The increase proportion of power converters causes stability problems in the radial grid. To address these issues, this paper firstly proposes a unified modeling procedure and applies it to two types of converters. Secondly, the impedance models are used to analyze the stability of a radial grid with converters under four cases. The influence of the short circuit ratio (SCR) and line impedance on system stability are investigated. Then, a comprehensive sensitivity analysis is performed in order to investigate the effects of parameters variations on the closed-loop poles of the system under different conditions. Finally, the accuracy of the model and theoretical analysis are verified by simulations and Hardware-in-the-Loop (HiL) tests.

中文翻译：

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具有功率转换器的径向电网的稳定性评估


功率变流器比例的增加导致径向电网的稳定性问题。为了解决这些问题，本文首先提出了一种统一的建模程序并将其应用于两种类型的转换器。其次，利用阻抗模型分析了四种情况下带有变流器的径向电网的稳定性。研究了短路比（SCR）和线路阻抗对系统稳定性的影响。然后，进行全面的灵敏度分析，以研究不同条件下参数变化对系统闭环极点的影响。最后，通过仿真和硬件在环（HiL）测试验证了模型和理论分析的准确性。