Development of Wide-frequency Measurement Device based on Blackman Window ApFFT and Double-spectrum-line Correction
In order to further analyze the influence brought by the increasingly obvious characteristics of power network electronization,the monitoring of power network operation condition extends to the direction of interharmonics and higher harmonics,and puts forward higher requirements for synchronous wide-frequency measurement. The windowed interpolation spectrum analysis method widely used in synchronous wide-frequency measurement has spectrum leakage,which will lead to large errors when the fundamental frequency is shifted or there are neighboring signals in the signal.To solve this problem,an improved wide-frequency phasor measurement method based on Blackman window all-phase FFT bispectrum line correction is proposed in this paper.The spectrum of wide-frequency signals is analyzed by combining all-phase FFT and Blackman cosine window,and the parameters are corrected by using bimodal spectral lines. This method can effectively improve the suppression effect of spectrum leakage,reduce the interference of adjacent spectrum,and improve the measurement accuracy of wide-frequency signal parameters in complex operating conditions of fundamental wave frequency offset or adjacent spectrum.
wide-frequency measurementall-phaseblackman windowbispectral line correction
万方数据
维普
