1. School of Electrical and Electronic Engineering, Hubei University of Technology, Wuhan 430068, China
2. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China
3. Wuhan NARI Limited Company of State Grid Electric Power Research Institute, Wuhan 430074, China
4. Maintenance Company of State Grid Xinjiang Electric Power Co., Ltd., Ürümqi, Xinjiang 830000, China