采用小波变换的功率测量方法

根据国家电能质量标准和国际相关标准对电能质量的要求 ,提出了一种基于小波变换的非正弦波电流 (电压 )有效值和功率的计算方法。此方法利用子带滤波器对非正弦信号进行多分辨率分解 ,得到各个不同频带的小波分解系数 ,在小波域上用小波系数计算基波、谐波电流 (电压 )的有效值及功率 ;同时利用快速小波变换算法对短时间信号进行分析 ,得到了很好的测量结果 ,为工程实践中快速、精确地测定电网的功率参数提供了一种有效的方法。

A Method of Power Measurement Using Wavelet Transform

According to request of national and international standards for power quality, the paper provides a new method based on wavelet transform of RMS and power measurements of nonsine wave current (voltage). In multiresolution analysis, wavelet subband filter is used as decomposing nonsine wave signals and getting wavelet coefficients in different frequency band component. The RMS and power will be calculated using wavelet coefficients. Furthermore, we have got a good result by analyzing a short-time signal using fast wavelet transform algorithm, which gives an effective approach for the fast and precise measurement of power in engineer application.