大型凸极同步发电机定子绕组内部故障瞬态仿真

大型凸极同步发电机定子绕组内部故障的仿真计算对保护的配置具有重要意义。文中以多回路理论为依据，建立了大型凸极同步发电机定子绕组内部故障瞬态分析的数学模型；以匝间短路为例，给出了系数变化矩阵。通过在动模机上进行故障的动态模拟实验，验证了该方法的正确性。最后对三峡电站SF700－80／19720大型水轮发电机定子绕组一支路发生匝间短路的故障情况，进行了瞬态过程的仿真计算，验证了所配置单元件横差保护的灵敏度，结果令人满意。

TRANSIENT SIMULATION OF LARGE SALIENT-POLE SYNCHRONOUS GENERATORS UNDER STATOR WINDING FAULTS

Based on the Multi-loop Method, this paper describes a mathematical model of large salient-pole synchronous generators to analyze the transient behavior of internal faults in stator windings. The associated matrices of the loops are introduced to reduce the total number of the loop equations. As an example, the coefficient matrix of the turn-to-turn fault is given. The method was verified by comparison with results obtained from the experiment on the analog salient-pole synchronous generator in the Tsinghua University motor lab. The transient-state behaviors of SF700-80/19720 hydro-generator of the Three Gorge Station under the turn-to-turn winding faults are simulated and the proposed protection configuration is tested.