1. Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System, Hubei University of Technology, Wuhan 430068, China
2. Wuhan Electric Power Technical College, Wuhan 430079, China
3. Electric Power Research Institute of Guangxi Power Grid Co., Ltd., Nanning 530000, China
4. School of Electrical Engineering, Wuhan University, Wuhan 430072, China