发表机构
Thayer School of Engineering, Dartmouth College; University of Washington（达特茅斯学院塔耶尔工程学院; 华盛顿大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出一种局部能量函数方法，用于含构网型与跟网型逆变器的电力系统暂态稳定分析，考虑耦合阻尼效应，并在IEEE 14节点系统上验证了其有效性与小保守性。
AI 中文摘要
基于逆变器的资源（IBRs）的广泛部署正通过其控制策略重塑电力系统动态。跟网型（GFL）和构网型（GFM）逆变器预计将长期共存。然而，确保此类系统的暂态稳定性仍是一个关键且尚未充分探索的挑战。本文利用新推导的局部能量函数，对混合GFM-GFL逆变器系统进行了全面的暂态稳定分析。首先推导了系统的暂态稳定分析模型，以揭示暂态响应过程中GFL和GFM逆变器之间的动态相互作用。然后提出了一种局部能量函数，用于解析暂态稳定评估。所提出的局部能量函数没有忽略或对逆变器的耦合阻尼效应做出苛刻假设，而是通过局部界定系统能量耗散性质成立的区域，仔细处理了其对系统暂态稳定性的影响。该性质充分考虑了GFL和GFM逆变器的综合阻尼效应。推导出的临界能量和稳定指数提供了快速且定量的暂态稳定评估。此外，深入研究了GFM逆变器阻尼不足对系统暂态稳定的不利影响。在修改后的IEEE 14节点系统上，通过混合GFL和GFM逆变器验证了所提方法的有效性，数值仿真结果进一步证明了所提方法的小保守性。
英文摘要
The widespread deployment of inverter-based resources (IBRs) is reshaping power system dynamics by their control strategies. Grid-following (GFL) and grid-forming (GFM) inverters are expected to co-exist from now on. However, ensuring the transient stability of such systems remains a critical and underexplored challenge. In this paper, a comprehensive transient stability analysis of the mixed-GFM-GFL inverter system is conducted using a newly derived local energy function. The transient stability analysis model of the system is first derived to reveal the dynamic interactions between GFL and GFM inverters during transient responses. A local energy function is then proposed for analytical transient stability assessment. Instead of ignoring or making harsh assumptions on inverters' coupled damping effect, the proposed local energy function carefully addresses its impact on system transient stability by locally bounding the region where the system's energy dissipation property holds. Such a property fully considers the combined damping effect of GFL and GFM inverters. The derived critical energy and stability index provide a fast and quantitative transient stability assessment. Furthermore, the adverse impact of insufficient damping of GFM inverters on system transient stability is thoroughly investigated. The effectiveness of the proposed method is validated on the modified IEEE 14-bus system with mixed GFL and GFM inverters, and the numerical simulation results further demonstrate the small conservativeness of the proposed method.
