中文摘要：

全面分析了双馈型风电机组网侧换流器在正常工作和故障情况下的无功调节能力,提出了相应的网侧换流器无功控制策略来充分利用其无功调节能力以改善风电场的并网能力。采用DigSILENT/Power Factory 14.0,搭建详细的双馈型风电机组模型,并接入等效弱电网。仿真结果验证了提出控制策略的有效性：正常工作情况下,网侧换流器产生的无功功率可以很好地抑制风速变化引起的电压波动;故障情况下,网侧换流器能产生接近自身容量的无功功率,在一定程度上提高故障发生后电压的恢复能力。

英文摘要：

The reactive power regulation capacity of grid-side converter of doubly-fed induction generator in wind farm is analyzed under both normal and faulty operating conditions and the reactive power control strategy for grid-side converter is proposed to fully use its reactive power regulation capacity for improving the grid-connection performance of wind farm.The model of doubly-fed induction generator set for wind farm is built with DigSILENT / Power Factory 14.0 and connected with an equivalent weak grid.Simulative results show the validity of the proposed strategy：the reactive power generated by the grid-side converter can suppress the voltage fluctuation caused by wind speed variation under normal condition and enhance the voltage recovery capability under faulty condition.