故障信息的小波分析及其在虚拟仪器中的实现

摘要

Since the signal acquisition process is often affected by various noises,it is necessary to de-noising before the measured data is analyzed.There are all kinds of conventional wavelet functions and wavelet packet with high precision in MATLAB' s wavelet toolbox,which is capable to complete Wavelet analysis by flexible programming.Unfortunately,MATLAB is poor in manmachine interface and data acquisition,although it has the advantages of Lab-VIEW.In order to combine these advantages,this paper presents a wavelet transform analysis method based on Lab VIEW,and it is implicated to the transmission line fault information identification which is proved by ATP simulation.Experimental results show that it could achieve a smooth implementation of wavelet transform by using MATLAB and LabVIEW.%在对信号进行采集的过程中,经常会受到各种噪声信号的干扰和影响,因此在对测量的数据进行分析之前,必须进行信号消噪.MATLAB的小波工具箱中包含了多种常用的小波函数及精度更高的小波包,可以通过简洁、灵活的编程实现小波分析,但MATLAB的缺点是人机交互界面和数据采集功能差,而这恰是Lab VIEW的优点.综合了二者的优点,介绍了一种基于Lab VIEW的小波变换的分析方法,并把其应用到输电线路故障信息的识别中,通过ATP仿真算例进行了验证.实验结果表明:用MATLAB和LabVIEW可以顺利地实现小波变换,效果理想,且界面良好,为进一步的故障定位提供了有力的依据.