1. College of Electrical and Information Engineering, Hunan University, Changsha, China
2. Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment, Hubei University of Technology, Wuhan, China
3. State Key Laboratory of Power Grid Environmental Protection, China Electric Power Research Institute, Wuhan, China
4. School of Electrical Engineering and Automation, Wuhan University, Wuhan, China
5. Electric Power Research Institute, China Southern Power Grid, Guangzhou, China
6. Department of Electrical, Electronic and Information Engineering “Guglielmo Marconi,” University of Bologna, Bologna, Italy