Distribution networks HIF location: A frequency domain system model and WLS parameter estimation approach
Distribution networks HIF location: A frequency domain system model and WLS parameter estimation approach
复制标题
配电网 HIF 定位：频域系统模型和 WLS 参数估计方法
DOI：
10.1016/j.epsr.2017.01.030
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发表时间：
2017
影响因子：
3.9
通讯作者：
L. L. Pfitscher
中科院分区：
文献类型：
--
作者：
M. J. Ramos;A. Bretas;D. Bernardon;L. L. Pfitscher
高阻抗故障定位仍然是保护工程师面临的挑战。本文提出了一种基于系统参数估计的配电网高阻抗故障测距解析公式。该方法基于一个频域系统模型，该模型考虑了由两个反平行二极管和一个电弧电阻组成的高阻抗故障模型。该模型是一个超定的非线性代数方程组，通过加权最小二乘法求解。采用残差分析方法进行估计选择。该方法只使用局部电压和电流作为输入数据，通过建立架空配电线路的精确线段模型来考虑电容效应。验证是通过使用IEEE System 13节点测试馈线、RGE Sul Power Utility(巴西南部)的实际配电系统和从数字继电器记录的实际高阻抗故障进行的数值模拟完成的。将测试结果与最先进的测试结果进行比较，突出了该方法的高精度，表明了实际应用的潜在方面。考虑到完整的HIF模型，总体平均误差为0.3%，考虑到农村支线的真实HIF，总平均误差为1.39%。该配方目前被RGE Sul的保护工程师用作面向可靠性的工具。
High impedance fault location still represents a challenge for protection engineers. In this work, an analytical formulation for high impedance fault location in power distribution systems is presented, based on system parameters estimation. The proposed method is based on a frequency domain system model, developed considering a high impedance fault model composed by two antiparallel diodes and an arc resistance. The proposed model is an overdetermined nonlinear algebraic system of equations in which the solution is obtained through a Weighted Least Square approach. A residual analysis is applied for estimate selection. The proposed method considers the capacitive effect through an exact line segment model for overhead distribution lines, using only local voltages and currents as input data. Validation is done through numerical simulations using the IEEE system 13 buses test feeder, a real distribution system from the RGE Sul Power Utility (Southern Brazil), and a real high impedance fault recorded from a digital relay. Comparative test results with the state-of-the-art highlights the method's high accuracy, indicating potential aspects for real life application. Overall average errors of 0.3% considering a complete HIF model were obtained, and a 1.39% error considering a real HIF in a rural feeder. The formulation is currently used by protection engineers at RGE Sul as a reliability oriented tool.