Stability assessment of a system comprising a single machine and inverter with scalable ratings

Yashen Lin, Brian B. Johnson, V. Gevorgian, Victor Purba, S. Dhople
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引用次数: 32

Abstract

Synchronous machines have traditionally acted as the foundation of large-scale electrical infrastructures and their physical properties have formed the cornerstone of system operations. However, with the increased integration of distributed renewable resources and energy-storage technologies, there is a need to systematically acknowledge the dynamics of power-electronics inverters — the primary energy-conversion interface in such systems — in all aspects of modeling, analysis, and control of the bulk power network. In this paper, we assess the properties of coupled machine-inverter systems by studying an elementary system comprised of a synchronous generator, three-phase inverter, and a load. The inverter model is formulated such that its power rating can be scaled continuously across power levels while preserving its closed-loop response. Accordingly, the properties of the machine-inverter system can be assessed for varying ratios of machine-to-inverter power ratings. After linearizing the model and assessing its eigenvalues, we show that system stability is highly dependent on the inverter current controller and machine exciter, thus uncovering a key concern with mixed machine-inverter systems and motivating the need for next-generation grid-stabilizing inverter controls.
由单机和具有可扩展额定值的逆变器组成的系统的稳定性评估
传统上,同步电机是大型电力基础设施的基础,其物理特性构成了系统运行的基石。然而,随着分布式可再生资源和能源存储技术的日益整合,有必要系统地承认电力电子逆变器的动态-这类系统中的主要能量转换接口-在大电网建模,分析和控制的各个方面。在本文中,我们通过研究一个由同步发电机、三相逆变器和负载组成的初级系统来评估耦合机-逆变系统的性能。逆变器模型的制定使得其额定功率可以在功率级上连续缩放,同时保持其闭环响应。因此,可以对机器-逆变器额定功率的不同比率评估机器-逆变器系统的特性。在线性化模型并评估其特征值后,我们表明系统稳定性高度依赖于逆变器电流控制器和机器励磁器,从而揭示了混合机器逆变器系统的关键问题,并激发了对下一代电网稳定逆变器控制的需求。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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