综合考虑负荷增长和多预想故障的静态电压失稳预防控制策略

A preventive control strategy to avoid static voltage collapse considering both load-increasing and multi-contingency

提出的综合的静态电压失稳预防控制策略以最小控制代价为目标,综合考虑了负荷增长方式和多预想故障条件下的静态电压稳定裕度约束对系统静态电压稳定性的影响。该策略分2步进行:首先考虑负荷增长的影响,若系统在未来运行点不满足静稳指标,则找出系统的薄弱区域和负荷最安全变化方向,在此方向进行合理的无功补偿;其次考虑多预想故障条件下系统的静态电压稳定裕度约束,并引入关键故障集的概念求解计算优化策略,施加控制措施后再进行扫描确定新的关键故障集,循环直至对所有故障都满足裕度要求。IEEE-39节点算例证明了该综合预防控制策略的有效性。

A preventive control strategy to avoid static voltage collapse considering both load-increasing and multi-contingency was presented. This strategy was realized by two steps. The first step is to consider the influence of load increasing. If the static voltage stability margin of future operating point is not satisfied, one could calculate out the weakest region and safest direction of the load increase, and compensate proper reactive powers in this region to drive the system changed under this direction. The second step is to consider the restriction of system static voltage stability margin under multi-contingency. A key sub-set of contingencies was determined to solve the problem to get an optimal control strategy, which was then applied to power grid to obtain a new operation point. The procedure restart until static voltage stability margin for each contingency is satisfied. The validity of the proposed model and the efficiency of relevant algorithm are tested in the IEEE-39 bus system.