Control and Experiment of Pulsewidth-Modulated Modular Multilevel Converters
Control and Experiment of Pulsewidth-Modulated Modular Multilevel Converters
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DOI：
10.1109/tpel.2009.2014236
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发表时间：
2009-07-01
影响因子：
6.7
通讯作者：
Akagi, Hirofumi
中科院分区：
文献类型：
--
作者：
Hagiwara, Makoto;Akagi, Hirofumi
模块化多电平变换器（MMC）是下一代多电平变换器之一，用于无变压器的高压或中压功率变换。MMC是基于每个引脚的多个双向斩波单元的级联连接，因此需要多个浮动直流电容器的电压平衡控制。然而，还没有文献对电压平衡控制进行明确的理论和实验验证。本文研究了两种脉宽调制模块化多电平变换器（PWM-MMC）的电路结构和电压平衡控制。平均和平衡控制的组合使得PWM-MMC能够在没有任何外部电路的情况下实现电压平衡。通过仿真和实验验证了PWM-MMC的可行性以及电压平衡控制的有效性。
A modular multilevel converter (MMC) is one of the next-generation multilevel converters intended for high- or medium-voltage power conversion without transformers. The MMC is based on cascade connection of multiple bidirectional chopper-cells per leg, thus requiring voltage-balancing control of the multiple floating dc capacitors. However, no paper has made an explicit discussion on voltage-balancing control with theoretical and experimental verifications. This paper deals with two types of pulsewidth-modulated modular multilevel converters (PWM-MMCs) with focus on their circuit configurations and voltage-balancing control. Combination of averaging and balancing controls enables the PWM-MMCs to achieve voltage balancing without any external circuit. The viability of the PWM-MMCs, as well as the effectiveness of the voltage-balancing control, is confirmed by simulation and experiment.