Funding for this research was provided by:
Department of Science and Technology of Sichuan Province (2019YJ0227)
National Natural Science Foundation of China (51605397)
Self-determined Project of State Key Laboratory of Traction Power (2019TPL_T02)
Article History
Received: 22 December 2018
Revised: 13 October 2019
Accepted: 14 October 2019
First Online: 24 October 2019