1. College of Electrical and Information Engineering, Hunan University, Changsha, China
2. College of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha, China
3. Galvin Center for Electricity Innovation, Illinois Institute of Technology, Chicago, IL, USA
4. Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool, U.K.
5. Department of Marketing Operation, State Grid Hunan Power Supply Service Center (Metrology Center), Changsha, China
6. Integrated Energy Division, Integrated Energy Division of ENN Gas Company Ltd, Changsha, China