1. School of Electrical and Information Engineering Tianjin University Tianjin China
2. State Grid Tianjin Chengdong Electric Power Supply Company Tianjin China
3. Department of Electrical and Computer Engineering University of Connecticut Storrs USA
4. Department of Electrical and Electronic Engineering Hong Kong Polytechnic University Kowloon Hong Kong
5. Department of Electronic and Electrical Engineering University of Strathclyde Glasgow UK