Full-converter wind generator modelling for transient stability studies

In this paper the impact of variable speed wind generators on power system transient stability is examined using a generic full converter wind generator model. First the developed model, appropriate for power system stability studies, is described and the grid-side converter control strategy during voltage dips is analyzed. Next, the contribution of a wind farm equipped with full converter wind turbines to the transient stability of a power system is examined. Simulations of a test system show that transient stability margins can be significantly improved, if the wind farm active and reactive power injection is reconfigured in order to satisfy typical present-day grid codes. It is also shown that transient stability can be further improved if the power converters can withstand an additional amount of reactive current during low voltage conditions.