1. University of Seville,Department of Electrical Engineering,Seville,Spain
2. Escuela Técnica Superior de Ingenieros Industriales, Universidad Politécnica de Madrid,Electrical Engineering Department,Madrid,Spain
3. University of South-Eastern Norway,Department of Electrical Engineering,Porsgrunn,Norway
4. Technische Universiteit Delft,Department of Electrical Sustainable Energy,Delft,Netherlands