1. UiT The Arctic University of Norway,Dept. of Electrical Engineering,Narvik,Norway
2. Politecnico di Bari,Dept. of Electrical and Information Engineering,Bari,Italy
3. Delft University of Technology,Dept. of Electrical Sustainable Energy,Delft,Netherland
4. University of South-Eastern Norway,Dept. of Electrical engineering and ICT,Porsgrunn,Norway