牵引网与交直交列车耦合系统谐波谐振特性仿真研究

Simulation Study of the Harmonic Resonance Characteristics of the Coupling System With a Traction Network and AC-DC-AC Trains

为考察牵引网与交直交列车耦合系统谐波谐振特性,基于列车四象限变流器的工作机理,搭建牵引网与交直交列车耦合谐波谐振分析模型;分析耦合系统谐振产生的机理及谐振频率与危害度的影响因素。基于Matlab/Simulink搭建了牵引网与列车负荷联合仿真系统,仿真分析谐振对网压的影响;针对联合仿真系统,提出一种谐振频率辨识方法;基于该方法,针对列车不同功率、不同位置、不同运行工况,仿真分析耦合系统谐振频率的变化规律。仿真研究结果表明:本文建立的耦合谐波谐振分析模型能有效分析牵引网与列车耦合系统的谐波谐振机理与特性;联合仿真系统可用于深入研究谐振对耦合系统的影响,为有效降低谐振危害提供思路。

In order to research the harmonic resonance characteristics of the coupling system of a traction network and ac-dc-ac trains, a coupling resonance analytical model was established based on the working mechanism of the train＇s four-quadrant converter. The resonance mechanism of the coupling system and the influencing factors of the resonance frequencies and resonance damage degree were analyzed based on it. Then a combined simulation system comprising a traction network and trains was put up based on Matlab/Simulink, and the simulation study of the resonance influence on the power net voltage was made. A resonant frequency identification method was put forward, and it was applied to research the resonant frequency variations of the coupling system under the different powers, the different positions and the different operating modes. The simulation results show that the coupling resonance analytical model presented by this paper is effective to analyze the resonance mechanism and characteristics of the coupling system, and the combined simulation system is useful for further studying the resonance influences on the coupling system, and it provides ideas to reduce the resonance damages.