智能电器电参量测量的采样不同步误差的研究

Research on nonsynchronous sample error on parameters measurement of intelligent electrical apparatus

针对智能电器电参量测量存在采样不同步误差的现状,提出一种基于自适应窗长傅立叶变换的电参量测量新方法。该方法通过计算待测电信号的相关系数自适应地确定傅立叶变换的窗长,从而实现无频谱泄漏的傅立叶变换,即实现了电参量参数的精确测量。通过与全波傅氏算法仿真分析对比表明:该方法对于存在谐波、间谐波信号以及基波频率偏移的电参量均能实现高精度的测量,且具有强抗噪声性能。该方法简单、有效且易于智能电器工程实现。

A novel method on parameters measurement of intelligent electrical apparatus based on adaptive window width DFT （AWDFT） is proposed in this paper with the research on nonsynchronous sample error. Firstly, the window width is calculated by calculating correlation of electrical signals to be measured. Then the AWDFT is independent on spectral leakage and high accurate measurement can be realized. It is revealed that parameters are detected accurately in harmonics, interharmonics, noise and frequency fluctuations by simulation analysis with full wave Fourier algorithm. This methods is simple and easy to be applied in engineering.