Optimal Window Function and Its Application in Harmonic Detection of Power Grid [一种优化窗函数及其在电网谐波检测中的应用分析]

作者：Li Z.; Hu T.; Du Y.; Xiang X.; Zhang T.; Li Z.

来源：High Voltage Apparatus, 2020, 56(10): 239-246 and 252.

DOI：10.13296/j.1001?1609.hva.2020.10.037

• Discrete Fourier transform
• Harmonic detection
• Mathematical fitting method
• Six-term minimum sidelobe optimization window
• Spectral interpolation

For the harmonic detection method based on discrete fourier transform(DFT), the existing window per-form low accuracy in measuring the signal with high-order and weak amplitude harmonic component in the situation when the frequency of power grid fluctuate. Therefore, a minimum sidelobe optimization window is proposed and its application in harmonic detection of power grid is analyzed. Firstly, the cosine window function is optimized accord-ing to the constraint condition, a minimum sidelobe window is proposed and the spectrum characteristics of the pro-posed window is analyzed. Then, an improved DFT harmonic detection algorithm based on six-term minimum side-lobe optimization window interpolation is proposed. The calculation formula of harmonic parameters is obtained by applying mathematical fitting method. Furthermore, simulation experiments in complex conditions are carried out to validate the improved performance of the proposed six-term minimum sidelobe optimization The research re-veal that the six-term minimum sidelobe optimization window have smallest peak sidebobe compared with existing window, which can effectively suppress the interaction of spectrum leakage, improve the measurement accuracy of DFT harmonic detection method, and can meet the acquirement of harmonic measurement in complex situations.

• 单位
  三峡大学