Cooperative Control Strategy of DFIG Wind Farm for Transient Reactive Power

In order to enhance the LVRT capability of wind farm, the transient reactive power characteristics of wind farms needs to be improved. In this paper, a transient reactive power control strategy of GSC cooperate with multiple reactive power sources in the wind farm is proposed. Firstly, a DFIG wind farm model with SVG reactive power compensation device is established. The influence of SVG transient reactive power characteristics on the reactive voltage characteristics of the wind farm during the voltage fault recovery stage is analyzed, and the SVG transient response time constant is parameterized. Then the cooperative control strategy is carried out. This control strategy improves the transient reactive power response speed of the wind farm, enables the wind farm to quickly retract reactive power during the fault recovery stage, suppresses overvoltage at the wind farm's PCC, and the control strategy is verified by simulation.