1. Zhongyuan University of Technology,College of Electronic and Information Engineering,Zhengzhou,Henan Province, China,450007
2. Shanghai University,School of Mechatronic Engineering and Automation,Shanghai,China,200072
3. Zhengzhou Wending Electric Power Design Co., Ltd,Substation Department,Zhengzhou,Henan Province, China,450001
4. Institute of Economic Technology,State Grid Nanyang Power Supply Company,Nanyang,Henan Province, China,473000