1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy SourcesNorth China Electric Power UniversityBaoding071000People's Republic of China
2. Hebei Key Laboratory of Distributed Energy Storage and Micro‐gridNorth China Electric Power UniversityBaoding071003People's Republic of China
3. School of Electrical and Computer EngineeringNorth Carolina Agricultural and Technical State UniversityGreensboroNC27411USA
4. State Grid Hebei Electric Power Supply Co., Ltd.Shijiazhuang050000People's Republic of China