1. Tianjin Key Laboratory of Advanced Technology of Electrical Engineering and Energy, School of Electrical Engineering and Automation, Tiangong University, Tianjin 300387, People’s Republic of China
2. School of Mechanical Engineering, Tiangong University, Tianjin 300387, People’s Republic of China
3. Department of Electrical Engineering, City University of Hong Kong, Kowloon 999077, People’s Republic of China