The multisystem locomotive traction drive system (MLTDS) is fed by different kinds of railway traction power supply systems (TPSS). The direct connection of the DC TPSSs and the traction inverter are broadly adopted. However, the DC-link voltage is influenced by the variable and fluctuant catenary voltage, therefore wasting the capacity of the devices, complicating the wiring of motor as well as reducing the reliability of system. In this paper, the line-side converter, which is used as an AC/DC four-quadrant converter in AC supply system, is reconfigured as a DC/DC chopper for DC voltage matching in DC supply systems. The quadruple interleaved structure is adopted to eliminate the current ripple caused by the chopper. Firstly, structures and corresponding switching method of the reconfigurable line-side converter are introduced. With help of modal analysis, the principle of chopper operation, the mechanism and influencing factors of current ripple suppression are revealed. The system control method and configuration switching algorithm for voltage matching and stabilizing are then presented. Finally, the proposed conceives are validated by hardware-in-the-loop experiments.

中文翻译：

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用于多系统机车直流电压匹配和纹波抑制的可重构线侧转换器

多系统机车牵引驱动系统（MLTDS）由不同种类的铁路牵引供电系统（TPSS）供电。直流TPSS与牵引逆变器的直接连接被广泛采用。然而，直流母线电压受悬链线电压可变、波动的影响，因此浪费了设备的容量，使电机接线复杂化，降低了系统的可靠性。在本文中，在交流供电系统中用作 AC/DC 四象限变换器的线侧变换器被重新配置为 DC/DC 斩波器，用于直流供电系统中的直流电压匹配。采用四重交错结构，消除斩波器引起的电流纹波。首先介绍了可重构线侧变换器的结构和相应的切换方法。借助模态分析揭示斩波器的工作原理、抑制电流纹波的机理及影响因素。然后介绍了用于电压匹配和稳定的系统控制方法和配置切换算法。最后，所提出的构想通过硬件在环实验进行验证。