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Protection and Automation of Microgrids for Flexible Distribution of Energy and Storage Resources

Haj-ahmed, Mohammed A.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1430694499

Abstract Details

2015, Doctor of Philosophy, Ohio State University, Electrical and Computer Engineering.
The increased penetration of distributed generation (DG) in distribution networks has a direct impact on the network reliability, protection, and stability. Traditional protection strategies require extensive investigation as more DGs get introduced into the network. Inverter-based DGs are of particular concern in microgrid protection and automation since their controllers play a principal role in the DG behavior. Controllers of the inverter-based DGs regulate their output voltage, while some commercial inverter-based DG types use internal control loops to regulate the output current. Those commercial controllers may switch their control mode from current control mode to voltage control mode or vice versa. Switching from one mode to another will directly affect the fault characteristics of the generator and require major modifications on the protection scheme. Coordination between the controller’s functions and the protection strategy is done adaptively as the control mode changes. On the other hand, Flexible Distribution of EneRgy and Storage devices (FDERS), which is a newly proposed framework aims to increase microgrid controllability and robustness, adjust the interconnection impedance between a distributed generator and a load by changing the controller reference voltage. This adjustment causes protection problems that may lead to maloperation of current-based protection relays. Coordination between the controller actions and protection devices is done this time by adding more constraints on current-based relays. Flexible Distribution of EneRgy and Storage resources (FDERS) was a recently proposed concept for islanded microgrids, and it offers several benefits including extended system controllability with improved system robustness, optimal energy resource deployment and increased lifetime. As the FDERS also involves a modification of DER controls, its implementation is found to have an impact on the distribution system protection schemes. In this work, I propose new protection strategies that are coordinated with controller’s actions done in multi-function inverters or by implementing FDERS systems. The newly proposed protection strategies are recommended for dependable and secure system operation. In addition, a thorough investigation of CERTS/AEP microgrid protection scheme is presented in this work; recommendations given are based on improved coordination between different protection devices in the microgrid.
Mahesh Illindala (Advisor)
Jin Wang (Committee Member)
Jiankang Wang (Committee Member)
144 p.
Electrical Engineering
Power system protection, microgrids protection, flexible distribution

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Citations

  • Haj-ahmed, M. A. (2015). Protection and Automation of Microgrids for Flexible Distribution of Energy and Storage Resources [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1430694499

    APA Style (7th edition)

  • Haj-ahmed, Mohammed. Protection and Automation of Microgrids for Flexible Distribution of Energy and Storage Resources. 2015. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1430694499.

    MLA Style (8th edition)

  • Haj-ahmed, Mohammed. "Protection and Automation of Microgrids for Flexible Distribution of Energy and Storage Resources." Doctoral dissertation, Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1430694499

    Chicago Manual of Style (17th edition)

osu1430694499
2,354
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This open access ETD is published by The Ohio State University and OhioLINK.