In aircraft variable frequency AC power system,short circuit is a common fault worthy of in-depth study.In this paper,the transient performance of the dual stator-winding induction generator (DWlG) is analyzed under the condition when short circuit simultaneously occurs in both control winding and power winding.The analytical solution is used to derive the short circuit attenuation rules,the maximum current expression and the corresponding arrival time.The result shows that there are two DC decaying components and one AC decaying components when short circuit occurs,corresponding to the two set of stator-windings and rotor winding respectively.The transient reactance of the DWlG is similar to the d-axis sub-transi ent reactance of the synchronous machine,and is inversely proportional to the transient current peak value.Analysis shows that the DWlG transient current is smaller than the synchronous machine.The conclusion of the paper can help with estima ting DWiG's transient current,guiding electromagnetic design of the generator,and providing theoretical reference to the design of the protection unit and controller of the power generation system.%航空变频交流电源发电机突然短路是一种常见的故障情况,其瞬变过程值得展开深入研究.针对用于航空变频交流发电系统的双定子绕组异步发电机(DWIG),分析了两套绕组同时发生对称突然短路的情况,运用解析法给出了短路电流的衰减规律,最大短路电流计算公式及到达时刻.研究结果表明,DWIG在短路时定子绕组中将产生两个直流衰减分量和一个旋转衰减分量,分别对应两套定子绕组和转子的影响,其瞬态电抗的形式与带阻尼绕组的同步电机直轴超瞬变电抗类似,并与瞬态电流的峰值成反比关系,分析表明DWIG短路电流的峰值小于同步发电机.所得的结果能够有助于深入理解DWIG的瞬态特性,获得的解析公式有助于对发电机突然短路电流进行估算,辅助发电机电磁设计,可以为发电系统保护单元和控制器的设计提供理论参考.
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