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Modeling, Simulation and Decentralized Control of Islanded Microgrids Farideh Doost Mohammadi

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Recommended Citation Mohammadi, Farideh Doost, "Modeling, Simulation and Decentralized Control of Islanded Microgrids" (2017). Graduate Theses, Dissertations, and Problem Reports. 7113. https://researchrepository.wvu.edu/etd/7113

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Modeling, Simulation and Decentralized Control of Islanded Microgrids

Farideh Doost Mohammadi

Dissertation submitted to the College of Engineering and Mineral Resources at West Virginia University in partial fulfillment of the requirements for the degree of

Doctor of Philosophy in Electrical Engineering Muhammad A. Choudhry, Ph.D. Yaser P. Fallah, Ph.D. Ali Feliachi, Ph.D., Chair Powsiri Klinkhachorn, Ph.D. Rong Luo, Ph.D. Lane Department of Computer Science and Electrical Engineering Morgantown, West Virginia 2016

Keywords: PQ and VSI inverter, H infinity Control, Multi agent, Microgrids Control, DGs Copyright 2017 Farideh Doost Mohammadi

Abstract

Modeling, Simulation and Decentralized Control of Islanded Microgrids Farideh Doost Mohammadi This thesis develops a comprehensive modular state-space model of microgrids containing inverter-based Distributed Energy Resources (DERs). The model is validated and then used for small signal stability enhancement and voltage and frequency control. State space models of various microgrid elements are first derived, which allow for the inclusion of any possible elements such as current controlled inverters that are missing in the literature. Then a complete state space model is obtained to complement the models that are available in the literature and whose objectives are system analysis only as compared to the purpose of this work which is stability enhancement and control design. Specifically, 1. Small signal stability is enhanced by adding current controlled inverters to the microgrid. 2. Decentralized secondary frequency and voltage control techniques are proposed. For secondary frequency control purposes, at first, the control strategies of different kinds of inverters and storage devices are described. Then, a novel solution is introduced for islanded microgrids by decomposing the system into virtual control areas. For the secondary voltage control an Average Consensus Algorithm (ACA) is used and applied on a network of agents which has been chosen optimally based on the required connectivity. The main purpose of the ACA is to keep the average voltage of all the buses at a desired level during islanding. Then another control strategy is proposed to improve the voltage profile. While the average voltage is kept fixed by the voltage controlled inverters, this voltage profile smoothness is obtained by dedicating zones to current controlled inverters and defining their responsibilities based on the location of the loads.

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Acknowledgements I bless God Almighty for His faithfulness in my life, and for the strength, sound health and sound mind He granted me throughout the period of the program. I am very grateful to my supervisor and mentor Dr Ali Feliachi for his advice, support and guidance over the years. He has impacted into my life an immense deal of knowledge and without him, this work would not have been accomplished. I also appreciate all the faculty member who have taught, encouraged and guided me in special and different ways. Special thanks go to Professor Muhammad Choudhry (WVU Lane Department of Computer Science and Electrical Engineering), Professor Yaser P. Fallah (WVU Lane Department of Computer Science and Electrical Engineering), Professor Powsiri Klinkhachorn (Lane department of Computer Science and Electrical Engineering), and Professor Rong Luo (WVU Department of Mathematics). Lastly, I dedicate this work to my supportive husband Hessam Keshtkar and my adorable son, Nikan Keshtkar.

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CONTENTS Contents ............................................................................................................................. iv List of Figures ..................................................................................................................... ix List of tables ......................................................................................................................xiii Notation a

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