1. School of Electrical EngineeringXi'an Jiaotong UniversityXi'anPeople's Republic of China
2. School of Electrical and Information EngineeringTianjin UniversityTianjinPeople's Republic of China
3. Department of Electrical EngineeringThe Hong Kong Polytechnic UniversityHong KongPeople's Republic of China
4. State Key Laboratory of Alternate Electrical Power System with Renewable Energy SourcesNorth China Electric Power UniversityPeople's Republic of China