Study on Modular Multi-Level DC-DC Converter with Cell Voltage Balancing and Fast Output Response Using Sub Commutation Circuits
Study on Modular Multi-Level DC-DC Converter with Cell Voltage Balancing and Fast Output Response Using Sub Commutation Circuits
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DOI：
10.23919/icpe2019-ecceasia42246.2019.8797337
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发表时间：
2019-05
期刊：
影响因子：
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通讯作者：
H. Obara;M. Katayama;A. Kawamura;J. Xu;N. Shimosato;S. Inoue
中科院分区：
文献类型：
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作者：
H. Obara;M. Katayama;A. Kawamura;J. Xu;N. Shimosato;S. Inoue
用于电池测试的直流电源在电动汽车(EVS)、移动设备和可再生能源发电的开发中变得越来越重要。近十年来，模块化多电平变流器(MMC)得到了积极的研究，并开始在一些实际应用中得到应用，如高中压DC-AC或AC-DC功率转换器。然而，广泛使用的MMC拓扑在扩展到DC-DC转换器方面有一个重要的问题，因为它不能实现不同于DC-AC和AC-DC转换的每个单元的电容电压平衡。因此，大多数基于MMC的DC-DC转换器都是通过DC-AC转换器、隔离变压器或电感和AC-DC转换器相结合来实现的。本研究对MMC的DC-DC运行方式及其存在的问题进行了分析和澄清。提出了一种在不使用DC-AC和AC-DC转换器的情况下，具有单元电压平衡和快速动态响应的基于MMC的DC-DC转换器的电路拓扑和控制方法。仿真结果验证了电容电压均衡控制的有效性。最后，在一台六单元样机上进行了实验，结果表明该电路具有良好的电压均衡控制性能和快速的动态响应能力。
DC power supplies for a battery testing are becoming significantly important for developments of electrical vehicles (EVs), mobile devices, and renewable energy generations. In the recent decade, modular multi-level converters (MMC) have been actively studied and started to use on some practical applications such as high- or medium-voltage DC-AC or AC-DC power converters. However, the widely used MMC topology has a significant issue to extend to a DC-DC converter, because it cannot achieve capacitor voltage balancing of each cell unlike the case of the DC-AC and AC-DC conversions. Therefore, most of the MMC-based DC-DC converters are realized by combining the DC-AC converter, isolation transformer or inductor, and AC-DC converter. In this study, the DC-DC operation in the MMC and its problem are analyzed and clarified. This paper proposes a circuit topology and control method of the MMC-based DC-DC converter with cell voltage balancing and fast dynamic response while the DC-AC and AC-DC converters are not used. Simulation results verify the validity of the capacitor voltage balancing control. Finally, an experimental result in a prototype converter with 6-cells using SiC-MOSFETs shows the performances of the voltage balancing control and fast dynamic response.