1. School of Electrical and Information Engineering; Changsha University of Science and Technology; 141 Qingyuan Road Tianxin Qu Changsha 410114 China
2. State Grid Hunan Electric Power Corporation Research Institute; 19 Shuidian Street Changsha Hunan 410007 China
3. Zhuhai Electric Power Company; 19 Haihe Street Zhuhai Guangdong 519000 China
4. EHV Power Transmission Company; China Southern Power Grid; 116 Tianhe Street Guangzho Guangdong China