1. College of Electrical Engineering, Zhejiang University, Hangzhou, China
2. State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin, China
3. College of Electrical Engineering and the ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou, China
4. Department of Energy Technology, Aalborg University, Aalborg, Denmark