连接到发电机的电网跟踪和电网形成变流器的稳定性分析
Stability Analysis of Grid-Following and Grid-Forming Converters Connected to Generators
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中文总结 AI 辅助
研究连接发电机的GFL和GFM变流器稳定性，通过特征值轨迹等深入小信号分析，在不同电网强度场景比较二者，经时域仿真验证结果，揭示VSC主导电网稳定性受电网强度和VSC功率强烈影响。
中文摘要 AI 辅助
本文研究了电网跟踪（GFL）和电网形成（GFM）电压源变流器（VSC）与同步发电机（SG）之间的主要相互作用，捕捉了实际电网的动态特性，并指出在稳定性研究中考虑理想电网的局限性。通过研究特征值轨迹和参与因子进行深入的小信号分析。具体而言，通过改变额定功率和电网短路比，在不同电网强度场景下比较GFL和GFM变流器。然后进行非线性和线性系统的时域仿真以验证稳定性分析的数学结果。结果表明，由于VSC控制与SG之间的耦合，VSC主导的电网在GFL或GFM模式下的稳定性受电网强度和VSC功率的强烈影响。
英文摘要
This work presents an examination of the main interactions between grid-following (GFL) and grid-forming (GFM) voltage source converters (VSCs) and synchronous generators (SGs), capturing the dynamics of a real power grid and pointing out the limitations of considering an ideal one for stability studies. Eigenvalue trajectories and participation factors are studied to perform in-depth small-signal analyses. Specifically, the GFL and GFM converters are compared in different grid strength scenarios by varying their rating powers and the grid short circuit ratio. Then, time-domain simulations of the non-linear and the developed linear systems are run to validate the mathematical findings from the stability analysis. The results reveal that the stability of VSCs-dominated grids, either in GFL or GFM mode, is strongly affected by both the grid strength and the VSC power, due to the coupling between the VSC control and the SGs.
