论文标题

混合角度控制和网格形成功率转换器的几乎全局稳定性

Hybrid Angle Control and Almost Global Stability of Grid-Forming Power Converters

论文作者

Tayyebi, Ali, Anta, Adolfo, Dörfler, Florian

论文摘要

本文引入了针对电源转换器的新的网格形成控制,该控制器称为混合角控制(HAC),可确保几乎全局的闭环稳定性。 HAC将最近提出的匹配控制与新颖的非线性角度反馈相结合,让人联想到(尽管与经典下垂)和可调节的虚拟振荡器控件(尽管并不相同)。 HAC的合成灵感来自基于DC的匹配和基于AC的网格形成控件的互补益处,以及来自直接角度控制和非线性阻尼分配的想法。提出的HAC应用于高保真非线性转换器模型,该模型通过动态电感线连接到无限总线或无限中心动态网格模型。我们为闭环平衡的存在,独特性和全球稳定性提供了有见地的参数条件。与相关的稳定证书不同,我们的参数条件不需要强大的物理阻尼,相反,可以通过适当选择控制参数来满足它们。此外,我们考虑了功率转换器的安全限制,并合成了与HAC兼容的新电流限制控制。最后,我们提出了HAC的实际实现,并揭示了其内在的下垂行为,得出了前馈交流电压和功率控制,并使用公开可用的数值示例说明了闭环系统的行为。

This paper introduces a new grid-forming control for power converters, termed hybrid angle control (HAC) that ensures the almost global closed-loop stability. HAC combines the recently proposed matching control with a novel nonlinear angle feedback reminiscent of (though not identical to) classic droop and dispatchable virtual oscillator controls. The synthesis of HAC is inspired by the complementary benefits of the dc-based matching and ac-based grid-forming controls as well as ideas from direct angle control and nonlinear damping assignment. The proposed HAC is applied to a high-fidelity nonlinear converter model that is connected to an infinite bus or a center-of-inertia dynamic grid models via a dynamic inductive line. We provide insightful parametric conditions for the existence, uniqueness, and global stability of the closed-loop equilibria. Unlike related stability certificates, our parametric conditions do not demand strong physical damping, on the contrary they can be met by appropriate choice of control parameters. Moreover, we consider the safety constraints of power converters and synthesize a new current-limiting control that is compatible with HAC. Last, we present a practical implementation of HAC and uncover its intrinsic droop behavior, derive a feedforward ac voltage and power control, and illustrate the behavior of the closed-loop system with publicly available numerical examples.

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