1. School of Electrical Engineering, Guangxi University, Nanning 530004, China
2. Data Recovery Key Laboratory of Sichuan Province, Neijiang Normal University, Neijiang 641100, China
3. Guangxi Key Laboratory of intelligent Control and Maintenance of Power Equipment, Guangxi University, Nanning 530004, China
4. School of Electrical and Electronic Engineering, Wuhan Polytechnic University, Wuhan 430010, China