This article proposes a new asymmetric neutral-point diode-clamped (NPC) multilevel converter for a four-phase switched reluctance motor drive. The inbuilt NPC clamping capacitors are used for both voltage level clamping and also as dc rail voltage-boosting capacitors to increase the output power of the motor, particularly for high-speed electric vehicle applications. The new converter allows regenerative energy to be recovered back to the dc supply for rapid machine braking, thus increasing overall drive efficiency. Analysis of the different modes of converter operation, along with design equations for sizing the voltage-boosting capacitors, is detailed. The effect of capacitance on boost voltage and increased motor base speed is presented. Simulation and experimental results confirm the effectiveness of the proposed converter.

中文翻译：

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用于四相 SRM 驱动的具有固有电压提升的中性点二极管钳位转换器

本文提出了一种用于四相开关磁阻电机驱动的新型非对称中性点二极管钳位 (NPC) 多电平转换器。内置 NPC 钳位电容器既用于电压电平钳位，也用作直流轨升压电容器，以增加电机的输出功率，尤其适用于高速电动汽车应用。新转换器允许将再生能量回收回直流电源以快速制动机器，从而提高整体驱动效率。详细分析了转换器操作的不同模式，以及确定升压电容器大小的设计方程式。介绍了电容对升压电压和提高电机基本速度的影响。仿真和实验结果证实了所提出的转换器的有效性。