1. College of Information and Electrical Engineering, China Agricultural University, Beijing, China
2. School of Electrical Engineering, Xi'an University of Technology, Xi'an, China
3. School of Electrical Engineering, Xi'an Jiaotong University, Xi'an, China
4. Anshun Power Supply Bureau, Guizhou Power Grid Company Ltd., Anshun, China
5. Jiangxi Electric Power Research Institute of State Grid, Jiangxi, China