Study on a motor drive using a modular multilevel converter

本研究已处理的模块化多电平变换器（MMC），被认为是下一代多电平变换器的重点，其应用于中压电机驱动器之一。研究表明，MMC可以在不使用公共直流端子之间连接的任何直流链路电容器的情况下工作。此外，还提出了一种控制方法，以实现在低速下的稳定操作，而不会引起任何过电压和/或过电流。此外，一个稳定的启动从静止到标称速度已实现通过应用共模电压注入方法在这项研究中开发的。电机驱动器的有效性已被证实的实验使用400 V，15千瓦缩小模型。

This study has dealt with a modular multilevel converter (MMC) that is considered as one of the next-generation multilevel converters with a focus on its applications to medium-voltage motor drives. The study has shown that the MMC can operate without using any dc-link capacitors connected between the common dc terminals. Moreover, it has proposed a control method to achieve stable operation at low speed without inducing any overvoltage and/or overcurrent. Moreover, a stable startup from the standstill to the nominal speed has been achieved by applying the common-mode voltage injection method developed in this study. The validity of the motor drive has been confirmed by experiment using a 400-V, 15-kW downscaled model.