An Online Efficiency Optimization Strategy Based on Variable-Frequency Phase-Shift Modulation for Dual-Active-Bridge Converters

The DC transformer (DCT) is a key equipment of the power router. To improve the DCT efficiency, this paper proposes a variable-frequency phase-shift modulation (VFPSM) strategy for the dual-active-bridge (DAB) converter which operates at the fixed voltage-transfer-ratio. The optimal switching freque...

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Bibliographic Details
Published in2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023 - ECCE Asia) pp. 2892 - 2897
Main Authors Yin, Yanxiang, Wang, Wei, Wang, Nan, Chen, Alian
Format Conference Proceeding
LanguageEnglish
Published The Korean Institute of Power Electronics 22.05.2023
Subjects
Asia
Dual-active-bridge converter
Frequency modulation
online efficiency optimization
Phase modulation
PI control
Power electronics
power router
Switching frequency
Switching loss
variable-frequency phase-shift modulation
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Summary:The DC transformer (DCT) is a key equipment of the power router. To improve the DCT efficiency, this paper proposes a variable-frequency phase-shift modulation (VFPSM) strategy for the dual-active-bridge (DAB) converter which operates at the fixed voltage-transfer-ratio. The optimal switching frequency can be calculated by the VFPSM strategy online through the proposed loss model to ensure that the total of switching loss, conduction loss, and core loss is the minimum under different output powers. Besides, the frequency control and phase-shift control are decoupled by using the proposed frequency compensation factor, which would not affect the characteristics of the original DAB control method. Experimental results show that compared with conventional fix switching frequency control, the proposed VFSPM strategy can improve efficiency over a wide power range, and efficiency can be improved by up to 7.4%.
ISSN:2150-6086
DOI:10.23919/ICPE2023-ECCEAsia54778.2023.10213535