1. School of Energy, Power and Mechanical Engineering, North China Electric Power University, Baoding 071000, China
2. Hebei Key Laboratory of Electric Machinery Health Maintenance and Failure Prevention, North China Electric Power University, Baoding 071003, China
3. Key Laboratory of Icing and Anti/De-icing, China Aerodynamics Research and Development Center, Mianyang, Sichuan 621000, China
4. School of Electrical and Electronics Engineering, North China Electric Power University, Baoding 071000, China
5. School of Energy, Power, and Mechanical Engineering, North China Electric Power University, Beijing 102206, China