城市轨道交通牵引供电PWM变流器的研究

研究采用一种多通道PWM变流器实现城市轨道交通牵引变电站的降压变流功能,为轨道交通车辆负载提供电能的同时能够向电网回馈车辆的再生制动能量,维持直流供电电压的稳定.该变流器各通道通过移相变压器叠加(即阶梯波合成技术)来实现谐波抵消,因此该变流器能在非常低的开关频率下实现能量双向传递.并且交流电流谐波含量低、滤波容易、输入功率因数高.另外,该变流器采用旋转坐标系下的解祸控制和瞬时值闭环控制技术,实现了良好的动态性能.最后通过实验验证了该变流器的稳态和动态性能.

Study on a PWM Converter for Traction Power Supply of the Urban Rail Transit

This paper introduces a multi-module converter for traction power supply of the urban rail transit,with the function of both providing the traction power and feeding the regeneration energy back to the AC grid.Each converter module is con-nected with a phase shift transformer and the outputs of the transformers are series connected to neutralization harmonics,which is also called staircase systemization technique.So the converter can achieve the bidirectional energy transfer with very low switching frequency,and the harmonic content of the input current is very low and easy to filter out.Decoupling control and instantaneous value feedback control in the d,q ,0 frame is adopted in the control system to achieve good dynamic regulation performance.The experimental results validate the static and dynamic performance of the converter.