1. State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources and the School of Control and Computer Engineering, North China Electric Power University, Beijing, China
2. College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao, China
3. School of Control and Computer Engineering, North China Electric Power University, Beijing, China
4. Shaanxi Key Laboratory of Space Solar Power Station System, School of Mechano-Electronic Engineering, Xidian University, Xi'an, China