1. Department of Industrial Systems Engineering and Design, Universitat Jaume I, Av. Sos Baynat, s/n 12071 Castelló, Spain
2. Power Electronics and Control Area, IKERLAN-IK4, P° J. M. Arizmendiarrieta, 2, 20500 Arrasate, Gipuzkoa, Spain
3. Department of Electrical Engineering, Technical University of Catalonia, C. Colon, 1, 08222 Terrassa, Barcelona, Spain