1. College of Electrical Engineering, Sichuan University, Chengdu, China
2. School of Electrical Engineering, Xi'an Jiaotong University, Xi'an, China
3. Smart Grid Research Institute, Nanjing Institute of Technology, Nanjing, China
4. Department of Vehicle Engineering, Hefei University of Technology, Hefei, China
5. Quanzhou Institute of Equipment Manufacturing, Haixi Institutes, Chinese Academy of Sciences, Jinjiang, China