1. Shanxi Key Laboratory of Mining Electrical Equipment and Intelligent ControlCollege of Electrical and Power Engineering, Taiyuan University of TechnologyTaiyuan030024People's Republic of China
2. Department of Electrical, Electronic and Information Engineering‘Guglielmo Marconi’, University of BolognaViale Risorgimento 2Bologna40136Italy
3. Key Laboratory of Smart Grid of Education MinistrySchool of Electrical and Information Engineering Tianjin UniversityTianjin300072People's Republic of China
4. State Key Laboratory of Alternate Electrical Power System with Renewable Energy SourcesNorth China Electric Power UniversityChangping DistrictBeijing102206People's Republic of China