1. Global Energy Interconnection Development and Cooperation Organization,State Grid Corporation of China,Beijing,P.R. China
2. Huaihua University,No.138 Jinhai Road,Huaihua, Hunan,P.R. China,418000
3. State Power Economic Research Institute of State Grid Corporation of China,Beijing,P.R. China
4. Pennsylvania State University,Center for Research in Knowledge Communications State College,Department of Electrical Engineering,PA,U.S.A.