A Modular DC to Three-Phase AC Converter Topology with Minimized Intermediate Energy Storage Requirements
A Modular DC to Three-Phase AC Converter Topology with Minimized Intermediate Energy Storage Requirements
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DOI：
10.1109/apec43580.2023.10131333
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发表时间：
2023-03
期刊：
影响因子：
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通讯作者：
Wiwin Hartini;Mahima Gupta
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文献类型：
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作者：
Wiwin Hartini;Mahima Gupta
模块化多电平转换器 (MMC) 因其模块化性和可扩展性而成为高功率转换领域颇具吸引力的候选者。能量存储元件，即MMC模块电路中的模块电容，通常很大并且需要非常大的模块电容器。除了降低功率密度之外，传统设计还需要电解电容器，进一步影响转换器的整体效率和可靠性。这项工作提出了一种 MMC 模块拓扑和相应的调制方法，可显着降低模块电容要求（几微法拉与毫法拉）。所提出的拓扑通过提出基于直流到三相交流电桥概念的集成模块设计，消除了单相交流处理功率要求（传统设计的一个特点）。这种三相集成设计使模块电容器每个开关周期的交流处理能力为零。作为权衡，臂电感经过精心分配，以在模块中使用单向电压阻断器件。这项工作通过使用 PLECS 的电路仿真和实验室规模的实验原型进行了验证。仿真和实验结果验证了所提出的允许高功率密度模块化转换器的分析方法。与笨重的电解电容器相比，微型薄膜电容器用于满足模块的能量存储要求。
Modular Multilevel Converter (MMC) is an attractive candidate in high power conversion due to its modularity and scalability. The energy storage element, namely the module capacitance in the MMC module circuit, is typically large and requires very bulky module capacitors. In addition to deteriorating the power density, the conventional design necessitates electrolytic capacitors, further affecting the overall converter efficiency and reliability. This work presents an MMC module topology and the accompanying modulation approach that significantly reduces the module capacitance requirements (few micro-farads versus milli-farads). The proposed topology eliminates the single-phase AC processing power requirement, a characteristic of the conventional design, by presenting an integrated module design based on a DC-to-three-phase AC bridge concept. This three-phase integrated design results in zero AC processing power for the module capacitors per switching cycle. As a trade-off, the arm inductances are carefully distributed to use unidirectional voltage blocking devices in the modules. The work is verified using circuit simulations using PLECS and a laboratory-scale experimental prototype. The simulation and experimental results verify the proposed analytical approach permitting highly power dense modular converters. In contrast to bulky electrolytic capacitors, tiny film capacitors are utilized for the module's energy storage requirements.