1. Key Laboratory of Railway Industry of Maglev, Tongji University, Shanghai, China
2. National Rail Transit Electrification and Automation Engineering Technique Research Centre and SWJTU-Leeds Joint School, Southwest Jiaotong University, Chengdu, China
3. School of Electrical Engineering, Southwest Jiaotong University, Chengdu, China
4. China State Railway Group Company, Ltd., Beijing, China
5. China Railway Eryuan Engineering Group CO. LTD., Chengdu, China