This paper presents a nine-level active-neutral-point-clamped (ANPC) based multilevel inverter (MLI) topology for grid-connected applications requiring only ten switches. The envisaged structure comprises two parts, namely five-level ANPC unit, and a two-level converter leg whose midpoint is used as another ac terminal. An ad hoc switching state redundancy based modulation strategy is used to ensure that the voltage across the flying capacitor is tightly balanced and is implemented using a look-up table further simplifies the control complexity. The performance and effectiveness of the proposed topology with its control scheme are validated through simulations and experimental tests. Comparison with other MLIs is included to highlight the merits of the proposed topology. From the results, it will be shown that the proposed inverter requires the least part count as compared to other topologies with the same performance and output quality.

中文翻译：

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针对并网应用减少部件数量的九级改进型 ANPC 逆变器拓扑的运行和控制


本文提出了一种基于九电平有源中性点钳位 (ANPC) 的多电平逆变器 (MLI) 拓扑，适用于仅需要十个开关的并网应用。设想的结构包括两部分，即五电平ANPC单元和一个两电平转换器支路，其中点用作另一个交流端子。基于特设开关状态冗余的调制策略用于确保快速电容器两端的电压紧密平衡，并使用查找表实现，进一步简化了控制复杂性。通过仿真和实验测试验证了所提出的拓扑及其控制方案的性能和有效性。与其他 MLI 的比较是为了突出所提出的拓扑的优点。结果表明，与具有相同性能和输出质量的其他拓扑相比，所提出的逆变器需要最少的部件数量。