1. Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute, University of Nottingham Ningbo China,Ningbo,China
2. University of Nottingham Ningbo China,Department of Electrical and Electronic Engineering,Ningbo,China
3. University of Kiel,Chair of Power Electronics,Kiel,Germany
4. University of Nottingham,Department of Electrical and Electronic Engineering,Nottingham,U.K.