Dr. Hongwei Ma received the B.S. degree in electrical engineering from Harbin Institute of Technology, Harbin, China, in 2008, and the Ph.D. degree in electrical engineering from Tsinghua University, Beijing, China, in 2013. He was a visiting scholar at School of Engineering, University of Wisconsin—Madison, USA, in 2015, and is currently a researcher and a master supervisor with School of Automation, Beijing Institute of Technology, Beijing, China. His current research interests include renewable energy, energy storage, power electronics, motor drives, and optimization control. He has authored or co-authored more than 20 books, chapters, journal articles, and conference papers. He is a IEEE and IES member and a reviewer for some international journals and has chaired several international conferences’ sessions. Professor Yongdong Li received the B.S. degree in electrical engineering from Harbin Institute of Technology, Harbin, China, in 1982 and the M.S. and Ph.D. degrees in electrical engineering from the Department of Electrical Engineering, Institut National Polytechnique de Toulouse, Toulouse, France, in 1984 and 1987, respectively. He is currently a professor in the Department of Electrical Engineering, Tsinghua University, Beijing, China, also a guest professor with Institut National Polytechnique de Toulous, France, and Harbin Institute of Technology, China, a distinguished professor of Delta Scholar Program, a IET fellow, and a IEEE senior member. His research interests include the high capacity power electronics converter and its application on high-voltage variable frequency speed regulation, renewable energy generation, electrical drive for high-speed railway, and integrated full electrical propulsion for marine. He has authored or co-authored more than 300 books, chapters, journal articles, and conference papers. He is working as the vice-chair at Research Center of Power Electronics and the vice-president at Institute of New Concept Vehicle, Tsinghua University. Associate Professor Lie Xu received the B.S. degree in electrical and electronics engineering from Beijing University of Aeronautics and Astronautics, Beijing, China, in 2003, and the M.S. and Ph.D. degrees in electrical and electronics engineering from the University of Nottingham, Nottingham, UK, in 2004 and 2008, respectively. From 2008 to 2010, he was a research fellow in the Department of Electrical and Electronics Engineering, the University of Nottingham. He is currently an associate professor in the Department of Electrical Engineering, Tsinghua University, Beijing, China. His research interests include multilevel converter, direct AC–AC power conversion, and multilevel matrix converter. He has authored or co-authored more than 40 books, chapters, journal articles, and conference papers. Professor Jianyun Chai received the B.S. and Ph.D. degrees in electrical engineering from Tsinghua University, Beijing, China, in 1984 and 1989, respectively. He has eight years of experience in industry as an engineer. He is currently a professor in the Department of Electrical Engineering, Tsinghua University. His research interests include renewable energy power systems, design and control of special motors and generators, and power electronic drive systems.
