1. The Research Institute of Power Drive and Control, Shanghai Maritime University, Shanghai, People’s Republic of China
2. Institut de Recherche en Energie Electrique de Nantes Atlantique (IREENA), University of Nantes, Saint-Nazaire, France
3. Institut de Recherche Dupuy de Lôme (UMR CNRS 6027 IRDL), University of Brest, Brest, France