1. College of Electrical and Information Engineering, the Engineering Research Center of Advanced Semiconductor Technology and Application of Ministry of Education, the National Key Laboratory of Power Semiconductor and Integration Technology, and the Changsha Semiconductor Technology and Application Innovation Research Institute, Hunan University, Changsha, China
2. College of Electrical and Information Engineering, Hunan University, Changsha, China
3. State Grid Jiangsu Electric Power Company Ltd., Suzhou, China