含并网逆变器（IBR）的次同步振荡电网建模充分性案例研究
A Case Study on Modeling Adequacy of a Grid with Subsynchronous Oscillations Involving IBRs
AI总结：
本文针对含GFC的电网建模充分性开展案例研究，修改IEEE基准模型引发SSO，对比SPC、QPC与EMT仿真，证明考虑线路动态的SPC模型可捕捉SSO模式，明确其价值与局限。
摘要：
本文以基于构网型变流器（GFC）的可再生能源接入电网的建模充分性为研究对象开展案例研究。为此，对4机11母线IEEE基准模型进行修改，用GFC替代同步发电机，引发了不稳定的次同步振荡（SSO）。本研究旨在：（a）明确此类场景下是否需要考虑输电网络动态；（b）重新审视平衡条件下d-q坐标系中的空间相量演算（SPC），该方法可捕捉此类现象并适用于特征值分析；（c）强调此类模型的局限性，同时凸显其在大规模电力系统仿真中的重要性。将SPC模型、准稳态相量演算（QPC）模型的时域和频域结果，与基于电磁暂态（EMT）的仿真结果进行对比。结果表明，SPC框架下考虑输电线路动态的模型可捕捉SSO模式，而忽略这些动态的QPC模型无法做到这一点。
英文摘要：
A case study on modeling adequacy of a grid in presence of renewable resources based on grid-forming converters (GFCs) is the subject matter of this paper. For this purpose, a 4-machine 11-bus IEEE benchmark model is modified by considering GFCs replacing synchronous generators that led to unstable subsynchronous oscillations (SSOs). We aim to: (a) understand if transmission network dynamics should be considered in such cases, (b) revisit the space-phasor-calculus (SPC) in d-q frame under balanced condition that captures such phenomena and lends itself to eigenvalue analysis, and (c) emphasize limitations of such models while underscoring their importance for large-scale power system simulations. Time-domain and frequency-domain results from SPC and quasistationary phasor calculus (QPC) models are compared with electromagnetic transient (EMT)-based simulations. It is shown that models with transmission line dynamics in SPC framework can capture the SSO mode while QPC models that neglect these dynamics fail to do so.
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