采用小波变换的有效值和频率测量方法

A Method of RMS and Frequency Measurement Using the Wavelet Transform

讨论了对含谐波的正弦电压(电流)采样值直接进行小波变换计算基波、谐波电压(电流)的有效值及频率的方法。频率测量中,应用数字测频法对极值点法进行改进。利用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。仿真结果表明,在理想采样的情况下(采样过程不存在同步误差),利用小波变换的方法可以对有效值和频率进行准确的测量。

It＇s discussed that the method of RMS and frequency measurements directly from the wavelet transform data associated with each sampling sine voltage （current） element pair containing harmonic. Digital frequency measurement algorithm is applied to improve maximum value points in frequency measurement. A good result by analyzing a short - time signal using wavelet transform algorithm have got. Computer simulation result proves that RMS and frequency measurements using the wavelet transform can get the accurate result by the ideal sampiing situation,i, e. the synchronous error is zero.