1. Electric Power Science Research Institute, Guangdong Power Grid Limited Liability Company, Guangzhou 510062, China
2. School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China
3. Qingyuan Yingde Power Supply Bureau, Guangdong Power Grid Limited Liability Company, Guangzhou 513000, China
4. Foshan Shunde Power Supply Bureau, Guangdong Power Grid Limited Liability Company, Guangzhou 528300, China