1. School of Automotive and Traffic Engineering Jiangsu University of Technology Changzhou 213001 China
2. State Key Lab of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710049 China
3. School of Low-Carbon Energy and Power Engineering China University of Mining and Technology Xuzhou 221116 China
4. Department of Computer Science Changzhou Institute of Technology Changzhou 213032 China