1. College of Electrical and Information Engineering, Hunan University, Changsha, China
2. School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, China
3. State Grid Hunan Electric Power Company Limited Economical and Technical Research Institute, Changsha, China
4. Robert W. Galvin Center for Electricity Innovation, Illinois Institute of Technology, Chicago, IL, USA
5. School of Engineering, Xi’an Jiaotong University, Xi’an, China