1. Chengde Power Company State Grid Jibei Electric Power Co. Ltd.,Chengde,China
2. Tianjin University,School of Electical and Information Engineering,Tianjin,China
3. Electric Power Research Institute,State Grid Hebei Electric Power Limited Corporation,Shijiazhuang,China
4. Shijiazhuang Power Supply Branch State Grid Hebei Electric Power Limited Corporation,Shijiazhuang,China
5. Tangshan Power Supply Company State Grid Jibei Electric Power Company Limited,Tangshan,China