基于MATLAB的小电流接地系统K(1)故障信息提取与仿真

为了提取两类小电流接地系统K(1)(即单相接地)故障时电力参数信息,本文运用MATLAB电力专业模块库SimPowerSystems构建了具有三条线路的35 kV配电网的仿真模型,通过设置线路长度为8、12、15 km,并选择故障时刻为0.045 s时进行实验.最终取得两类小电流接地系统分别在故障距离为线路2的3 km和6 km处的电流幅值和相位值.与以往单纯以观测故障波形为主的各种电力系统故障仿真不同,文中所提取的故障信息为电力参数的实时量化值,其所携带的故障特征可直接为这类故障的定位提供有利帮助.

The Information Extraction and Simulation of the Little Current Grounding System with the K(1) Fault Based On MATLAB

In order to extract the power parameters information of two types of little current grounding system K(1) (single-phase) fault,a simulation model of 35 kV distribution system with three lines has been established by using MATLAB SimPowerSystems tool.By setting the line length in 8,12,15 km and selecting fault time in 0.045 s,the experiment eventually get the current amplitude and phase values of line 2 which fault distance is 3km and 6km in two types of little current grounding system.Deferent from those power system fault simulation based on simple observation of the fault waveform,the fault information in this article is the real quantization values of the power parameters.The fault characteristics carried by these fault information can provide a favorable help for the location of such fault.