地铁供电系统直流母线电压谐振机理研究  

Research on DC Bus Voltage Resonance Mechanism for Metro Power Supply System

作　　者：王楠清 刘少春 田行军 唐涛 沈泽华 WANG Nanqing;LIU Shaochun;TIAN Xingjun;TANG Tao;SHEN Zehua(CRRC Zhuzhou Institute Co.,Ltd.,Zhuzhou,Hunan 412001,China;School of Electrical and Electronic Engineering,Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China)

机构地区：[1]中车株洲电力机车研究所有限公司,湖南株洲412001 [2]石家庄铁道大学电气与电子工程学院,河北石家庄050043

出　　处：《控制与信息技术》2024年第5期25-32,共8页CONTROL AND INFORMATION TECHNOLOGY

摘　　要：地铁安全运行依赖于供电系统的稳定性和可靠性。随着行车密度的不断增大和新能源系统的高密度并网应用,地铁供电系统的电气特性时常会发生较大变化,不仅牵引侧可能出现类似线路短路的特殊负荷,且直流母线可能会产生谐振现象。为此,针对母线电压非线性振荡问题,文章首先建立了交流侧整流变压器电路的三阶非线性非自治状态方程的数学模型;然后通过增加一个时间维,将三阶非自治系统转换成四阶自治系统,利用数值分析的方法对系统的三维相图、相平面图、庞加莱映射图与分岔图进行探究;最后将仿真模拟得到的混沌波形通过24脉波整流后与现场实测振荡电压波形进行对比。结果表明,所得到的仿真波形与实录波形在幅值与频率上基本一致,从原理层面证明电网波动是引发地铁牵引供电系统非线性振荡的原因之一。The operational safety of metro systems depends on the stability and reliability of their power supply systems.With the continuously increased traffic density and the massive grid connection of new energy systems,metro power supply systems suffer from frequent significant changes in electrical characteristics,such as special loads similar to short circuits potentially occurring on the traction side,and DC bus resonance.This paper aims to response to the problem of nonlinear oscillations in bus voltage.A mathematical model of the third-order nonlinear nonautonomous equation of state was established for the rectifier transformer circuit at the AC side.By adding a time dimension,the third-order nonautonomous system was transformed into a fourth-order autonomous system,and numerical analysis was conducted to examine the three-dimensional phase diagrams,phase plane diagrams,Poincare mapping diagrams,and bifurcation diagrams of the system.The chaotic waveforms obtained from simulations were compared with the oscillation voltage waveforms measured on site after 24-pulse rectification.The comparative analysis results showed that the simulated waveforms basically aligned with the recorded waveforms in terms of amplitude and frequency,proving that the occurrence of significant fluctuations in power grids contributes to nonlinear oscillations in the traction power supply system of metro systems.

关 键 词：地铁供电系统 直流母线电压谐振 非自治系统 铁磁混沌电路 动力学行为 

分 类 号：U231[交通运输工程—道路与铁道工程]