1. Fraunhofer Institute for Wind Energy Systems IWES,Hannover,Germany,30159
2. University of Bremen,Institute for Electrical Drives, Power Electronics and Devices,Bremen,Germany,28359
3. Leibniz University Hannover,Institute for Drive Systems and Power Electronics,Hannover,Germany,30167
4. Leibniz University Hannover,Institute of Electrical Engineering and Measurement Technology,Hannover,Germany,30167