1. School of Electrical Engineering and Automation, Anhui University, Hefei 230601, People’s Republic of China
2. National Engineering Laboratory of Energy-Saving Motor & Control Technology, Anhui University, Hefei 230601, People’s Republic of China
3. Anhui Key Laboratory of Industrial Energy-Saving and Safety, Anhui University, Hefei 230601, People’s Republic of China
4. Anhui Collaborative Innovation Center of Industrial Energy-Saving and Power Quality Control, Anhui University, Hefei, 230601, People’s Republic of China