基于最小暂降幅值搜索的电网电压监测点优化配置分析

Optimal configuration of network voltage monitoring points based on the minimum temporary drop value

为了进一步消除电压暂降时的监测盲区,建立了一种基于最小暂降幅值搜索的电网电压监测点优化配置方法。得到不同故障条件下的电压暂降幅值对应的故障位置之间的函数关系,再对所有节点暂降幅值进行黄金分割法搜索获得故障位置信息。研究结果表明:该方法可以利用更少监测点来完成对所有位置故障的监测功能,显著消除了各个监测盲区。当凹陷域扩大后,监测点的数量相对于其它方法都发生了减小,表现出更好适应性。采用该方法相对于文献方法消耗的时间降低了近80%,实现计算效率的显著提升。当电压阈值减小后,配置方案将会产生更大的监测信息冗余度。通过设置最佳的监测冗余度可以确保精确获得电压暂降特征以及完成对故障点的快速定位,不同节点能够承受的电压暂降程度及其负荷变化规律,对各监测点进行合理优化。

In order to further eliminate the blind spot of voltage sag monitoring, an optimal configuration method of grid voltage monitoring points based on the search of minimum temporary drop value is established. The functional relationship between the voltage drop values corresponding to the fault locations under different fault conditions is obtained, and then the golden section method is used to search the voltage drop values of all nodes to obtain the fault location information.The research results show that the method can use fewer monitoring points to complete the fault monitoring function at all locations, and significantly eliminate the monitoring blind areas.When the sag area is expanded, the number of monitoring points in this paper decreases compared with other methods, showing better adaptability. Compared with the method in literature, the time consumed by this method is reduced by nearly 80%, and the computational efficiency is significantly improved. When the voltage threshold decreases, the configuration scheme will produce greater monitoring information redundancy. By setting the optimal monitoring redundancy, the characteristics of voltage sag can be accurately obtained and the quick location of fault points can be completed. The voltage sag degree that different nodes can bear and its load variation rule can be reasonably optimized for each monitoring point.