Multilevel Dual Active Bridge Leakage Inductance Selection for Various DC-Link Voltage Spans

Babak Khanzadeh (), Torbjörn Thiringer and Mohammad Kharezy
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Babak Khanzadeh: Division of Electric Power Engineering, Chalmers University of Technology, 412 96 Göteborg, Sweden
Torbjörn Thiringer: Division of Electric Power Engineering, Chalmers University of Technology, 412 96 Göteborg, Sweden
Mohammad Kharezy: Division of Electric Power Engineering, Chalmers University of Technology, 412 96 Göteborg, Sweden

Energies, 2023, vol. 16, issue 2, 1-18

Abstract: The leakage inductance of the transformer in a dual active bridge (DAB) dc–dc converter directly impacts the ac current waveforms and the power factor; thus, it can be considered a design requirement for the transformer. In the existing literature, a choice is made to either ensure soft switching in nominal power or to minimize the RMS current of the transformer. The inductance is typically obtained using optimization procedures. Implementing these optimizations is time-consuming, which can be avoided if a closed-form equation is derived for the optimum leakage inductance. In this paper, analytical formulas are derived to estimate the desired leakage inductance such that the highest RMS value of the current in the operation region of a DAB is kept to its minimum value. The accuracy and sensitivity of the analytical solutions are evaluated. It is shown that in a large design domain, the solution for the YY-connected MFT has a less than 3% error compared to the results obtained from an optimization engine. As an example of the importance of selecting the leakage inductance correctly, it is shown that for 11% deviations in the dc link voltages, a 10% deviation from the desired leakage inductance value can cause 2% higher RMS currents in the converter.

Keywords: dc–dc power conversion; dual active bridge (DAB); modular multilevel converter (MMC); leakage inductance; optimization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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