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LEI Yang,QUAN Xiangjun,HUANG Alex.Solid-state Transformer Hardware Design Based on Modular Architecture[J].JOURNAL OF POWER SUPPLY,2019,17(5):4-10
Solid-state Transformer Hardware Design Based on Modular Architecture
Received:May 29, 2019  Revised:September 12, 2019
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DOI:10.13234/j.issn.2095-2805.2019.5.4
Keywords:solid-state transformer(SST)  modularity  cascaded H-bridge  dual-active-bridge
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LEI Yang Semiconductor Power Electronics Center, University of Texas at Austin, Austin 78758, USA
QUAN Xiangjun Semiconductor Power Electronics Center, University of Texas at Austin, Austin 78758, USA
HUANG Alex Semiconductor Power Electronics Center, University of Texas at Austin, Austin 78758, USA aqhuang@utexas.edu
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Abstract:
      A solid-state transformer(SST) has extensive application prospects in the fields of smart grid and electr-ic drive system. However, the high complexity in hardware implementation and control strategy significantly lowers its competitiveness in practical applications. In this paper, an SST hardware design based on modular architecture was proposed. The power stage adopted a scheme, which consisted of a cascaded H-bridge(CHB) rectifier, a dual-active-bri-dge(DAB) isolated DC/DC converter, and a parallel H-bridge inverter. Since the whole power stage was only built by the same H-bridge, the level of the system's modularity can be significantly improved. Meanwhile, in coordination with the modular hardware architecture, the controller and auxiliary circuit for the circuit module were also designed to further improve the system's modularity. The proposed SST hardware design not only significantly reduced the construction cost of the overall system, but also simplified the implementation of the controller, thus improving the flexibility and reliability.
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