中文摘要：

电网电压骤升故障会造成双馈感应发电机定子绕组中产生定子磁链的暂态直流分量，甚至引起比电网电压跌落更强的双馈发电机定、转子电流和电磁转矩的冲击。首先分析电网电压骤升下双馈发电机转子电流的电磁过渡过程，在变流器转子电流环中引入虚拟电阻控制，虽然能够有效抑制转子电流和电磁转矩的振荡，但是会引起转子电压过高和转子电流振荡过程加长，仅在低频部分具有抑制作用，因此本文引入虚拟电感，形成虚拟阻抗的改进控制策略，缩短了电网电压骤升时的转子振荡过程，并且对高频部分具有较强的抑制作用，提高了系统的高电压穿越性能。仿真和实验结果验证了所提控制策略的有效性和可行性。

英文摘要：

Grid voltage swell will cause transient DC flux component in the doubly fed induction generator （DFIG） stator windings, causing more serious stator and rotor current and torque oscillation even than voltage dip. This paper analyzed the dynamic behavior of DFIG during voltage swell. Based on the above analysis, the virtual resistance control strategy manages effective to suppress the rotor current and torque oscillation, but it can lengthen oscillation transient time of the rotor current during the voltage swell, and can result in higher rotor voltage than the conventional control. This paper proposed a virtual impedance control strategy to enhance its high voltage ride through（HVRT）capability, which can shorten the rotor oscillation process and suppress the high frequency component. Simulation and experimental results verify the effectiveness of the control strategy.