CURRENT STRESS OPTIMIZATION STRATEGY FOR DAB CONVERTER BASED ON DOUBLE PHASE SHIFT MODULATION

Yue Gaili; Feng Lishi; Xiang Fuwei; Du Guanghui

doi:10.19912/j.0254-0096.tynxb.2024-1824

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (2) : 345-354. DOI: 10.19912/j.0254-0096.tynxb.2024-1824

CURRENT STRESS OPTIMIZATION STRATEGY FOR DAB CONVERTER BASED ON DOUBLE PHASE SHIFT MODULATION

Yue Gaili¹, Feng Lishi¹, Xiang Fuwei², Du Guanghui¹

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Abstract

Aiming at the problem of accelerated battery aging due to high current stress in DC microgrid energy storage system, the peak current optimization of DAB converter under double phase shift modulation is investigated. Firstly, the commutation process and operating characteristics of the DAB converter under double phase-shift modulation are analyzed. Then, in order to reduce the current stress during voltage mismatch, the study takes the peak current expression as the objective function, constructs a mathematical model using the KKT condition, and solves the optimal shift ratios for the four operating modes of the Buck mode under double phase-shift modulation. The optimal shift ratio is substituted into the boundary conditions of each mode, and the local optimal power transfer range of current stress is derived. By comparing the magnitude of the current stress of the four modes, the current stress optimization scheme suitable for the full power range adaptive ZVS mode is constructed to ensure that the current stress reaches the optimal level in the full power range. Finally, it is experimentally verified that the adaptive ZVS mode modulation has less current stress compared with SPS modulation and full ZVS mode modulation during voltage mismatch operation.

Key words

DC microgrid / dual active bridge / dual phase-shift / current stress / zero voltage switching / KKT condition

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Yue Gaili, Feng Lishi, Xiang Fuwei, Du Guanghui. CURRENT STRESS OPTIMIZATION STRATEGY FOR DAB CONVERTER BASED ON DOUBLE PHASE SHIFT MODULATION[J]. Acta Energiae Solaris Sinica. 2026, 47(2): 345-354 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1824

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