1. Faculty of Electric Power Engineering, Kunming University of Science and Technology,Kunming,China,650500
2. College of Electrical Engineering, Zhejiang University,Hangzhou,China,310027
3. Company of Kunming Bureau of CSG EHV Transmission Company,Kunming,China,650217
4. School of Electrical Engineering and Electronics, University of Liverpool,Liverpool,UK,L69 3GJ
5. Company of Electric Power Science Research Institute, State Grid Zhejiang Electric Power Company Ltd.,Hangzhou,China,310014