MMC-Topology for High-Current and Low-Voltage Applications with Minimal Number of Submodules, Reduced Switching and Capacitor Losses
MMC-Topology for High-Current and Low-Voltage Applications with Minimal Number of Submodules, Reduced Switching and Capacitor Losses
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适用于高电流和低电压应用的 MMC 拓扑，具有最少数量的子模块、减少的开关和电容器损耗
DOI：
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发表时间：
2019
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通讯作者：
J. Boecker
中科院分区：
文献类型：
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作者：
R. Unruh;F. Schafmeister;N. Froehleke;J. Boecker
由于MMC的最新发展，它们如今被用于许多中压和高功率应用中，但仍然需要在低电压下实现高功率的高效和模块化解决方案，例如用于电解。拟议的Y-MMC将电网AC电压转换为DC电压，并且LLC转换器连接到每个子模块电容器，以向DC负载提供所需的电流。本文提出了一种拓扑结构，只使用一半的子模块的数量，而且减少了三分之一的有效开关频率，同时保持相同的THD和输出功率的YY MMC。
Due to recent developments in MMCs, they are used in many medium-voltage and high-power applications today, but efficient and modular solutions for high-power at low-voltage such as for electrolysis are still required. The proposed Y-MMC converts the grid AC-voltage into a DC-voltages, and an LLC converter is connected to each submodule capacitor to provide the required current to the DC-load. This paper proposes a topology that uses only half the number of submodules and moreover to reduce the effective switching frequency by a third, while preserving the same THD und output power of an YY-MMC.