风电场并网线路故障跳闸测距分析

Fault Trip Location Analysis of Grid⁃Connected Line in Wind Farm

风电场并网线路单相接地故障特性受风电场并网方式、风机控制策略等影响,传统故障测距的方法测距精度已无法满足要求。本文研究了传统阻抗测距方法的测距误差,并以某330 kV变电站1条110 kV风场线路为例,构建含风电并网的双端输电模型;仿真分析了风电场并网线路的故障电流及阻抗特性,验证了依托于传统电源侧配置的故障测距装置测距结果的误差性。为进一步保证风电场并网线路故障测距精度,在现有研究的基础上提出了一些设想。

The single-phase grounding fault characteristics of wind farm grid-connected lines are affected by gridconnected mode and fan control strategy,and the ranging accuracy of traditional fault location methods can not meet the requirements.This paper firstly theoretically studies the ranging errors of traditional impedance ranging methods,and takes a 110 kV wind farm line in a 330 kV substation as an example to build a two-terminal transmission model including wind power grid-connected lines,simulates and analyzes the fault current and impedance characteristics of wind farm grid-connected lines,and verifies the error of ranging results based on the fault ranging device configured on the traditional power supply side.In order to further ensure the fault location accuracy of grid-connected lines of wind farms,some ideas are put forward based on the existing research.