Installation SVC to improve output active power of large-scale wind farm based on the transient stability

Some three-phase short-circuit fault will cause wind turbine generators tripping due to low grid voltage in order to contain transient stability, furthermore, large-scale wind farms tripping can result in severe system oscillation and aggravate the transient instability. In view of this, a static compensator (SVC) is installed in the grid containing large-scale wind farm. A voltage feed-forward control strategy is proposed to adjust the reactive power of SVC compensation and ensure that the grid voltage is quickly restored to a safe range. The mathematical model of the doubly-fed induction wind generator (DFIG) is proposed. The control strategy of DFIG uses PI control for rotor angular velocity and active power. 4-machine system simulation results show that the SVC reactive power compensation significantly improve output active power of large-scale wind farm satisfying transient stability, reduce the probability of the tripping, and improve the utilization efficiency of wind farms.