1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, China
2. Electric Power Research Institute of China Southern Power Grid Company Ltd., Guangzhou, China
3. China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, Wuhan, China
4. Department of Electrical Engineering, School of Mechatronic Engineering and Automation, Shanghai University, Shanghai, China