基于故障距离分布函数的配电网故障定位  

Fault Location for Distribution Network Based on Fault Distance Distribution Function

作　　者：谭丹[1] 杨洪耕[1] 曲广龙[1] 

机构地区：[1]四川大学电气信息学院,四川省成都市610065

出　　处：《电网技术》2012年第10期119-124,共6页Power System Technology

基　　金：国家自然科学基金资助项目(51077095)~~

摘　　要：为提高配电网故障定位精度,提出了基于母线电压暂降特征信息和故障距离分布函数实现配电网故障定位的单点定位算法。由节点阻抗矩阵建立反映故障距离变化的故障距离分布函数,根据故障距离分布函数和故障后变电站端测量到的电压暂降数据计算故障距离,通过数据匹配和逐步逼近搜索法确定过渡电阻值,引入了排序算法对所有可能故障点进行排序,减弱了伪故障点对故障定位结果的影响。该方法也适用于三相不平衡配网,不需多次短路计算迭代。算例结果验证了该方法的有效性。Based on bus voltage sag characteristics and fault distance distribution function,a single terminal fault location algorithm for distribution network was proposed to improve the accuracy of fault location.The fault distance distribution function was established by nodal impedance matrix that reflected the variation of fault distance,and according to fault distance distribution function and the post-fault voltage sag data measured at the terminal located in substation the fault distance was calculated,and through data matching and stepwise approximation the transition resistance was determined and a sorting algorithm was led in to sort all possible fault points,thus the affect of pseudo-fault points on fault location result could be reduced.The proposed method was suitable for fault location of three-phase unbalanced distribution network and the iteration of short-circuit calculation was not needed.Simulation results of a neutral point unearthed distribution network showed that the proposed method was effective.

关 键 词：配电网 故障定位 电压暂降 故障距离分布函数 排序 

分 类 号：TM727[电气工程—电力系统及自动化]