1. School of Rail Transportation, Soochow University, Suzhou, China
2. Electrical and Electronics Department, Xi'an Jiaotong-Liverpool University, Suzhou, China
3. Department of Electrical, Electronic and Computer Engineering, University of Western Australia, Perth, WA, Australia
4. Power Electronics Machines and Control Group, University of Nottingham, Nottingham, U.K.
5. School of Software and Electrical Engineering, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Victoria, VIC, Australia
6. Faculty of Engineering, Universidad San Sebastian Santiago, Santiago, Chile