一种用于在线电压稳定分析的事故筛选和排序新方法

A new method of contingency screening and ranking for on-line voltage stability analysis

提出一种用于在线电压稳定分析的事故筛选和排序新方法。这种方法利用事故前后节点电压的降落和有功网损上升作为综合指标进行事故筛选,快速地在大量可能的预想事故中选择出少部分可能引起电压失稳的事故。然后采用改进连续潮流法计算准确的有功裕度指标并进行排序,极大地提高了事故扫描速度,并将之用于福建电网的在线电压稳定监控系统,在速度上满足在线运行要求,证明了该方法的优越性。

A new method for contingency screening and ranking for on-line voltage stability analysis was introduced. This method uses node voltage drops after contingency and increase in active net-loss as comprehensive indexes to carry out contingency screening, which may pick out a small group of contingencies that may cause voltage stability problems from the huge setting of possible contingencies. Then improved continuation power flow is used to precisely calculate active margin indexes that are ranked consequently. The whole process greatly enhances the efficiency of contingency screening, and the advantage of this method is justified by the case of on-line voltage stability monitory and control system of Fujian grid, which meets the demand of on-line operation by adopting the proposed method.