A novel algorithm for fault location in a distribution network is proposed. The entire grid is divided into several parts according to numbers of power supplies. By rapid identification of the network topology based on graph theory, the connected nodes in a same power supply zone are linked to a tree. The fault-tree is identified in first rough location when a fault happens. According to the node linkage of the fault-tree, the branches that contain fault information are selected for the second round of location process. The data inconsistency between the neighbor nodes of the branches is used to locate the fault accurately. The test result proves the correctness and efficiency of proposed algorithm.%提出一种配电网故障定位的新算法,将配电网根据电源的个数进行分区,基于图论快速识别电网拓扑,将同一电源供电区域内的节点以树的形式进行链接.通过一次粗略定位找到存在故障的树,根据树中节点之间的链接关系,仅选择包含故障信息的支路,利用支路中父子节点故障信息的不一致性完成二次定位,准确找到故障的发生区段.用算例验证了所提算法的正确性和高效性.
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