1. Electric Power Research Institute,China Southern Power Grid,Guangzhou,China
2. Duyun Power Supply Bureau of Guizhou Power Grid Co, Ltd,Duyun,China
3. Shantou Power Supply Company,Guangdong Power Grid,Shantou,China
4. Electric Power Research Institute of Guangxi Power Grid,Nanning,China
5. Guangzhou Power Supply Company of Guangdong Power Grid,Guangzhou,China