考虑感应电动机故障中电磁转矩变化的节点暂态电压评估方法

暂态电压稳定与负荷动态特性之间关系紧密，而感应电动机负荷特性是引起暂态电压稳定的重要原因。利用极限切除时间来评估负荷节点暂态电压稳定状况已有研究，但相关研究都忽略了故障中感应电动机电磁转矩的变化对极限切除时间的影响。为进一步准确求得极限切除时间，对计及故障中感应电动机电磁转矩的变化的极限切除时间进行了研究，建立了感应电动机电磁转矩的数学模型，求得了极限切除时间。极限切除时间反映了负荷节点暂态电压稳定状况，在综合程序(PSASP)中对EPRI36节点系统进行了仿真和对比，仿真结果验证了所述方法的有效性。

Assessment method of transient voltage stability of load bus considering the changing of induction motor electromagnetic torque in fault

The transient voltage stability has a close relationship with dynamic load characteristic. The load characteristic of induction motor is the important reason causing transient voltage stability. There have been studies on using the critical clearing time to assess transient voltage stability of load node, but the relevant research ignores the effect of the change of the electromagnetic torque of induction motor on the critical clearing time in fault. In order to obtain the critical clearing time accurately, the critical clearing time which considers the change of the electromagnetic torque of induction motor in fault is researched, the mathematical model of electromagnetic torque of induction motor is established, and the critical clearing time is obtained. The critical clearing time reflects transient voltage stability of load node. Simulation and comparison of EPRI36 node system are conducted in power system analysis software (PSASP), and the result verifies the effectiveness of this method.