论文标题
同步机和电网功率转换器的频率稳定性
Frequency Stability of Synchronous Machines and Grid-Forming Power Converters
论文作者
论文摘要
全球电力系统向近100％基于可再生能源的一代过渡的不可避免的结果是，同步机，其惯性以及随附的频率和电压控制机制丧失了传统的散装产生。电力系统向低惯性系统的这种逐步转换导致维持系统稳定性的挑战。预计转换器的新型控制技术，即所谓的网格形成策略，将解决这些挑战和复制功能，这些功能迄今已由同步机提供。本文提出了一项低渗透案例研究，其中包括在各种网格形成技术下控制的同步机和转换器。在这项工作中1）突出显示了网格形成转换器对同步机器频率稳定性的积极影响，2）一个定性分析，提供了对系统频率稳定性的见解，3）我们探索了对网格形成控制的行为，在对电流限制的过程中施加了a and and An的重要性，4）and and and a and a and An a and An a and An）的重要性以及DC的重要性，以及DC的重要性。报告了限制方案，最后5）我们分析了快速网格形成转换器与慢速同步机动力学之间的相互作用的方式以及何时会有助于系统的不稳定性
An inevitable consequence of the global power system transition towards nearly 100% renewable-based generation is the loss of conventional bulk generation by synchronous machines, their inertia, and accompanying frequency and voltage control mechanisms. This gradual transformation of the power system to a low-inertia system leads to critical challenges in maintaining system stability. Novel control techniques for converters, so-called grid-forming strategies, are expected to address these challenges and replicate functionalities that so far have been provided by synchronous machines. This article presents a low-inertia case study that includes synchronous machines and converters controlled under various grid-forming techniques. In this work 1) the positive impact of the grid-forming converters on the frequency stability of synchronous machines is highlighted, 2) a qualitative analysis which provides insights into the frequency stability of the system is presented, 3) we explore the behavior of the grid-forming controls when imposing the converter dc and ac current limitations, 4) the importance of the dc dynamics in grid-forming control design as well as the critical need for an effective ac current limitation scheme are reported, and lastly 5) we analyze how and when the interaction between the fast grid-forming converter and the slow synchronous machine dynamics can contribute to the system instability
