Simulation Research on the Impact of Different Control Strategies on Transient Characteristics of DFIG

In this paper, two simulation models of DFIG are set up respectively based on direct power control strategy and vector control strategy by using PSCAD simulation platform, on which the voltage oriented vector control and direct power control strategy are applied at grid side, and the stator flux oriented vector control and direct power control strategy are used at rotor side. Then the transient properties of wind turbine based on different control strategies when different mild and serious voltage dip caused by symmetric fault are analyzed based on the different control strategies. And the characteristic of short-circuit current for wind turbine based on different control strategies is analyzed when the crowbar circuit is put into at different times. The stabilizing effect on DC bus voltage when grid-side converter doesnt output reactive power based on different control strategies is analyzed as well as the supporting effect on network voltage when grid-side converter outputs reactive power. In the end, the impact of different control strategies on fault transient characteristics of DFIG is summarized.