1. School of Electronic Information and Electrical Engineering (Key Laboratory of Power Transmission and Power Conversion Control, Ministry of Education), Shanghai Jiao Tong University, Shanghai, China
2. Department of Electrical Engineering and Intelligent Control, School of Energy Engineering, Xinjiang Institute of Engineering, Urumqi, China
3. Department of Electronic and Electrical Engineering, University of Bath, Bath, U.K.
4. School of Electrical Engineering, Shanghai Dianji University, Shanghai, China