In the future smart grid, it is a significant trend to integrate large capacity renewable energy into medium voltage (MV) DC grids. The high power conversion techniques for wind generation, photovoltaic generation and hydrogen energy system integrated into MVDC grids are reviewed and compared in this lecture, including the system configurations, AC-DC and DC-DC converter designs, control strategies and fault protection. Novel solutions of DC grid-connected photovoltaic generation system are presented, providing new ways to integrate solar energy to DC grids with high efficiency and high power density. As the key element of high power isolated DC-DC converters, high frequency transformers with high withstand voltage are studied in terms of multi-physics modeling, magnetic integration, insulation design, thermal design and multi-objective optimization.
Speaker:
Kai Sun (M'12-SM'16) received the B.E., M.E., and Ph.D. degrees in electrical engineering from Tsinghua University, in 2000, 2002, and 2006, respectively. He joined the faculty of Electrical Engineering, Tsinghua University, in 2006, where he is currently a Tenured Associate Professor (Research Professor). From Sep 2009 to Aug 2010, he was a Visiting Scholar at Department of Energy Technology, Aalborg University, Aalborg, Denmark. From Jan to Aug 2017, he was a Visiting Professor at Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Canada. His research interests include power electronics for renewable generation systems, microgrids, and energy internet.
Dr. Sun serves as an Associate Editor for IEEE Transactions on Power Electronics, IEEE Journal of Emerging and Selected Topics in Power Electronics, and Journal of Power Electronics. Dr. Sun served as the TPC Vice Chair of IEEE ECCE2017 and IEEE ECCE-Asia2017, the Organization Committee Chair of IEEE eGrid2019, and the Publicity Chair of IEEE ECCE2020. He also served as the General Co-Chair of 2018 International Future Energy Challenge (IFEC2018). Dr. Sun serves as PELS Asia Pacific Regional Vice Chair, PELS Beijing Chapter Chair and PELS Electronic Power Grid Systems Technical Committee (TC8) Secretary. He was a recipient of Delta Young Scholar Award in 2013, and Youth Award of China Power Supply Society (CPSS) in 2017, and IEEETransactions on Power Electronics' Outstanding Reviewers Award in 2019. Dr. Sun has been selected as IEEE PELS Distinguished Lecturer (2021-2022).
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