Total Suppression of High-Frequency Transient Oscillations in Dual-Active-Bridge Series Resonant Converter by Trajectory-Switching Modulation

Chuan Sun, Xingyue Jiang, Lingling Cao, K. H. Loo

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

Dual-active-bridge series resonant converter (DABSRC) is increasingly used in many emerging power electronics applications requiring fast dynamic responses. However, under conventional transient phase-shift modulation strategy, DABSRC generally suffers from large-amplitude transient oscillations when its phase-shift angle is changed abruptly by a high-gain controller. These oscillations occur at the beat frequency, which result from the interaction between the switching-frequency and resonant-frequency components in the series-resonant tank during transient states. Besides incurring high voltage and current stresses on the power-stage devices, these transient oscillations also span many switching cycles between the original and new steady states and cause perturbations to the output voltage of DABSRC, thereby degrading its dynamic performance and output voltage quality. To mitigate this problem, a new transient modulation strategy, known as trajectory-switching modulation (TSM), is proposed for achieving an accurate and computationally efficient trajectory planning of the resonant voltages and currents of DABSRC during transient states, and its basic operation is to govern the transient switching patterns of the gating signals according to a simple set of closed-form equations. It guarantees convergence to the next new steady state within one switching cycle and avoids costly sensors and complex computation for implementation, and is inherently compatible with high-gain controller for realizing oscillation-free fast dynamic response.

Original languageEnglish
Article numberArticle number 9663010
JournalIEEE Transactions on Power Electronics
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • Dual-active-bridge (DAB) converter
  • dynamic response
  • Hafnium
  • Modulation
  • Oscillators
  • phase-shift modulation
  • series resonant converter
  • Steady-state
  • Switches
  • Transient analysis
  • transient oscillations
  • Voltage

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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