1. Zhejiang University,College of Electrical Engineering,Hangzhou,Zhejiang,China
2. CRRC Qingdao SiFang co.,LDT,State Key Laboratory of High-speed Maglev Transportation Technology,Qingdao,China
3. Zhejiang University Advanced Electrical Equipment Innovation Center,Hangzhou,Zhejiang,China
4. Tiangong University,School of Electrical Engineering,Tianjin,China