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| A novel dual-phase-shift current stress optimization control strategy for dual-active-bridge converters |
| DOI：10.19783/j.cnki.pspc.240690 |
| Key Words:dual active bridge converter dual phase shift current stress backflow power |
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| Abstract:To address the issue of excessive current stress in dual-active-bridge (DAB) converters caused by mismatched input-output voltage regulation ratios in the dual-phase-shift (DPS) control, a novel segmented current stress optimization control strategy under DPS modulation is proposed. The strategy reduces current stress by lowering the inductive voltage, thereby improving system efficiency. First, the working principle of the novel DPS modulation is analyzed, verifying that reducing the inductive voltage can significantly reduce current stress. Then, considering different transmission power levels and voltage regulation ratios, the current stress in the corresponding operating ranges is optimized in segments. The optimal phase shift ratio combination under the minimum current stress is derived, and a closed-loop control strategy is designed based on the segmented optimization of current stress. Finally, a prototype of the DAB converter is built, and experimental validation is carried out. The results indicate that, compared to other optimized control methods, the proposed control strategy achieves lower current stress and backflow power in the low-to-medium power range, and provides faster dynamic response during load transients. |
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