高速铁路全并联AT供电系统串联谐振分析

为分析牵引供电系统串联谐振问题,提出一种新的分析方法。利用五导体链式电路和恒功率模型,建立精确的高速铁路全并联AT供电系统模型。由于在机车恒功率建模中,其等效阻抗随着不同的接触网电压而变化。为描述其恒功率特性,介绍一种基于节点导纳矩阵的机车等效阻抗的迭代方法。在此基础上,利用支路法分析全并联自耦变压器(autotransformer,AT)供电系统在不同运行工况下(不同机车数量、位置、功率等)的谐波电流放大和串联谐振现象。分别针对上行单机车、2机车和上下行各1辆机车3种工况进行分析。结果表明支路法能有效分析单谐波源与多谐波源下的串联谐振。

Series Resonance Analysis in High-speed Railway All-paralle AT Traction Power Supply System

This paper proposed an analysis method for the issue of series resonance in the traction power supply system.In this paper,an accurate model of all-parallel autotransformer(AT)-fed system in the AC high-speed railway was constructed by using a five-conductor chain constructor and a constant power train model.For the constant power model,the equivalent impedance of the train changes with the different catenary potential of the traction lines.Thus,an iteration algorithm for calculating the train impendence was raised on the basis of the system node matrix.In addition,this paper presented a branch analysis–based method to determine the harmonic currents amplification and series resonance under different conditions(e.g.different numbers,locations and power demands of trains,etc.).Finally,the results of three cases were studied: one train on up track,two trains at up track,and one train at up track and the other one at down track.The tests showed that the branch analysis–based method is effective for study series resonance with both single harmonic source and multiple harmonic sources.