Comparison between three-phase structures of two and three branches with ancillary services capabilities in type-3 wind turbines: Flying capacitor topology

The use of multilevel converters has been a trend in back-to-back converters employed in type-3 turbines based on doubly-fed induction generator (DFIG). In this sense, this work aims to compare the performance of three-phase converters of three-levels flying capacitor topology of two branches (FC-2B) and three branches (FC-3B). These structures are used like grid-side converter (GSC) with the capability to provide ancillary services on harmonic compensation and reactive power support. This study uses simulation results via PSCAD/EMTDC software. As a preliminary stage for future experimental trials, this work demonstrates that FC-2B is as efficient as FC-3B.