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  Many people have contributed to the production of this dissertation, although only my name appears on the cover. Hence, I absolutely owe my gratitude to all those people who encouraged and helped me to nally nish this dissertation. My deepest gratitude is to my advisors, Professor Jing Sun and Professor James S. Freudenberg, at the University of Michigan. Their consistent encouragement and support helped me overcome many challenges and nish this dissertation. I am extremely thankful to Professor Chunting Mi. I spent almost one year in his power electronics lab to build our hybrid power system testbed which has signicantly contributed to this dissertation. I am also thankful to Professor Ryan Eustice for his constructive comments and suggestions.