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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。
The sudden short circuit of AC variable frequency AC generator is a common fault condition, and its transient process deserves to be further studied. Aiming at the double-stator winding asynchronous generator (DWIG) used in the AC variable frequency power generation system of aviation, the simultaneous and symmetrical sudden short circuit of the two sets of windings was analyzed. The decay law of short circuit current, the formula of the maximum short circuit current Arrival time. The results show that DWIG will produce two direct current (DC) decay components and one rotating decay component in the short-circuit, corresponding to the influence of two sets of stator windings and rotors respectively. The super-transient reactance is similar and inversely proportional to the peak value of the transient current. The analysis shows that the peak value of the short-circuit current of the DWIG is smaller than that of the synchronous generator. The obtained results can help to understand the transient characteristics of DWIG. The analytical formulas obtained are helpful to estimate the sudden short circuit current of generators and assist the electromagnetic design of generators, and can provide theory for the design of power generation system protection unit and controller reference.