基于Dijkstra算法的混联配电网故障区段定位方法

A Fault Section Location Method of Hybrid Distribution Network Based on Dijkstra Algorithm

由于现有方法对数学工具过度利用而忽略了故障的具体特征,造成选线与定位不精准而存在偏差的问题,提出一种基于Dijkstra算法的对于混联配电网故障区段定位方法。对混联配电网进行分析研究,总结出发生相间短路、单相接地故障时配电网表现出的特征,随后以可能导致该故障的某一元件位置为起始点,通过Dijkstra算法进行搜索,为更准确获得下一搜索的节点位置,引入代价函数将算法的均等式优先搜索转化为启发式路径搜索,搜索终点所在线路分支即为发生故障区段。在仿真实验条件下,构建小电流接地系统模型,采用所提方法完成模型的故障区段定位,最大定位误差为0.08 km,最小定位误差为0 km,定位结果与真实情况一致,证明了所提方法具有一定的可行性和准确性。

Because the existing method overuses the transition of mathematical tools and ignores the specific characteristics of the fault,resulting in the inaccuracy of the line selection and location,this paper proposes the design of a fault section location method for hybrid distribution network based on Dijkstra algorithm.Based on an analysis of the hybrid distribution network,the paper summarizes the characteristics of the distribution network in the event of phase-to-phase short circuit and single-phase to ground fault,and then takes the location of a component that may cause the fault as the starting point to search through Dijkstra algorithm,so as to obtain the next search node location more accurately.The cost function is introduced to transform the average equality first search into heuristic path search,and the line branch where the search ends is located is the fault section.Under the simulation experimental conditions,the small current grounding system model is constructed,and the fault section location of the model is completed by the proposed method.The resultant maximum error is 0.08 km while the minimum error is 0 km.The location results are consistent with the real situation,which proves that the proposed method has certain feasibility and accuracy.