Generic closed loop controller for power regulation in dual active bridge DC/DC converter with current stress minimization

Osama M. Hebala, Ahmed A. Aboushady, Khaled Ahmed, Ibrahim Abdelsalam

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Abstract

This paper presents a comprehensive and generalized analysis of the bidirectional dual active bridge (DAB) DC/DC converter using triple phase shift (TPS) control to enable closed loop power regulation while minimizing current stress. The key new achievements are: a generic analysis in terms of possible conversion ratios/converter voltage gains (i.e. Buck/Boost/Unity), per unit based equations regardless of DAB ratings, and a new simple closed loop controller implementable in real time to meet desired power transfer regulation at minimum current stress. Per unit based analytical expressions are derived for converter AC RMS current as well as power transferred. An offline particle swarm optimization (PSO) method is used to obtain an extensive set of TPS ratios for minimizing the RMS current in the entire bidirectional power range of -1 to 1 per unit. The extensive set of results achieved from PSO presents a generic data pool which is carefully analyzed to derive simple useful relations. Such relations enabled a generic closed loop controller design that can be implemented in real time avoiding the extensive computational capacity that iterative optimization techniques require. A detailed Simulink DAB switching model is used to validate precision of the proposed closed loop controller under various operating conditions. An experimental prototype also substantiates the results achieved.
Original languageEnglish
Pages (from-to)4468 - 4478
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Volume66
Issue number6
Early online date1 Aug 2018
DOIs
Publication statusPublished - Jun 2019

Keywords

  • current stress
  • triple phase shift (TPS)
  • particle swarm optimization (PSO)

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