暂态电压稳定的模型要求和快速判断

用时域仿真重现了感应电动机负荷引起的电压暂态失稳现象。从保证足够精度并尽量加快仿真暂态电压稳定过程的角度讨论了发电机、电动机负荷以及励磁控制系统的模型选择问题，证明随着故障切除时间的增大，大型电力系统从稳定变为功角失稳的中间可能存在故障切除时间的一个区间，后者对应于功角稳定但电压却失稳。该文改进了作者以前提出的一个感应电动机负荷电压暂态失稳的判据，以便尽早地停止积分过程，其正确性在华中系统、新英格兰系统和浙江系统中得到了验证。

MODELING REQUIRFMFNTS AND FAST JUDGMENT OF TRANSIENT VOLTAGE STABILITY

The modeling requirements for transient voltage stability are discussed from both accuracy and computational speed viewpoints in this paper.Transient voltage instability caused by induction motors.but without losing angle stability. is discovered numerically too.It has beenrevealed that there may be a region of fault clcaring time. which corresponds to angle stabilityand voltage instability. between the global stable region and angle instability region. A stopcriterion proposed previously by the authors is largely improved in this paper.