暂态稳定在线预警故障集的自适应筛选

On-line Adaptive Contingency Screening for Early-warning of Transient Stability

大电网暂态安全稳定在线预警的故障数目大、计算负担重,为减少每轮在线预警中需要进行时域仿真计算的故障集数目,并且不遗漏暂态安全稳定的关键故障,提出了暂态安全稳定在线预警预想故障集的一种自适应筛选方法。首先依据上一时间断面上各预想故障的稳定裕度和稳定模式,识别那些影响系统稳定性的关键电网元件;再根据当前这些元件运行状态的变化,确定筛选预想故障的新门槛值;最后将本轮预想故障的预估裕度与该门槛值比较,筛选出那些需要重新计算稳定裕度的故障。通过电网在线预警系统的实际工程运行,验证了该方法的有效性和工程实用性。

The total number of contingencies needed by early-warning of transient stability is huge. In order to reduce the computation burden in every analysis cycle,an adaptive contingency screening method,which is designed to filter out slight cases as much as possible and keep all the severe ones for further detailed assessment,is presented. Based on the stability margins and dynamics modes of contingencies resulting from the last assessment cycle,the critical cases to system stability are firstly identified by us...