1. College of Taiyuan University of Technology,Shanxi Key Laboratory of Power System Operation and Control,Taiyuan,China
2. State Grid UHV Transmission CO.OF SEPC, State Grid Power Supply Company,Taiyuan,China
3. State Grid UHV Transformation CO.OF SEPC, State Grid Power Supply Company,Taiyuan,China
4. State Grid Power Supply Company,Taiyuan,China