1. School of Electrical Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China
2. Urumqi Electric Power Company, SGCC, Urumqi 830011, People's Republic of China
3. School of Electrical Engineering, Guizhou University, Guiyang 550025, People's Republic of China
4. School of Applied Science and Engineering, Aston University, Birmingham B4 7ET, United Kingdom
5. China Electric Power Research Institute, Beijing 100192, People's Republic of China
6. Northeast Electric Power University, Jilin 132012, People's Republic of China