基于小波分析的电能质量三相不平衡度虚拟仪

摘要

This paper introduces the technology of power quality three-phase unbalance detection based on wavelet analysis. The stable signals are obtained by removing the disturbed points from the original signals, which have been detected by using wavelet analysis on the virtual instrument design platform of Lab VIEW. The three-phase unbalance of the fundamental component can be calculated after the harmonic is filtered by making use of Butterworth lowpass filter. The experimental results indicate that the method using wavelet can eliminate the disturbance of signal efficiently and obtain the high precision.%介绍了一种基于小波分析的电能质量三相不平衡度检测技术,在LabVIEW虚拟仪器设计平台上采用小波分析技术检测电能信号的突变点,从原始信号中除去突变点得到稳态信号,采用巴特沃斯低通滤波器滤除谐波成份后计算工频基波的三相不平衡度.实验结果表明,利用该方法可以很好地去除信号突变,获得较高的精度.