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Feedforward Modulation Technique for More Accurate Operation of Modular Multilevel Converters
IEEE Transactions on Power Electronics ( IF 6.7 ) Pub Date : 2021-08-16 , DOI: 10.1109/tpel.2021.3104984
Pablo Montero-Robina , Abraham Marquez Alcaide , Mohamed Dahidah , Sergio Vazquez , Jose Ignacio Leon , Georgios GAE Konstantinou , Leopoldo Garcia Franquelo

Modular multilevel converters have become the prominent topology for medium- and high-voltage applications. The performance of these converters highly depends on the accuracy of the used modulation approach, for which the capacitor voltage of submodules (SM) are usually assumed to be equal. This article exhibits that ignoring the capacitor voltage differences among SMs adversely affects the system performance. This becomes more obvious the larger the capacitor voltage differences are. Hence, this article proposes a more accurate feedforward modulation approach that takes into account either the instantaneous capacitor voltage value and the real output voltage in the modulation stage. As a result, in applications where larger SM voltage differences are expected, the current distortion and control performance are improved. Particularly, switching–saving approaches benefit from this method as it enables their operation with reduced switching losses without the downsides of increased distortion due to capacitor voltage differences. The proposed approach is analyzed and compared with the nearest-level modulation and with the level-shift PWM. Simulations and experimental validation are presented to confirm the effectiveness of the proposed technique.

中文翻译:

使模块化多电平转换器更准确运行的前馈调制技术

模块化多电平转换器已成为中高压应用的主要拓扑结构。这些转换器的性能在很大程度上取决于所使用的调制方法的准确性,为此通常假设子模块 (SM) 的电容器电压相等。本文表明,忽略 SM 之间的电容器电压差异会对系统性能产生不利影响。电容器电压差越大,这变得越明显。因此,本文提出了一种更准确的前馈调制方法,它考虑了调制阶段的瞬时电容器电压值和实际输出电压。因此,在预期较大 SM 电压差的应用中,电流失真和控制性能得到改善。特别,节省开关的方法受益于这种方法,因为它可以在降低开关损耗的情况下运行,而不会因电容器电压差异而增加失真。对所提出的方法进行了分析,并将其与最近电平调制和电平移位 PWM 进行了比较。模拟和实验验证被提出以确认所提出的技术的有效性。
更新日期:2021-10-19
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