Control optimization of active-NPC power electronic convertershttp://www.library.tuc.gr/artemis/DT2013-0321/DT2013-0321.pdfhttp://purl.tuc.gr/dl/dias/1DFFB5D9-7518-4285-8F4B-105D145D3E52Control optimization of active-NPC power electronic convertersfree2014-03-24application/pdf