1. State Grid Hebei Electric Power Co., Ltd, Shijiazhuang, People’s Republic of China
2. School of Electrical and Electronic Engineering, Shijiazhuang Tiedao University, Shijiazhuang, People’s Republic of China
3. Hebei Provincial Collaborative Innovation Center of Transportation Power Grid Intelligent Integration Technology and Equipment, Shijiazhuang Tiedao University, Shijiazhuang, People’s Republic of China