摘要：随着双馈发电机在风电场装机容量的不断提升，电网电压骤降下的电磁暂态过程研究具有重要意义。本文用电磁场有限元方法研究三相对称电压跌落为零时双馈发电机的运行行为，通过比较故障前后发电机内部磁场的变化规律，分析故障后发电机参数与定转子磁链的变化特征，进而说明故障后发电机电磁冲击产生的根本原因，为双馈发电机电磁设计及低电压穿越的研究提供一定的依据。
关键词：双馈发电机;三相对称电压跌落;发电机参数;电磁冲击

Abstract:  With the continuous growing of doubly fed induction generators used in the wind power plants, it is of great importance to study the generators transient process for abrupt grid voltage sag. Through comparing  generators magnetic field characteristics ahead of the three phase symmetrical short circuit with those after the fault, this paper analyzed generators parameters and magnetic flux between the faults and explained the fundamental reasons for the electromagnetic impulse after the fault happened base on the finite element method.
Key words:  DFIG；three phase symmetrical voltage dip；generator parameter；electromagnetic impulse