1. University of Illinois Urbana-Champaign Institute, Zhejiang University, Hangzhou, China
2. School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore
3. College of Electrical Engineering, Zhejiang University, Hangzhou, China
4. Department of Energy Technology, Aalborg University, 9220, Aalborg East, Denmark
5. Department of Electrical Engineering, University of Arkansas, Fayetteville, USA