1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy SourcesNorth China Electric Power UniversityBeijing102206People's Republic of China
2. State Key Laboratory of Advanced Transmission TechnologyGlobal Energy Interconnection Research InstituteBeijing102211People's Republic of China
3. State Grid Chongqing Nan'an Power Supply CompanyChongqing400060People's Republic of China