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从双馈风电机暂态内电势变化机理的角度出发,计及转子电流动态的影响,精确计算发生三相短路时双馈风电机的定转子磁链,提出改进的双馈风电机短路电流有效值计算方法.基于电子系统实时数字仿真器(RTDS)的含双馈风电机实际控制器的物理实验平台,验证了所提出的短路电流计算方法较忽略转子动态过程的计算方法有更高的精确度.在此基础上,分析双馈风电机短路电流和低电压穿越要求对保护的影响,并提出一种改进的风电场送出线保护方案.“,”Considering the variation mechanism of transient EMF for doubly-fed wind turbines and the influence of dynamic rotor current,the stator and rotor flux of double fed wind turbine with three phase short circuit was calculated accurately,the improved virtual value calculation method of short-circuit current for doubly-fed wind turbine was proposed.It was verified that the proposed short-circuit current calculation method had higher accuracy than the calculation method neglecting rotor dynamic process based on RTDS physical experiment platform with actual controller of doubly-fed wind turbine.According to this,the effect of short circuit current and low voltage ride through on protection requirement was analyzed,an improved protection scheme for wind farms transmission line was put forward.