ISSN 2196-5625 CN 32-1884/TK
1 School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China 2 Robert W. Galvin Center for Electricity Innovation, Illinois Institute of Technology, Chicago, IL, USA
National NaturalScience Foundation of China (No. 51377035) and NSFC-RCUK_EPSRC(No. 51361130153). The authors also thank the anonymousreviewers and the editor for their valuable comments.