Performance analysis of a triple-active bridge converter for interconnection of future dc-grids
Performance analysis of a triple-active bridge converter for interconnection of future dc-grids
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用于未来直流电网互连的三有源桥式变换器的性能分析
DOI：
10.1109/ecce.2016.7855337
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
R. D. De Doncker
中科院分区：
文献类型：
--
作者：
M. Neubert;A. Gorodnichev;Jan Gottschlich;R. D. De Doncker
直流-直流变换器是未来直流电网互联的一种很有前途的技术。除了相对较低的体积和空间要求外，DC-DC转换器还提供了良好的功率流可控性。这对于更加分散的能量产生尤其重要，其中期望完全双向的功率流（甚至在相等电压水平的电网之间）以提高整体电网效率和稳定性。本文分析了三相三有源桥式变换器（3ph-TAB）的性能，该变换器连接一个5 kV中压直流电网和两个标称电压分别为380 V和760 V的低压直流电网。首先，描述了变换器的调制策略。不同的情况下的操作进行了分析，并开发了一种方法，显着简化了转换器的理论分析。推导并分析了Transformer和直流环节电容的漏感设计指标。此外，软开关的边界推导出解析。整个工作范围的半导体损耗模拟支持的理论评估。
Dc-dc converters are a promising technology for interconnection of future dc grids. Besides the relatively low volume and space requirements, dc-dc converters provide good controllability of the power flow. This is particularly important with regard to a more decentralized energy generation, where a fully bidirectional power flow — even between grids of equal voltage levels — is desired to increase overall grid efficiency and stability. This paper analyzes the performance of a three-phase triple-active bridge converter (3ph-TAB) which interconnects a 5 kV medium-voltage dc grid and two low-voltage dc grids with nominal voltages of 380 V and 760 V, respectively. First, the modulation strategy of the converter is described. The different cases of operation are analyzed and a method is developed which significantly simplifies the theoretical analysis of the converter. The design specifications for the leakage inductances of the transformer and the dc-link capacitors are derived and analyzed. Furthermore, the soft-switching boundaries are derived analytically. The theoretical assessment is supported by a semiconductor loss simulation for the whole operating range.