计及动车组多种工况的牵引网谐波分析与抑制

采用多导体传输线等效降阶法建立了CRH2型动车组和某实际复线自耦变压器(AT)牵引网车网联合仿真模型,仿真分析了动车组处于固定位置、动态运行、不同工况、不同功率时各种因素对牵引网谐振频率以及谐振点处谐波电流放大倍数的影响规律,并通过部分实测数据验证了所建模型和分析方法的有效性.最后提出采用C型滤波器来抑制谐波电流,在确保装设滤波器后车网系统达到良好电气匹配的基础上,给出了滤波器电气参数设计和安装位置选取方法,并对最佳位置分区所(SP)处加装滤波器后的牵引网谐波电流放大抑制效果进行了仿真验证.

Analysis and Suppression on Harmonic of Traction Net Considering Various Conditions for Electric Motor Units

The train net coupling simulated model combined CRH2 type high speed electric motor units (EMUs) with the certain actual double track auto transformer (AT) structure traction net is built by multi conductor transmission line equivalent order reduction method. With the model, the influences of various factors on resonance frequency and harmonic current amplification factor of traction net when EMUs run in fixed positions, dynamic positions, different conditions and different power are analyzed. The simulation results are verified by the measured data. In the end, C type filter is proposed to suppress the harmonic current, and the methods of parameters design and installation location selection for filter are proposed to make sure the electrical matching between EMUs and traction nets after filtering. The corresponding suppression effects of traction net harmonic current amplification are also simulated and validated when C type is installed at satisfied section post (SP).