地铁24脉波整流机组的仿真及谐波电流分析

imulation and harmonic current analysis of 24-pulse rectifier unit in metro

牵引地铁列车的直流电动机广泛使用24脉波整流机组提供的直流电源。分析了24脉波整流机组的工作原理,利用MATLAB-SIMULINK工具箱搭建24脉波整流机组仿真模型;采用傅里叶级数从理论上分析了电网侧和直流侧谐波电流,且通过仿真分析,更加直观地体现了电网侧和直流侧谐波电流特点。结果表明:采用24脉波整流机组,网侧电流谐波含量大大降低,减少了对电网的污染,同时输出直流电压的纹波系数较小,从而体现了地铁直流牵引供电系统中采用24脉波整流机组的优越性。

The DC motor of traction metro train widely use DC power supplied by 24-pulse rectifier unit.The basic working principle of 24-pulse rectifier unit was presented.Taking advantage of SIMULINK tool in MATLAB,a simulation model with 24-pulse rectifier unit was build;harmonic currents of grid side and DC side were analyzed with Fourier series in theory,the characteristics of harmonic current in grid side and DC side was obviously reflected by simulation analysis.The results show that 24-pulse rectifier can substantially reduce the current harmonic.At the same time,the output DC voltage ripple coefficients become smaller.All analysis explains the superiority of 24-pulse rectifier in subway DC traction power supply system.