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中文摘要：
为保持系统稳定,必须要求风电机组具有故障穿越能力。双馈风电机组故障穿越能力已成为研究热点。介绍了故障穿越标准,分析了双馈风电机组暂态特性与制动电阻的工作原理,详细分析电网电压跌落情况下,制动电阻接在风电场升压变压器低压侧与接在风电机组机端对双馈风机故障穿越能力影响。试验结果表明：故障期间投入制动电阻,能有效提升双馈风电场故障穿越能力。
英文摘要：
In order to improve the stability of power system,the capability of fault ride-through（FRT） is required for the large wind farms.The research on fault ride-through of doubly-fed induction generator（DFIG） has become a hot issue.The standards of fault ride-through are introduced,and then the transient characteristics of doubly-fed induction generator and the working principle of brake resistance are analyzed.The effects of brake resistance placed at the low side of the transformer of wind farm or the terminal of DFIG on fault ride-through of doubly-fed induction generators are analyzed in detail when there is a voltage dip in grid side.The test results show that the brake resistance can substantially improve the performance of low voltage ride-through（LVRT） of a DFIG wind farm when placing it at the low side of transformer of the wind farm.
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