1. Electric Power Research Institute,China Southern Power Grid,Guangzhou,China
2. Shantou Power Supply Company,Guangdong Power Grid,Shantou,China
3. Changsha University of Science & Technology,Changsha,China
4. Huizhou Power Supply Company,Guangdong Power Grid,Huizhou,China
5. Duyun Power Supply Company,Guizhou Power Grid,Duyun,China