1. National Rail Transportation Electrification and Automation Engineering Technology Research Center, Southwest Jiaotong University, Chengdu, China
2. State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing, China
3. School of Electrical, Electronics and Computer Engineering, University of Western Australia, Crawley, WA, Australia
4. AAU Energy, Aalborg University, Aalborg, Denmark