1. Electrical Engineering, Universitat Politcnica de Catalunya, 16767 Barcelona, Spain, 08028 (e-mail: saman.dadjo@upc.edu)
2. Energy Technology, VITO, Genk, Belgium, (e-mail: sajjad.fekriasl@vito.be)
3. CITCEA-UPC, Barcelona, Spain, 08028 (e-mail: eduardo.prieto-araujo@citcea.upc.edu)
4. Electrical Engineering (ESAT), Div. ELECTA, KU Leuven, Heverlee, Belgium, 3001 (e-mail: jef.beerten@esat.kuleuven.be)
5. CITCEA-UPC, Barcelona, Spain, 08028 (e-mail: oriol.gomis@upc.edu)