1. School of Electronic Information and Electrical Engineering and the Key Laboratory of Control of Power Transmission and Conversion, Ministry of Education, Shanghai Jiao Tong University, Shanghai, China
2. Department of Electrical Engineering, University of Shanghai for Science and Technology, Shanghai, China
3. School of Electrical and Information Engineering, Hunan University, Changsha, China
4. School of Electrical Engineering, Chongqing University, Chongqing, China
5. College of Information Science and Technology, Zhejiang Shuren University, Hangzhou, China