1. Department of Electrical Engineering; University Carlos III de Madrid; Av. De la Universidad 30, 28911 Leganés Madrid Spain
2. INESC TEC-INESC Technology and Science (formerly INESC Porto) and FEUP-Faculty of Engineering; University of Porto; Campus da FEUP, Rua Dr. Roberto Frias 378 4200-465 Porto Portugal
3. PERSEE-Center for Processes, Renewable Energies & Energy Systems; MINES ParisTech; Rue Claude Daunesse F-06904 Sophia Antipolis France