1. State Grid Liandu District Power Supply Company, State Grid Zhejiang Electric Power Co., Ltd,Lishui,China
2. Polytechnic Institute Zhejiang University, Hangzhou Warui Electric Power Technology Co., Ltd,Hangzhou,China
3. College of Electrical Engineering Zhejiang University, Hangzhou Warui Electric Power Technology Co., Ltd,Hangzhou,China
4. College of Electrical Engineering, Zhejiang University,Hangzhou,China