Dr.Yanfeng Chen received the M.E. degree in power electronics technology from Wuhan University, China(1995), and the Ph.D degree in circuits and systems from South China University of Technology, China(2000). From November 2005 to December 2006, she was a Research Associate with the Department of Electronic and Information Engineering, Hong Kong Polytechnic University, Hong Kong. She is currently a Professor at the School of Electric Power, South China University of Technology, Guangzhou, China. Her main research interests are modeling and analysis of nonlinear systems and power electronics. Dr. Bo Zhang was born in Shanghai, China, in 1962. He received the B.S. degree in electrical engineering from Zhejiang University, Hangzhou, China, in 1982, the M.S. degree in power electronics from Southwest Jiaotong University, Chengdu, China, in 1988, and the Ph.D. degree in power electronics from Nanjing University of Aeronautics and Astronautics, Nanjing, China, in 1994. He is currently a Professor and the Vice Dean at the school of Electric Power, South China University of Technology, Guangzhou, China. He has authored or coauthored more than 350 papers and has 17 patents. His current research interests include nonlinear analysis and control of power electronics and AC drives.