Quad-Active-Bridge DC–DC Converter as Cross-Link for Medium-Voltage Modular Inverters
Quad-Active-Bridge DC–DC Converter as Cross-Link for Medium-Voltage Modular Inverters
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DOI：
10.1109/tia.2016.2633539
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发表时间：
2017-03
影响因子：
4.4
通讯作者：
L. Costa;G. Buticchi;Marco Liserre
中科院分区：
文献类型：
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作者：
L. Costa;G. Buticchi;Marco Liserre
固态变压器（SST）的主要挑战之一在于dc-dc级的实现。本文研究了一种四有源桥式（QAB） dc-dc变换器作为模块化三级SST的基本模块。除了高功率密度和软开关操作（其他变换器也有）的特点外，QAB变换器还提供了一种减少高频变压器数量的解决方案，因为相同的多绕组变压器连接了更多的桥。为了保证QAB变换器在整个工作范围内实现软开关，将以前双有源桥式变换器采用的三角电流模调制策略扩展到QAB变换器。理论分析考虑了平衡（中压电池处理的功率相等）和不平衡（中压电池处理的功率不等）条件。为了验证本文的理论分析，建立了一个2千瓦的样机并进行了实验。
One of the main challenges of the solid-state transformer (SST) lies in the implementation of the dc–dc stage. In this paper, a quadruple-active-bridge (QAB) dc–dc converter is investigated to be used as a basic module of a modular three-stage SST. Besides the feature of high power density and soft-switching operation (also found in others converters), the QAB converter provides a solution with reduced number of high-frequency transformers, since more bridges are connected to the same multiwinding transformer. To ensure soft switching for the entire operation range of the QAB converter, the triangular current-mode modulation strategy, previously adopted for the dual-active-bridge converter, is extended to the QAB converter. The theoretical analysis is developed considering balanced (equal power processed by the medium-voltage (MV) cells) and unbalanced (unequal power processed by the MV cells) conditions. In order to validate the theoretical analysis developed in the paper, a 2-kW prototype is built and experimented.