1. School of Electrical Engineering, Dalian University of Technology, Dalian 116024, China
2. China Electric Power Research Institute Co., Ltd., Beijing 100192, China
3. Electric Power Research Institute, State Grid Liaoning Electric Power Co., Ltd., Shenyang 110055, China
4. Langfang Power Supply Company, State Grid Jibei Electric Power Co., Ltd., Langfang 065099, China
5. Disaster Prevention and Reduction Center, State Grid Hunan Electric Power Co., Ltd., Changsha 410007, China