Modified dual active bridge DC/DC converter with improved efficiency and interoperability in hybrid LCC/VSC HVDC transmission grids

Ahmed A. Aboushady*, Khaled H. Ahmed, Ibrahim Abdelsalam

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

DC transmission grids are the promising electrical networks in the near future especially with the high penetration of large scale renewables. This paper proposes a modified version of the dual active bridge (DAB) DC/DC converter with AC link capacitors generating reactive power to compensate for non-active power consumption; hence mitigating current stresses and losses to improve efficiency. The proposed topology also enables the connectivity of current source line-commutated HVDC and voltage source HVDC technologies particularly during power reversal; a feature which conventional DAB is incapable of doing. Analysis and detailed design of the proposed converter are addressed and a comparative performance analysis is carried out with conventional DAB. Converter principle of operation is explained and Matlab/Simulink simulations are carried out to verify converter operation particularly under adverse conditions such as rated power reversal and DC fault conditions. A low scale prototype substantiates the theoretical analysis and simulation results.
Original languageEnglish
Number of pages11
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
DOIs
Publication statusPublished - 15 Oct 2020

Keywords

  • DC/DC converter
  • dual active bridge (DAB)
  • hybrid HVDC grids
  • line commutated converter (LCC)
  • voltage source converter (VSC)

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