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。
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 acquisi tion unit collects the fault signals in the distribution network line,and obtains the transient voltage and transient current data of differ ent 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 calcu lates 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 informa tion.The test data indicates that the error of the distribution network fault diagnosis method designed is small..
作者
顾健
郭元萍
李波
GU Jian;GUO Yan-ping;LI Bo(Bijie Power Supply Bureau,Guizhou Power Grid Co.,Ltd.,Bijie,Guizhou 551700,China;Bijie Suburban Power Supply Bureau,Guizhou Power Grid Co.,Ltd.,Bijie,Guizhou 551700,China)
出处
《计算技术与自动化》
2020年第3期27-31,共5页
Computing Technology and Automation
