ISSN 1000-1026
CN 32-1180/TP
  • ISSN 1000-1026
  • CN 32-1180/TP

Citation: lijianfei,chenlongdao.Improved Interpolation Algorithm Applied to Power Harmonic Analysis[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20180722002 copy

Improved Interpolation Algorithm Applied to Power Harmonic Analysis

  • Received Date: July 22, 2018
    Accepted Date: November 10, 2018
    Available Online: 2019-03-14

  • Abstract:

        The Spectral leakage is the main cause of measurement error in windowed interpolation Fourier transform algorithm, the high-order window was used for restraining it, however, it is still hard for improving the estimation accuracy of the second harmonic and other weak harmonics significantly, moreover, it not only cause the loss of frequency resolution,but also complicate the spectral expressions. An improved interpolation estimation algorithm is proposed to solve these issue. By using a low-order sine window, the traditional DFT transform was shifted by 1/2 line spacing to the Odd-DFT domain for revising by the interpolated algorithm. The relative frequency offset?of harmonics was?used to subtract the sum of the long-range spectral leakage interference of other components, and then the interpolated algorithm is performed to obtain the more accurate relative frequency offset. Loop iteration several times to restrain the impact of spectral leakage on estimation accuracy. The correction formula is deduced, the algorithm flow is given, and the simulation analysis is carried out under different environments to obtain a reasonable number of iterations.The analysis results show that the measurement accuracy of this algorithm is higher than those with traditional windowing algorithm,and the accuracy of weak harmonics is even more significantly improved, the required sampling time window is decreasing as well,which improves the measurement accuracy and meets the requirement of power grid.

  • Keywords:

    Low-order window; Interpolation ; Long range spectrum leakage ; Iteration ; Harmonic measurement

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