凸极同步发电机定子绕组内部故障暂态仿真及试验验证

SIMULATION AND EXPERIMENT ON SALIENT-POLE SYNCHRONOUS GENERATOR STATOR WINDING INTERNAL FAULTS

同步发电机定子绕组内部故障分析是一个十分复杂而重要的问题。文中在建立同步发电机定子绕组内部故障暂态计算模型时采用通用支路电压矩阵方程来建立回路电流方程,具有简洁、通用性强的特点。利用多回路理论着重对同步发电机带载时定子绕组内部故障暂态全过程进行了仿真计算,并与试验录波波形进行了对比,结果表明这种仿真方法能够准确地模拟同步发电机故障暂态过程。文中还分析了影响暂态过程仿真精度的因素,认为铁心局部饱和、铁心剩磁、转速变化及回路电阻变化是产生仿真误差的重要原因。

Calculation on salient-pole synchronous generator stator winding internal faults is a very difficult problem. This paper presents the mathematical model of synchronous generator transient simulation which adopts a general branch voltage matrix function to establish circuit current matrix function very conveniently and directly. Based on multi-loop theory, this paper simulates salient-pole synchronous generator stator winding internal fault transients, especially when the synchronous generator is loaded. The results between simulation and field tests is very similar, and which proves that the theory and ways of transient simulation is able to simulate salient-pole synchronous generator stator winding internal faults. This paper also analyzes the causes of transient simulation errors, and recognizes the iron partial saturation, iron residual magnetic, rotation speed change and circuit resistance change cause the errors.