1. School of Electrical Engineering and Automation, Anhui University, Hefei, China
2. School of Electrical Engineering, Xi’an University of Technology, Xi’an, China
3. Power Research Institute of State Grid Ningxia Electric Power Company Ltd., Yinchuan, China
4. Institute for Advanced Research, Anhui University of Science and Technology, Hefei, China
5. School of Electrical and Electronic Engineering, Nanyang Technological University, Jurong West, Singapore