This paper proposes a neutral section passing strategy for preventing the inrush current of an electric railway vehicle (ERV) with a solid-state transformer (SST). This inrush current is not generated when the ERV passes the neutral section by maintaining a dc-link voltage at a constant level that is higher than the peak voltage of an electric railway feeder using regenerative energy from the ERV. Depending on the position of the ERV, the control strategies and modes are changed. When the ERV passes the neutral section, the regenerative energy from the ERV charges the dc-link voltage. A dc–ac converter that operates a traction motor takes charge of the dc-link voltage control in the regeneration operation. Simulation results show that the proposed strategy can protect the SST from inrush current when the ERV passes the neutral section. Experiments have been carried out with a scaled-down prototype. Experimental results verify the performance of the proposed neutral section passing strategy.

本文提出了一种防止带有固态变压器 (SST) 的电动铁路车辆 (ERV) 涌入电流的中性部分通过策略。当 ERV 通过中性线段时，通过将直流链路电压保持在高于使用 ERV 再生能量的电气铁路馈线的峰值电压的恒定水平，不会产生这种涌入电流。根据 ERV 的位置，控制策略和模式会发生变化。当 ERV 通过中性线段时，来自 ERV 的再生能量为直流母线电压充电。操作牵引电机的直流-交流转换器负责再生操作中的直流母线电压控制。仿真结果表明，当 ERV 通过中性部分时，所提出的策略可以保护 SST 免受浪涌电流的影响。已经使用缩小的原型进行了实验。实验结果验证了所提出的中性路段通过策略的性能。