高速铁路弓网离线在线识别及应对策略

Identification and response strategy for pantograph-catenary contact loss in high-speed railway

电气化铁路车辆运行过程中,受电弓与接触网之间的短暂分离(即弓网离线)易引发过电流问题,产生安全隐患、影响铁路运营秩序。文章基于既有动车组牵引电传动系统,介绍其主电路结构及网侧整流器的控制方法,分析弓网离线对系统的影响,着重研究弓网离线后恢复接触时产生过电流问题的原因,提出弓网离线在线快速识别及应对策略。文章搭建了包含电弧模型的牵引电传动系统全数字实时仿真模型,首先通过与实测波形对比证明模型的准确性,然后基于该模型验证文中提出的弓网离线在线识别及应对策略。

Transient disconnection between pantographs and catenaries during train operation on electrified railways,known as pantograph-catenary contact loss,can cause issues like over-current,creating safety hazards and consequential disruptions to operational order.This paper introduces the main circuit structure and control method of grid-side rectifiers of the prevailing traction electric drive systems for EMU.The analysis investigated the system impacts of pantograph-catenary contact loss,emphasizing the reasons for over-current occurrences during contact recovery,leading to the establishment of a rapid online identification method and a response strategy.Following developing a full-digital real-time simulation model of the electric drive systems for traction,which includes an arc model,accuracy verification was conducted firstly through waveform comparisons with actual measurements.This model was subsequently used to verify the proposed identification method and response strategy for pantograph-catenary contact loss.