结合FTU实现配电网故障诊断的行波定位方法

顾健1?覮; 郭元萍1; 李波2

结合FTU实现配电网故障诊断的行波定位方法

引用本文：顾健1?覮，郭元萍1，李波2.结合FTU实现配电网故障诊断的行波定位方法[J].计算技术与自动化,2020,(3):27-31

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作者	单位
顾健1?覮，郭元萍1，李波2	（1. 贵州电网有限责任公司毕节供电局，贵州毕节 551700； 2. 贵州电网有限责任公司毕节市郊供电局，贵州毕节 551700）

中文摘要:针对电力配电网系统的故障情况，提出了FTU采集单元与行波定位法相结合的配电网接地故障定位诊断方法。通过FTU采集单元对配电网线路中的故障信号进行采集，实时获取配电网系统中的不同监测节点的暂态电压和暂态电流数据，并通过A/D转换单元将采集到的原始故障波电压、电流模拟信号转换成数字信号，计算机处理系统利用行波定位方法对接收到的数字信号进行分析计算，利用EMD算法分析出信号中的模态混叠现象和端点效应，采用VMD算法对获取的故障信号分解，通过该方法大大减少配电网故障信号中的伪分量，有效地去除信号噪音，再利用行波定位公式计算配电网故障位置，得出故障信息。实验数据表示，设计的配电网故障诊断方法误差较小。

中文关键词:电力配电网系统 FTU采集单元 A/D转换单元 EMD算法 VMD算法

Traveling Wave Positioning Method for Fault Diagnosis of Distribution Network Based on FTU

Abstract:Aiming at the fault condition of the power distribution network system，a fault diagnosis method for the grounding fault of the distribution network based on the FTU acquisition unit and the traveling wave positioning method is proposed. The FTU acquisition unit collects the fault signals in the distribution network line，and obtains the transient voltage and transient current data of different monitoring nodes in the distribution network system in real time，and collects the original faults through the A/D conversion unit. The wave voltage and current analog signals are converted into digital signals，and the computer processing system analyzes and calculates the received digital signals by using the traveling wave positioning method. The EMD algorithm is used to analyze the modal aliasing phenomenon and the endpoint effect in the signal. The VMD algorithm is used to decompose the acquired fault signal. This method greatly reduces the pseudo component in the fault signal of the distribution network，effectively removes the signal noise，and reuses it. The traveling wave positioning formula calculates the fault location of the distribution network and obtains the fault information. The test data indicates that the error of the distribution network fault diagnosis method designed is small.

keywords:power distribution network system FTU acquisition unit A/D conversion unit EMD algorithm VMD algorithm

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