Maintaining bus voltage stability is a central challenge in dc microgrids (MGs). This article introduces a decentralized adaptive energy-shaping approach (DEC) that seamlessly merges constant voltage and droop mode (DM) controls, ensuring the comprehensive large-signal stability of the MG. Central to the DEC’s architecture is its stratification of the MG into autonomous distributed unit (DU) subsystems. Using a nonlinear observer, this strategy effectively recognizes the electrical interactions among individual DU subsystems, obviating auxiliary output current sensors. This structured approach breaks down the intricate stability challenges of the MG into more manageable sections. These sections are carefully designed to address estimated couplings and reinforce each DU subsystem’s resilience. The introduced stabilization method, inspired by the passivity-based port-controlled Hamiltonian (pcH) system theory, adopts a passive control damping mechanism coupled with a dynamically adjusted interconnection coefficient. This ensures a smooth stability of DU subsystems, even when faced with significant disturbances. Rigorous theoretical analyses, underpinned by the Lyapunov theorem, corroborate the systemic stability conferred by the DEC design. Furthermore, it demonstrates robustness against unforeseen input voltage variations. Simulations and experiments demonstrate that the proposed control approach accelerates system recovery and broadens the stability margin.

中文翻译：

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分布式自适应能量整形，用于直流微电网中具有大信号稳定性的集成电压调节


保持母线电压稳定性是直流微电网 (MG) 的核心挑战。本文介绍了一种分散式自适应能量整形方法 (DEC)，该方法无缝融合恒压和下垂模式 (DM) 控制，确保 MG 的全面大信号稳定性。 DEC 架构的核心是将 MG 分层为自治分布式单元 (DU) 子系统。该策略使用非线性观测器，有效地识别各个 DU 子系统之间的电气相互作用，从而无需辅助输出电流传感器。这种结构化方法将 MG 复杂的稳定性挑战分解为更易于管理的部分。这些部分经过精心设计，旨在解决估计的耦合问题并增强每个 DU 子系统的弹性。所引入的稳定方法受到基于无源性的端口控制哈密顿（pcH）系统理论的启发，采用无源控制阻尼机制与动态调整互连系数相结合。这确保了 DU 子系统的平稳稳定性，即使在面临重大干扰时也是如此。以李亚普诺夫定理为基础的严格理论分析证实了 DEC 设计所赋予的系统稳定性。此外，它还展示了针对不可预见的输入电压变化的鲁棒性。仿真和实验表明，所提出的控制方法加速了系统恢复并扩大了稳定性裕度。