Quad-active-bridge dc-dc converter as cross-link for medium-voltage modular inverters

Levy Ferreira Costa, Giampaolo Buticchi, Marco Liserre

Research output: Journal PublicationArticlepeer-review

86 Citations (Scopus)


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.

Original languageEnglish
Article number7762728
Pages (from-to)1243-1253
Number of pages11
JournalIEEE Transactions on Industry Applications
Issue number2
Publication statusPublished - 1 Mar 2017
Externally publishedYes


  • DC-DC converter
  • multiwinding transformer
  • solid-state transformer (SST)
  • triangular current modulation (TCM)

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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