1. Department of Electrical Engineering and the State Key Laboratory of Power System, Tsinghua University, Beijing, China
2. State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin, China
3. Tianjin University of Technology, Tianjin, China
4. School of Electrical Engineering and Automation, Wuhan University, Wuhan, China
5. Department of Electrical Engineering, City University of Hong Kong, Hong Kong
6. Department of Electronic Engineering, Tsinghua University, Beijing, China