1. Department of Electrical EngineeringTechnical University of DenmarkCopenhagenDenmark
2. Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of EducationSchool of Electrical EngineeringShandong UniversityJi'nan250061People's Republic of China
3. State Key Laboratory of Alternate Electrical Power System with Renewable Energy SourcesSchool of Control and Computer EngineeringNorth China Electric Power UniversityBeijing102206People's Republic of China