1. Department of Systems and Automatic Control, Faculty of Engineering of Vitoria-Gasteiz, University of the Basque Country (UPV/EHU), C/Nieves Cano 12, 01006 Vitoria-Gasteiz, Spain
2. Center for Cooperative Research on Alternative Energies (CIC EnergiGUNE), Basque Research and Technology Alliance (BRTA), Parque Tecnológico de Alava, Albert Eisntein 48, 01510 Vitoria-Gasteiz, Spain
3. Bcare. C/Hernanos Lumiere 48, 01510 Miñano, Spain