The increasing use of power electronics converters to integrate renewable energy sources has been subject of concern due to the resonance oscillatory phenomena caused by their interaction with poorly damped AC networks. Early studies are focused to assess the controller influence of a single converter connected to simple networks, and they are no longer representative for existing systems. Lately, studies of multi-infeed grid-connected converters are of particular interest, and their main aim is to apply traditional criteria and identify their difficulties in the stability assessment. An extension of traditional criteria is commonly proposed as a result of these analysis, but they can be burdensome for large and complex power systems. The present work addresses this issue by proposing a simple criterion to assess the stability of large power systems with high-penetration of power converters. The criterion has its origin in the mode analysis and positive-net damping stability criteria, and it addresses the stability in the frequency domain by studying the eigenvalues magnitude and real component of dynamic models in the admittance matrix form. Its effectiveness is tested in two case studies developed in Matlab/Simulink which compare it with traditionally criteria, proving its simplicity.

中文翻译：

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以导纳矩阵形式建模的多馈电并网 VSC 的稳定性评估

越来越多地使用电力电子转换器来集成可再生能源已经成为关注的主题，这是由于它们与阻尼差的交流网络相互作用引起的共振振荡现象。早期研究的重点是评估连接到简单网络的单个转换器的控制器影响，它们不再代表现有系统。最近，对多馈入并网变流器的研究特别令人感兴趣，其主要目的是应用传统标准并确定其在稳定性评估中的困难。作为这些分析的结果，通常建议扩展传统标准，但它们对于大型和复杂的电力系统来说可能是繁重的。目前的工作通过提出一个简单的标准来评估具有高功率转换器渗透率的大型电力系统的稳定性，从而解决了这个问题。该准则起源于模态分析和正净阻尼稳定性准则，它通过研究导纳矩阵形式的动态模型的特征值幅度和实分量来解决频域中的稳定性问题。在 Matlab/Simulink 开发的两个案例研究中测试了其有效性，将其与传统标准进行了比较，证明了其简单性。它通过研究导纳矩阵形式的动态模型的特征值幅度和实分量来解决频域中的稳定性问题。在 Matlab/Simulink 开发的两个案例研究中测试了其有效性，将其与传统标准进行了比较，证明了其简单性。它通过研究导纳矩阵形式的动态模型的特征值幅度和实分量来解决频域中的稳定性问题。在 Matlab/Simulink 开发的两个案例研究中测试了其有效性，将其与传统标准进行了比较，证明了其简单性。