Development of Wind Turbine Systems with Parallel Connections of Different Types Generators - Costin, Mădălin; Voncilă, Elena; Voncilă, Ion; Nichita, Cristian; Fetecău, Grigore (The Annals of “Dunarea de Jos“ University of Galati. Fascicle III, Electrotechnics, Electronics, Automatic Control, Informatics, 2011)