Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 67, Issue 10, Pages 8587-8598Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2019.2947809
Keywords
Transient analysis; Steady-state; Inductors; Stress; Circuit faults; Bridge circuits; Magnetic flux; DC-bias current; dynamics; dual-active-bridge (DAB) converter; phase-shift control; transient
Categories
Funding
- Research Development Fund of XJTLU [RDF-16-01-10, RDF-17-01-28]
- Research Enhancement Fund of XJTLU [REF-17-01-02]
- Suzhou Prospective Application Programme [SYG201723]
- XJTLU Key Programme Special Fund [KSF-A-08, KSF-E-13, KSF-T-04]
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A transient dc-bias current due to the voltage-second imbalance of isolated bidirectional dual-active-bridge (DAB) converters for the disturbance in line or load may result in the transformer saturation and oscillations in both sides dc currents. This article focuses on the transient dc-bias current elimination by using an improved triple-phase-shift (ITPS) control for DAB converters. The inductor peak current stress optimization is adopted in the proposed ITPS to determine the steady-state phase-shift variables. Originated from the dc-bias current model of DAB converters with the TPS control, the transient phase-shift adjustment strategy can be determined, which has the ability to improve the inductor current changing slope and shorten the settling time. Both simulation and experiments for different conditions are provided to evaluate main dynamic indexes such as the transient period, dc-bias current, and inductor current stress for three different transition cases. The proposed ITPS is proved as a promising solution in eliminating the dc-bias current, minimizing the transient current stress.
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