Analysis of DC Fault for Dual Active Bridge DC/DC Converter including Prototype Verification

M. I. Rahman, K. H. Ahmed, D. Jovcic

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)
8 Downloads (Pure)


This paper presents DC fault analysis for a dual active bridge DC/DC converter which comprises of two active bridges and an internal medium frequency transformer. This topology provides galvanic isolation, voltage step up/down and bidirectional power transfer. The DC fault study assumes the DC terminal voltage of the converter is at zero. The steady state fault current is limited to a low magnitude which is less than the rated value without any controller action depending on the design of the converter. The DC faults current magnitudes are analyzed with AC equivalent circuit where only the fundamental component of the AC voltages and inductor current are considered. Phase shift and AC voltage magnitude modulation control methods are selected. A detailed dual active bridge DC/DC converter 3 MW, 4/40 kV based system is simulated using MATLAB/Simulink to validate the proposed analytical study. Further, hardware testing is conducted to confirm the DC fault studies with a 500 W 24/100 V prototype.
Original languageEnglish
Pages (from-to)1107-1115
Number of pages9
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Issue number2
Early online date17 Jul 2018
Publication statusPublished - 1 Jun 2019


  • DC terminal fault
  • dual-active bridge (DAB)
  • high-power applicatioin
  • high-power application


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