1. International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, State Key Laboratory of Advanced Electromagnetic Technology, School of Electrical Engineering and Electronics, Huazhong University of Science and Technology, Wuhan 430074, China
2. State Key Laboratory of Advanced Electromagnetic Technology, School of Electrical Engineering and Electronics, Huazhong University of Science and Technology, Wuhan 430074, China
3. Digital Grid Research Institute, China Southern Power Grid, Guangzhou 510670, China