DC fault isolation study of bidirectional dual active bridge DC/DC converter for DC transmission grid application

Yasen A. Harrye, Khaled H. Ahmed, Ahmed A. Aboushady

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Abstract

Fast isolation and detection of DC faults is currently a limiting factor in high power DC transmission grid development. Recent research has shown that the role of DC/DC converters is becoming increasingly important in solving various DC grid challenges such as voltage stepping, galvanic isolation and power regulation. This paper focuses on an additional important feature of bidirectional dual active bridge (DAB) DC-DC converters which make it attractive for future DC grids; it’s inherent fault isolation capability which does not need control intervention to limit fault current in case of the most severe DC faults. Detailed analytical, simulation and experimental study are performed by subjecting the converter to DC short circuit faults at its DC voltage terminals. The results obtained have shown significant advantage of DAB where fault current is less than rated current during the fault duration. Thus no control action is necessary from the non-faulted bridge to limit fault current and no external DC circuit breakers are required. This advantage makes DAB converter feasible for DC grid integration.
Original languageEnglish
Title of host publicationIECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society
PublisherIEEE
ISBN (Electronic)978-1-4799-1762-4
DOIs
Publication statusPublished - 2015

Keywords

  • circuit faults
  • bridge circuits
  • fault currents
  • DC-DC power converters
  • simulation

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