能量变换器内部故障仿真

Simulation of Internal Faults in Powerformer

文中用直接相量法建立了能量变换器定子绕组内部故障分析的数学模型。该模型不仅可以对能量变换器中性点经高阻接地和经消弧线圈接地情况进行仿真,还能对绕组内部不同位置处发生的故障进行仿真。以一台能量变换器样机为模型,仿真了定子内部发生单相接地、两相接地故障情况,并给出了故障电流波形。与同容量的常规发电机相比,能量变换器的故障电流较小。

In this paper mathematical models for simulating internal faults in powerformer, using direct phasor method, are described. Internal faults are simulated when the generator neutral point is either high resistance grounding or arc-suppression coil grounding. Simulations are also performed when a internal fault occurred at different locations along the winding. Simulation models during single phase-to-ground fault and two phase-to-ground fault are established by a powerformer prototype, and results about the fault currents are given. The fault current （p.u.） of powerformer is much smaller than th.e same capacity conventional generator.