基于DSP和LabVIEW的电参数检测系统

摘要

To address power quality problems caused by a large number of non -linear load and the electrical equipment, this paper designs an electrical parameter measurement system based on DSP and LabVIEW. It puts forward a FFT (Fast Fourier Transform) and WT (Wavelet Transform) new detecting algorithm. This algorithm at first denoises by using wavelet transform, then finds out the maxima of the high -frequency coefficients of wavelet transform, and then calculates the duration and amplitude of the transient signal. Then it expands the transient signals time interval with the normal signal cycle. At last it makes the whole time FFT analysis, getting the harmonic amplitude, phase and frequency results. Tests show that the detection is of accuracy and feasibility.%为解决大量非线性负荷和冲击性电力设备投入引起的电能质量问题,设计了一套基于DSP和LabVIEW的电参数检测系统,提出了将FFT(Fast Fourier Transform)和WT( Wavelet Transform)相结合的稳暂态检测新算法.该算法先通过小波变换消噪,然后找到小波变换高频系数的极大值点,继而确定暂态信号的持续时间及扰动幅值.然后利用正常信号周期拓展覆盖暂态信号作用的时间区间,最后对整个时间段FFTI分析,得到各次谐波幅值、相位、频率结果.试验结果表明,该检测方案的准确性和可行性符合要求.