Low-Frequency Oscillation Suppression in Series Resonant Dual-Active-Bridge Converters under Fault Tolerant Operation

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Abstract

When an open-switch fault occurs in the inverter-side of the series resonant dual-active-bridge (SRDAB) converter, the rectified DC voltage will drop by a half. One solution to maintain the continuous power supply of the converter is to regulate the duty-cycle of the rectifier output voltage. Nevertheless, it may excite the resonance between the resonant inductors and the DC capacitors and lead to severe low-frequency oscillations, which appears as the envelope of the high-frequency current. This phenomenon may trigger the over-current protection and make the SRDAB fail to ride through the fault. In this paper, a low-frequency equivalent model is proposed for the SRDAB, enabling frequency-domain analysis of the conventional single-loop voltage control. It is revealed that the oscillation depends on the duty-cycle and control parameters, and it is not possible to suppress such oscillations by the conventional control method. Thus, a dual-loop fault tolerant control method consists of an outer voltage control-loop, an inner current envelope control-loop. Also a non-linear correction unit is proposed to suppress the oscillation. Experimental tests on a 1-kW SRDAB are performed. The test results have validated the effectiveness of the proposal in terms of oscillation suppression.
Original languageEnglish
Title of host publicationProceedings of 2019 IEEE Energy Conversion Congress and Exposition (ECCE)
Number of pages7
PublisherIEEE Press
Publication dateSep 2019
Pages1499-1505
Article number8913130
ISBN (Print)978-1-7281-0396-9
ISBN (Electronic)978-1-7281-0395-2
DOIs
Publication statusPublished - Sep 2019
Event2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Baltimore, United States
Duration: 29 Sep 20193 Oct 2019

Conference

Conference2019 IEEE Energy Conversion Congress and Exposition (ECCE)
CountryUnited States
City Baltimore
Period29/09/201903/10/2019
SeriesIEEE Energy Conversion Congress and Exposition
ISSN2329-3721

    Fingerprint

Keywords

  • Photovoltaic (PV) systems
  • Inverters
  • Maximum power point tracking (MPPT)
  • Interharmonics
  • Power quality
  • Series resonant converter
  • Dual-active-bridge (DAB) converter
  • Fault tolerant control
  • DC distribution systems
  • Oscillation suppression

Cite this

Pan, Y., Yang, Y., He, J., Sangwongwanich, A., & Blaabjerg, F. (2019). Low-Frequency Oscillation Suppression in Series Resonant Dual-Active-Bridge Converters under Fault Tolerant Operation. In Proceedings of 2019 IEEE Energy Conversion Congress and Exposition (ECCE) (pp. 1499-1505). [8913130] IEEE Press. IEEE Energy Conversion Congress and Exposition https://doi.org/10.1109/ECCE.2019.8913130