application of APDNs enabling modular implementation of microgrids is also studied. APDNs enable the system expansion process—i.e. connecting new loads to the original system—to be performed without modifying the configuration of the original system. The analysis results show that a fault-tolerant microgrid with an open architecture can be realized in a modular manner with APDNs. APDNs also enable simplified selectivity planning for system protection. The effect of modular operation on microgrids is also studied by using an inertia index. The index not only provides insights on how system performance is affected by modular operation of modular microgrids, but is also used to develop a simpler operation strategy to mitigate the effect of plug and play operations. Advisors/Committee Members: Baldick, Ross (advisor), Kwasinski, Alexis (advisor), Arapostathis, Aristotle (committee member), Hallock, Gary (committee member), Hebner, Robert (committee member).

Subjects/Keywords: Power control; Energy management; Hiearchical control; Microgrids

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APA (6^th Edition):

Kim, M. (2015). Design and operation of modular microgrids. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/31416

Chicago Manual of Style (16^th Edition):

Kim, Myungchin. “Design and operation of modular microgrids.” 2015. Doctoral Dissertation, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/31416.

MLA Handbook (7^th Edition):

Kim, Myungchin. “Design and operation of modular microgrids.” 2015. Web. 25 Jan 2021.

Vancouver:

Kim M. Design and operation of modular microgrids. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2015. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/31416.

Council of Science Editors:

Kim M. Design and operation of modular microgrids. [Doctoral Dissertation]. University of Texas – Austin; 2015. Available from: http://hdl.handle.net/2152/31416

30. Wu, Yin, 1980-. A new operability and predictability enhanced riser control system for deepwater marine operation: an integrated riser hybrid tensioning system.

Degree: PhD, Electrical and Computer Engineering, 2015, University of Texas – Austin

URL: http://hdl.handle.net/2152/32835

► This dissertation presents a novel riser hybrid tensioning system by integrating an electrically powered riser tensioning system into existing hydro-pneumatic tensioners. Compared to current passive… (more)

▼ This dissertation presents a novel riser hybrid tensioning system by integrating an electrically powered riser tensioning system into existing hydro-pneumatic tensioners. Compared to current passive hydro-pneumatic tensioners, this new riser hybrid tensioning system provides the capability of dynamically controlling the tension in the riser string. This feature opens a wide horizon of different active riser control strategies to achieve the systematic riser control solution. The objective of this study is to increase the predictability and safety of the whole riser system, and to extend the operability of the riser tensioning system into other operations. An overall structure framework of this novel hybrid riser tensioning system is proposed, comprising a direct driven electrical tensioners, hydro-pneumatic tensioners, a super-capacitor based energy storage system, power dissipaters, an overall tension controller and a power management controller. Hardware configurations are suggested. A riser data logging system is introduced, providing more comprehensive riser status data. A power management control strategy and overall coordination architecture to integrate the whole system are proposed. As the main functionality of the riser tensioning system, a new active heave compensation control strategy is analyzed in detail, by using this new riser hybrid tensioning system. A LQG controller and a H [subscript infinity symbol] controller are designed. The position chasing technique produces predictive and accurate tension commands for the electrical tensioners. Both Matlab simulation and hardware implementation confirm the feasibility of this concept, and further verifies that a more accurate control performance could be achieved by the electrical tensioners 180° compensating the tension fluctuation caused by the hydro-pneumatic tensioners. A novel testability and predictability enhanced anti-recoil control algorithm is implemented in the electrical tensioners. A position control strategy is proposed with the objective of moving the riser body to a desired elevation height in a predictive manner. A system model and a Kalman estimator are built, and a LQG controller is designed. The simulation demonstrates that the riser lifting height can adjust to any reasonable value for different test environment. This anti-recoil control concept reduces the risk of catastrophic damage, and allows us to perform maintenance tests much more frequently to bring back operator’s confidence. During harsh sea state, the VIV can be suppressed by using the dynamic control of the hybrid tensioning system, at frequencies and magnitudes made available by the electrical tensioning system. The objective is to achieve the VIV suppression by avoiding the excitation of the oscillation locking into the resonance conditions, and by reducing oscillation energy to be built in riser. A modal analysis of a tensioned Euler-Bernoulli beam is studied. Two control methods are proposed. Simulations results demonstrate that the oscillation is… Advisors/Committee Members: Baldick, Ross (advisor), Kwasinski, Alexis (committee member), Santoso, Surya (committee member), Edgar, Thomas (committee member), Pan, Zhigang (committee member).

Subjects/Keywords: Marine riser; Hybrid tensioning system; Active heave compensation; Anti-recoil; Vortex-induced vibration suppression

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APA (6^th Edition):

Wu, Yin, 1. (2015). A new operability and predictability enhanced riser control system for deepwater marine operation: an integrated riser hybrid tensioning system. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/32835

Chicago Manual of Style (16^th Edition):

Wu, Yin, 1980-. “A new operability and predictability enhanced riser control system for deepwater marine operation: an integrated riser hybrid tensioning system.” 2015. Doctoral Dissertation, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/32835.

MLA Handbook (7^th Edition):

Wu, Yin, 1980-. “A new operability and predictability enhanced riser control system for deepwater marine operation: an integrated riser hybrid tensioning system.” 2015. Web. 25 Jan 2021.

Vancouver:

Wu, Yin 1. A new operability and predictability enhanced riser control system for deepwater marine operation: an integrated riser hybrid tensioning system. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2015. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/32835.

Council of Science Editors:

Wu, Yin 1. A new operability and predictability enhanced riser control system for deepwater marine operation: an integrated riser hybrid tensioning system. [Doctoral Dissertation]. University of Texas – Austin; 2015. Available from: http://hdl.handle.net/2152/32835

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Open Access Theses and Dissertations