1. State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan430074People's Republic of China
2. Department of Electrical Engineering, Center for Electric Power and EnergyTechnical University of Denmark2800 Kgs.LyngbyDenmark
3. Department of Energy TechnologyAalborg UniversityAalborgDK9220Denmark