Performance evaluation of series and parallel connected grid side converters of DFIG

With the increased penetration of wind power in the system having new electricity grid code, it is required for the wind power generator to fulfill the same requirements as conventional power plants. In this paper, series and parallel connected grid side converters with conventional doubly fed induction generator (DFIG) scheme is explored to suit the Grid Code Requirements (GCRs) during static and dynamic conditions. A dynamic model and control structure for the series architecture are developed and the performance of the system is analyzed with three-phase fault, voltage sag and step response to reactive power injection. The reactive power capability curves of conventional and modified DFIG schemes through the use of performance capability curves has been developed.