根据国家电网公司风电机组不间断运行标准中关于低电压穿越的要求，分析了电网不对称故障情况下对双馈式风电机组的影响，建立了双馈式感应电机的数学模型。依据所建立的数学模型，设计了转子侧Crowbar电路和直流侧Chopper电路相结合的穿越方案，并对其控制策略进行了分析和试验研究，验证了电路的正确性和合理性。

According to the requirements for the low voltage ride through(LVRT) in the standard of State Grid Corporation for uninterrupted operation of wind turbine unit, the effects of asymmetrical grid fault on the double-fed wind turbine unit are analyzed, and a mathematical model for the doublefed induction generator is established. Based on the mathematical model, the through plan by combing the rotor Crowbar circuit and DC Chopper circuit is designed and the corresponding control strategies are analyzed. Finally, the correctness and the feasibility of the circuit are verified.