1. Shandong University of Science and Technology, College of Electrical Engineering and Automation,Qingdao,China
2. Guangdong Power Grid Corporation, Huizhou Power Supply Bureau Company,Huizhou,China
3. Shandong University of Science and Technology, College of Economics and Management,Qingdao,China
4. State Grid Heilongjiang Electric Power Company Limited,Harbin,China