1. Associate Professor, College of Electrical and Information Engineering, Zhengzhou Univ. of Light Industry, Zhengzhou 450002, Henan Province, PR China.
2. Postgraduate Student, College of Electrical and Information Engineering, Zhengzhou Univ. of Light Industry, Zhengzhou 450002, Henan Province, PR China.
3. Professor, Dept. of Electrical Power Engineering and Mechatronics, Tallinn Univ. of Technology, Tallinn 19086, Estonia (corresponding author). ORCID: .
4. Lecturer, College of Electrical and Information Engineering, Zhengzhou Univ. of Light Industry, Zhengzhou 450002, Henan Province, PR China.