1. School of Automotive and Transportation Engineering, Hefei University of Technology, Hefei, 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. Quanzhou Institute of Equipment Manufacturing, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Jinjiang, China