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Modular-multilevel converter topologies and applications – a review

机译：模块化多电平转换器拓扑和应用–评论

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摘要

Recently developed modular-multilevel converter (M-MC) has a major attention in the industry and research works which is moving into feasible technology for many medium and high-power applications. M-MCs have been improved by existing power conversion technology in several aspects, including efficiency, modular structure, power quality, transformerless operational capability, fault tolerant and redundancy operations having a low expense, standard components utilisation, high availability, excellent quality of output wave forms. However, as several challenges combined with M-MC topologies, include reduced voltage stress, compact size, and substantially lower semiconductor losses. These attributes the lower operating cost for high-power applications such as distribution systems and high-voltage direct current (HVDC) transmission systems. The main contribution of this study is to bring the scrutiny of M-MC applications and different circuit topologies. These M-MC configurations consist of converter structures with sub-module converters and M-MC family members. In such a way, the M-MC applications are generalised and it results the size and cost halved, reduced conduction and switching losses and increases system reliabilities. Moreover, in each application of M-MC, drawbacks, and advantages have been discussed in detail. This review presents the latest performance of M-MC with respect to the mentioned research areas and new applications.
机译：最近开发的模块化多电平转换器（M-MC）在业界和研究工作中引起了广泛关注，并且正在向许多中大功率应用的可行技术转移。现有的功率转换技术已在多个方面对M-MC进行了改进，包括效率，模块化结构，电能质量，无变压器操作能力，低成本的容错和冗余操作，标准组件利用率，高可用性，出色的输出波质量形式。但是，与M-MC拓扑结合的几个挑战包括降低电压应力，紧凑的尺寸以及大大降低的半导体损耗。这些特性为配电系统和高压直流（HVDC）传输系统等大功率应用降低了运营成本。这项研究的主要贡献是对M-MC应用和不同电路拓扑进行了审查。这些M-MC配置由具有子模块转换器和M-MC系列成员的转换器结构组成。通过这种方式，M-MC应用得以推广，其尺寸和成本降低了一半，导通和开关损耗降低，并提高了系统可靠性。而且，在M-MC的每个应用中，已经详细讨论了缺点和优点。这篇综述介绍了M-MC在上述研究领域和新应用方面的最新性能。

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