Modeling and optimization of dual active bridge DC-DC converter with dead-time effect under triple-phase-shift control

Chaochao Song, Alian Chen*, Yiwei Pan, Chunshui Du, Chenghui Zhang

*Corresponding author

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Dead-time effect has become an apparent issue in high-switching-frequency high-power dual active bridge (DAB) DC-DC converter. This paper gives a detailed analysis of phase-shift errors effect caused by dead time, including output voltage offset, soft-switching failure, optimal scheme failure, etc. Phase-shift errors effect will invalidate traditional analyses of optimal control and mislead the design of DAB converter. To overcome these drawbacks, various operating modes and an accurate transmission power model incorporating dead time under triple-phase-shift (TPS) control are developed. On this basis, an optimal TPS incorporating dead time (TPSiDT) scheme is further proposed to minimize the current stress, while guaranteeing soft-switching operation by using Lagrange multiplier method (LMM) and Genetic Algorithm (GA). The novel transmission power model can provide accurate power flow computation to avoid phase-shift errors. Therefore, in practical applications, the minimum current stress and soft-switching operation can be guaranteed, and the efficiency of DAB converter can be improved. Finally, the experimental results verify the feasibility of the proposed TPSiDT scheme.
Original languageEnglish
Article numberen12060973
JournalEnergies
Volume12
Issue number6
ISSN1996-1073
DOIs
Publication statusPublished - Mar 2019
Externally publishedYes

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Keywords

  • Current stress
  • Dead-time effect
  • Dual active bridge DC-DC converter
  • Phase-shift errors
  • Soft-switching operation
  • Transmission power model

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