基于阻抗分压原理的牵引网谐波谐振研究

为了研究牵引网谐波谐振特性，建立了基于戴维南谐波电压源模型的牵引供电系统车网互联谐波电路模型，采用阻抗分压原理分析了牵引网谐振过电压的产生机理。利用Matlab/Simulink仿真软件研究了牵引网谐波谐振特性及谐振过电压现象。仿真结果表明:当机车变流器交流侧电压谐波含量较大的频率与牵引网谐振点频率重合时，将导致车顶网压谐波含量较大从而造成牵引网谐振过电压的出现，通过改变机车变流器斩波频率或供电臂长度可以抑制牵引网谐振过电压。

Study on harmonic resonance of traction network based on the principle of impedance voltage divider

In order to research the harmonic resonance characteristics of the traction network, an equivalent harmonic circuit model of train-catenary integrated system is established based on the Thevenin harmonic voltage source model, and the mechanism of the traction network resonance over-voltage is analyzed based on the principle of the impedance voltage divider. The simulation study of the harmonic resonance characteristics of the traction network and the phenomenon of the traction network resonance over-voltage is made based on Matlab/Simulink. The simulation results show that the content of the roof grid voltage harmonics is very large when the frequency of greater content of the locomotive converter AC side voltage harmonic coincides with the frequency of the traction network resonance point, which cause the traction network resonance over-voltage, and the traction network resonance over-voltage can be suppressed by changing the carrier frequency of the locomotive converter and the length of the power arm. This work is supported by Fundamental Research Funds for the Central Universities (No. 2015JBM085).