基于故障允通能量的低压直流配电网故障定位方法

Fault Location Method for Low-voltage DC Distribution Network Based on Fault Letthrough Energy

为提高低压直流配电网故障检测及故障定位的精度,提出一种新的基于故障允通能量的直流配电网故障定位策略。首先,构建了描述直流故障暂态过程中故障能量的数学模型,用于分析远程变流器对故障定位精度的影响。其次,利用本地电压和电流以及计算的暂态故障允通能量,实现对故障位置的初步预测。最后,通过搭建低压直流测试网络进行了实验验证。实验结果表明,所提方法能够有效降低噪声影响且不受低压直流馈线换流器的电压和电流影响。

To improve the accuracy of fault detection and fault location in low-voltage DC distribution network,a novel fault location strategy for DC distribution network based on fault let-through energy is proposed.First,a mathematical model is constructed to describe the fault energy in the transient process of a DC fault,which is used to analyze the in⁃fluence of a remote converter on the fault location accuracy.Second,a preliminary prediction of the fault location is achieved using the local voltage and current as well as the calculated transient fault let-through energy.Finally,experi⁃mental verification was carried out by building a low-voltage DC test network.Experimental results show that the pro⁃posed method can effectively reduce the impact of noise,and it is not affected by the voltage or current of a low-voltage DC feeder converter.