Steady-state operation of dual active bridge (DAB) ac–dc converters can show a high dependence on the circuit nonidealities and on the transient nature of the consistently changing phase-shifts necessary to achieve ac–dc operation. These aspects are not fully captured using traditional modeling approaches derived from dc–dc DAB converter analyses. To address these issues, this article presents a unified modeling approach comprising of hybrid frequency and time-domain analyses that encompass the transient nature of the ac–dc converter while providing the advantages of steady-state frequency-domain analysis. The limitations of conventional modeling approaches are quantified and addressed. Additionally, a comprehensive analysis of modeling error trends with converter parameters is presented, which demonstrates the effectiveness of the proposed method over conventional methods. Finally, using the proposed modeling approach, a numerical optimization routine is proposed to find the optimal-conduction-loss modulation trajectory. The effectiveness of the method is verified by experimental testing on a 1 kW, 230–28 V fully GaN-based single-phase DAB ac–dc converter.

中文翻译：

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考虑电路非理想性和周期内瞬态效应的双有源桥交流转换器的稳态建模


双有源桥 (DAB) 交流-直流转换器的稳态操作可能表现出对电路非理想性以及实现交流-直流操作所需的持续变化相移的瞬态性质的高度依赖性。使用源自 DC-DC DAB 转换器分析的传统建模方法无法完全捕获这些方面。为了解决这些问题，本文提出了一种由混合频域和时域分析组成的统一建模方法，该方法涵盖了交流-直流转换器的瞬态特性，同时提供了稳态频域分析的优点。传统建模方法的局限性得到量化和解决。此外，还对转换器参数的建模误差趋势进行了综合分析，证明了所提出的方法相对于传统方法的有效性。最后，使用所提出的建模方法，提出了一种数值优化例程来找到最佳传导损耗调制轨迹。该方法的有效性通过在 1 kW、230–28 V 全 GaN 单相 DAB ac-dc 转换器上进行的实验测试得到验证。