High voltage ride-through control method for DFIG-based wind turbines based on Resonant Controller

This paper analyzes the transient process of a DFIG based wind turbine in detail during general grid voltage swell conditions, especially the symmetrical voltage swell cases. And the key points influencing the turbines' high voltage ridethrough (HVRT) capability is then evaluated. Furthermore, a HVRT control scheme, based on the resonant control, is put forward, which can meet the grid codes' reactive current requirement. Both the simulation and experimental results show that the proposed control scheme can accelerate the attenuation of the dc and negative sequence stator fluxes, and thus reduce the fluctuations in the active/reactive power, the electromagnetic torque and the dc link voltage. As a result, a smooth HVRT process can be obtained, which is meaningful to the turbines' safety.