高速铁路牵引供电系统谐波谐振抑制方案研究

摘要

由于牵引供电系统对谐振频率附近的谐波有放大作用,且输入系统的谐波与系统谐振频率越近,系统对谐波的放大作用越大.若通过合理优化牵引供电系统结构,使系统谐振频率避开输入系统的谐波频率范围,则能有效抑制谐波谐振,进而达到降低系统谐波含有率的目的.基于该思路,本文建立了牵引供电系统数学模型,利用模态分析理论研究牵引供电系统主要组成元件的谐振灵敏度,并通过实例计算,证明优化牵引供电系统结构后,牵引供电系统谐波含有率明显降低,可达到抑制系统谐波含有率的目的.%The traction power supply system amplifies the harmonic in the vicinity of the resonance frequency.Therefore,with the harmonic frequency approaching the system resonant frequency,the amplification of the system improves accordingly.If the structure of the traction power supply system is optimized reasonably,the harmonic frequency of the system can be set out of the range of the input system.By so doing the harmonic resonance can be effectively suppressed,thus reducing the harmonic percentaeges of the system.The mathematical model of traction power supply system is established based on this idea.Then resonance sensitivity,tested from the main components of the traction power supply system,is studied through modal analysis theory.Through examples,this paper prove that harmonic ratio in traction power supply system decrease significantly after the optimization of the power supply system structure,which achieve the purpose of suppressing system harmonic.