面向智能配网的低压直流电路故障诊断与定位分析

Analysis of Fault Detection and Location of Low Voltage Direct Current for Smart Distribution Network

针对配网台区智能化的需求,提出一种低压直流线路故障的诊断与定位方法。首先分析了在智能配网背景下,低压直流配网的形态特征,建立了低压直流配网的故障模型,分析了智能设备在配网故障诊断中的作用。然后讨论了不同类型的接地故障特点,并通过模型说明了故障阻抗在故障电流中的作用。最后针对智能配网台区的用户侧特点,提出了一种配网故障定位的方法,说明了网络不同故障类型下的响应结果。

Aiming at the smart demand of distribution network substations,a method for detecting and locating low-voltage DC network faults is proposed.Firstly,in the context of intelligent distribution network,the morphological characteristics of low-voltage DC distribution network are analyzed,the fault model of low-voltage DC distribution network is established,and the role of intelligent equipment in fault detection of distribution network is analyzed.Then the characteristics of different types of grounding faults are discussed,and the role of fault impedance in fault current is illustrated by a model.Finally,based on the characteristics of the user side in the intelligent distribution network,a method for fault location of the distribution network is proposed,and the simulation results under different types of faults in the network are illustrated.