1. School of Electric Power, Shenyang Institute of Engineering, Shenyang 110136, China
2. State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102211, China
3. College of Computer and Control Engineering, Northeast Forestry University, Harbin 150040, China
4. Harbin Power Supply Company, State Grid Heilongjiang Co., Ltd., Harbin 150010, China
5. Suzhou Power Supply Company, State Grid Jiangsu Co., Ltd., Suzhou 215004, China