电气化铁道牵引供电系统加窗插值法的谐波分析

传统电气化铁道牵引供电系统的谐波分析方法受频谱泄漏和栅栏效应的影响,不能准确地得到谐波相关参数。为此,提出一种采用加六项优化余弦组合自卷积窗和四谱线插值结合的新算法对谐波进行分析。首先采用复调制细化法分析信号中基波频率附近的谐波成份,剩余信号加窗处理,利用离散傅里叶变换找出谐波频点附近相应离散频谱的4根峰值谱线,利用插值算法对电气化铁道牵引供电系统中谐波相关参数频率、幅值及相位进行加权修正并推导出计算公式,从而进一步提高分析结果的准确性。

Harmonic Analysis of Adding Window Interpolation Method in Electrified Railway Traction Power Supply System

The traditional harmonic analysis method is influenced by frequency spectrum leakage and fails to obtain accurately the harmonic related parameters in the electrified railway traction power supply system. This paper proposes an approach for power network harmonic analysis with six optimization cosine combined self-convolution window and four-spectrum-line interpolation. The algorithm is firstly employed to analyze the harmonic components near the fundamental wave frequency with zoom fourier transform,the residual signals are processed with window and the discrete fourier transform is used to find out the corresponding four peak spectral lines of the discrete frequency spectrum near the harmonic frequency.The frequency of the related parameters of the power network harmonic,the amplitude and phase are weighted and corrected by means of interpolation algorithm to deduce calculation formula so as to improve the accuracy of analysis results.