The Research Of High Frequency Resonance Analysis And Suppression In The System Composed Of Electric Locomotive And Traction Power System

At present,the harmonic resonance phenomenon occurs frequently in Chinese high-speed railway,which brings great challenges to the safety and efficient operation of high-speed railway.The locomotive running on high-speed railway is mainly AC/DC/AC electric locomotive,the traction transmission structure of which determines that it will inevitably inject low frequency harmonics and high frequency harmonics to the traction network.When the harmonic frequency of electric locomotive poured in the traction power system coincides with the resonance frequency of traction power system,harmonic voltage and harmonic current will be amplified,and then,it will cause resonance accident in high-speed railway.First of all,based on the mathematical model of traction network,MATLAB simulation model of traction power system with full parallel AT mode is built.Secondly,based on the transient current control method and carrier phase shifted pulse width modulation technology,the MATLAB simulation model of traction drive system of CRH5 is established.Then,co-simulation model of trainset and traction power system is established and verified on the basis of two separate models.Based on the trainset-traction power system co-simulation model,the control variable method is used to analyze the resonance characteristics of the trainset-traction power system co-simulation system.In this paper,the SHEPWM modulation method is introduced into the modulation module of the traction rectifier of trainset,and the harmonics near the resonance frequency of the trainset are suppressed.The Simulink model of Selective Harmonic Elimination Pulse Width Modulation module is built,which used in the trainset-traction power system co-simulation model to verified that SHEPWM module has better resonance suppression characteristics than CSBSPWM module.