轻型动车牵引电力电子变压器的研究

Research on light train traction power electronics transformer

传统的铁道电力机车、动车采用单相工频牵引变压器,由于空间限制不利于减轻重量和提升功率,采用电力电子牵引变压器PETT可有效避免其缺点。提出一种带中频变压器MFT的模块化PETT,基于单相dq矢量变换方法,输入级整流器采用载波移相技术,旨在改善网侧电流谐波、提高效率。基于Matlab/Simulink的仿真平台建立了PETT系统,仿真结果验证了在大扰动情况下PETT控制策略的有效性,表明PETT在大扰动情况下,各模块直流电压均衡,网侧电流谐波小,并保持好的动态调节性能和较高的工作效率。

Traditional railway traction adapts single grid industrial frequency transformer,which is not good to reduce weight and increase rating power and power electronic traction transformer（ PETT） can avoid such disadvantages. A topology with medium frequency transformer is presented and it adopts carrier phase-shifting technology in order to reach the following purposes： small grid current distortion rate,small grid power fluctuation,reduced switching loss and unit power factor. The simulation results verify that PETT achieves balanced direct voltages and power ratings among each modules,under large disturbance,PETT not only improves grid current quality but also has a good dynamic property.