External disturbances, system uncertainties, and various load characteristics, e.g., deadtime effect, computation time delay, circuit parameter uncertainty, and the constant power load (CPL), can lead to tracking errors that even result in instability in the output voltage of dual-active-bridge (DAB) converters. To address those challenges and improve the output performance, an uncertainty and disturbance estimator (UDE)-based robust voltage control scheme is proposed in this article. First, a generic dynamic model for DAB converters is proposed based on the converter output current to simplify the controller design, which integrates the DAB circuit model with the phase-shift control scheme. Then, the UDE-based voltage controller is presented based on the proposed model, and the stability performance is discussed in detail. With the CPLs, the output impedance of the UDE-controlled DAB converter is also modeled for the first time to show the stability boundary. Based on the derived stability criteria, the design of the UDE controller is summarized. A series of comparative experiment studies has been conducted, and the results prove that the proposed scheme can notably improve the voltage tracking performance and extend the stability boundary of the DAB converters when feeding CPLs even under significant parameter uncertainties.

中文翻译：

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基于不确定性和干扰估计器的双有源桥转换器鲁棒跟踪控制

外部干扰、系统不确定性和各种负载特性，例如死区时间效应、计算时间延迟、电路参数不确定性和恒功率负载 (CPL)，都会导致跟踪误差，甚至导致双路输出电压不稳定。有源桥 (DAB) 转换器。为了应对这些挑战并提高输出性能，本文提出了一种基于不确定性和干扰估计器 (UDE) 的稳健电压控制方案。首先，提出了基于转换器输出电流的通用 DAB 转换器动态模型，以简化控制器设计，将 DAB 电路模型与相移控制方案集成在一起。然后，基于所提出的模型提出了基于 UDE 的电压控制器，并详细讨论了稳定性性能。有了 CPL，UDE 控制的 DAB 转换器的输出阻抗也首次建模以显示稳定性边界。基于导出的稳定性准则，总结了 UDE 控制器的设计。已经进行了一系列对比实验研究，结果证明，即使在参数不确定的情况下，当馈送 CPL 时，所提出的方案也能显着提高电压跟踪性能并扩展 DAB 转换器的稳定性边界。