1. Center for more-electric-aircraft power system; Nanjing University of Aeronautics and Astronautics; Nanjing 211106 China
2. State Grid Xiamen Electric Power Supply Company; Xiamen 361004 China
3. State Grid Jiangsu Electric Power Co. Ltd. Research Institute; Nanjing 211103 China
4. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources; North China Electric Power University; Beijing 102206 China