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

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.