Transient DC bias elimination of dual-active-bridge DC-DC converter with improved triple-phase-shift control

Qinglei Bu, Huiqing Wen*, Jiacheng Wen, Yihua Hu, Yang Du

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

76 Citations (Scopus)

Abstract

A transient dc-bias current due to the voltage-second imbalance of isolated bidirectional dual-active-bridge (DAB) converters for the disturbance in line or load may result in the transformer saturation and oscillations in both sides dc currents. This article focuses on the transient dc-bias current elimination by using an improved triple-phase-shift (ITPS) control for DAB converters. The inductor peak current stress optimization is adopted in the proposed ITPS to determine the steady-state phase-shift variables. Originated from the dc-bias current model of DAB converters with the TPS control, the transient phase-shift adjustment strategy can be determined, which has the ability to improve the inductor current changing slope and shorten the settling time. Both simulation and experiments for different conditions are provided to evaluate main dynamic indexes such as the transient period, dc-bias current, and inductor current stress for three different transition cases. The proposed ITPS is proved as a promising solution in eliminating the dc-bias current, minimizing the transient current stress.

Original languageEnglish
Article number8879697
Pages (from-to)8587-8598
Number of pages12
JournalIEEE Transactions on Industrial Electronics
Volume67
Issue number10
DOIs
Publication statusPublished - Oct 2020

Keywords

  • DC-bias current
  • dual-active-bridge (DAB) converter
  • dynamics
  • phase-shift control
  • transient

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