1. School of Electrical Engineering, Chongqing University, Chongqing 400044, China
2. Department of Electrical and Electronic Engineering, The Hong Kong Polytechnic University, Hong Kong 999077, China
3. State Key Laboratory of Disaster Prevention & Reduction for Power Grid, Changsha University of Science & Technology, Changsha 410114, China
4. School of Mechatronic Engineering and Automation, Shanghai University, Shanghai 200444, China
5. State Grid Henan Electric Power Company Economic Research Institute, Zhengzhou 450000, China