Measurement and suppression technology of induced voltage generated by traction system in rail transit applications
This paper focuses on mitigating inductive interference caused by the traction systems of rail transit trains on track cir-cuits.The initial analysis explored the interference mechanisms through inductive coupling.Based on the real layout and wiring of DC traction systems in metro applications,a 1∶1-scale induced voltage testing platform for traction systems was built,as the first of its kind in domestic laboratories.This platform was employed to simulate transient inductive interference generated by train traction systems at the receiving end of track circuits under static laboratory conditions.These simulations revealed the induced voltage levels produced by different interfering components and coupling loops on track circuits,under different operating conditions of the traction systems and var-ious relative positions of the track circuits.Moreover,the coupling circuit formed by the DC chopper and braking resistor during resis-tance braking was identified the maximum source of inductive interference from metro DC traction systems affecting track circuit sys-tems.Additionally,by analyzing the relationship between the spectrum characteristics of induced emissions from the traction systems and the IGBT switching frequencies for chopping,a spectrum management method was adopted to reassign induced emissions characteristic frequencies of traction systems,resulting in staggered sensitive frequency bands for the track circuits.The experimental results demon-strate the effectiveness of the proposed inductive interference suppression strategy in reducing the risk of inductive interference caused by train traction systems on the track circuits.
万方数据
维普
