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中文摘要：
应用Matlab7.0建立了含不同风电机组的风电场动态模型,用于研究包含恒速异步风力发电机和双馈异步风力发电机的风电场对电网的影响,通过仿真分析电网发生严重三相短路故障后不同风电机组的低电压穿越能力,以及加装静止无功补偿器（SVC）后风电机组的低电压穿越能力。比较风电机组转速、有功功率和无功功率变化情况,得出结论：双馈异步风力发电机变速平稳,低电压穿越能力较强,有利于优化电能质量。当电网发生故障时,针对风电场中的不同风电机组应采用不同的策略来提高风电机组的低电压穿越能力,维持电力系统的稳定运行。
英文摘要：
The dynamic model of wind farms with different wind turbines was built with Matlab 7.0 to study the effect of wind farms with fixed speed induction wind turbines and doubly-fed induction wind turbines on the power grid. Simulations were conducted to analyze the low voltage ride-through （LVRT） ability of various wind turbines after oc- currence of serious three-phase faults or installation of SVC in the power grid. Based on analysis of the rotation speed, the active power, and the reactive power changes of the wind turbine, it is concluded that the doubly-fed induction wind turbine which has steady speed variation and strong LVRT ability is beneficial to optimize the power quality. When failures occur in the power grid, different strategies should be applied for different turbines to improve their LVRT to maintain the stability of the power system.
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