1. Guangdong Power Grid Corporation Guangzhou,Power Grid Planning and Research Center,Guangdong,China
2. Dongguan power supply bureau Guangdong Power Grid Corporation,Dongguan,Guangdong,China
3. North China Electric Power University,Department of Economic Management,Baoding,Hebei,China
4. State Grid Jiangsu Electric Power Company,Zhenjiang Power Supply Company,Zhenjiang,Jiangsu,China