陈和洋,郑文迪,吴文宣.采用直流分量恢复法的直流系统谐波分析[J].电测与仪表,2021,58(1):96-103. Chen Heyang,Zheng Wendi,Wu Wenxuan.Harmonic analysis of DC system using DC component recovery method[J].Electrical Measurement & Instrumentation,2021,58(1):96-103.
采用直流分量恢复法的直流系统谐波分析
Harmonic analysis of DC system using DC component recovery method
Most of the harmonics in the DC system exist in the form of superposition on the DC component. In order to achieve accurate analysis of such mixed signals, a DC component recovery method is proposed for harmonic analysis. According to the additivity principle of the windowed Fourier transform, the windowed Fourier transform of the mixed signal does not affect the respective analysis results of the DC component and the harmonic component, therefore, it is not necessary to filter the DC component, the accurate analysis of DC and harmonic components is achieved, as well as retaining the integrity of harmonic signal analysis. By analyzing the influence of windowed Fourier transform on the amplitude of DC component, it is proposed to recover the transformed amplitude by DC component recovery coefficient, and the harmonic component is corrected by double-peak spectral line interpolation to further improve the analysis accuracy. The simulation results verify the effectiveness of the proposed method and the implementation process is simple.
