1. School of Electrical EngineeringBeijing Jiaotong UniversityBeijingPeople's Republic of China
2. CRRC Dalian R&D Co.,LtdDalianPeople's Republic of China
3. School of AutomationCentral South UniversityChangshaPeople's Republic of China
4. Hunan Provincial Key Laboratory of Power Electronics Equipment and GridCentral South UniversityChangshaPeople's Republic of China