Effect of inertia heterogeneity on frequency dynamics of low-inertia power systems
Effect of inertia heterogeneity on frequency dynamics of low-inertia power systems
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DOI：
10.1049/iet-gtd.2018.6814
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发表时间：
2019-07-23
影响因子：
2.5
通讯作者：
Mancarella, Pierluigi
中科院分区：
文献类型：
--
作者：
Adrees, Atia;Milanovic, J. V.;Mancarella, Pierluigi
基于基本的动态仿真原理和说明性案例研究，本研究旨在识别由于可再生能源（RES）的高渗透率影响频率动态而导致的系统动态行为的关键变化，并为在具有大渗透率的低惯性电力系统中进行频率稳定性分析提供指导。给出了利用系统等效模型和详细动态模型获得的有功功率扰动后的频率响应的关键比较。然后证明，使用详细的动态模型的两个多区域系统，这样，当RES的比例占主导地位的份额的同步发电机（SG），区域之间的动态耦合（即使分离的短，中等长度的线路）减少和系统的惯性应被视为异构的，而不是一个全局参数。在此之后，该研究讨论了如何频率动态可能会强烈和复杂的物理特性的转换器连接的发电导致增加频率和电压的相互作用时，转换器连接的RES的比例变得大于SG的影响。由于频率和电压的相互作用而导致的系统动态行为的变化可能会在可靠的意外事故之后增加实际有功功率不平衡大小，因此应仔细考虑保护系统免受过高频率变化率的影响。为了评估系统动态行为变化的程度，应使用适当的网络动态模型，并充分表示RES和负荷的多区域。
Based on fundamental dynamic simulation principles and illustrative case studies, this study aims to identify key changes in the dynamic behaviour of the system due to the high penetration of renewable energy sources (RES) affecting frequency dynamics and provide guidelines for performing frequency stability analysis in low-inertia power systems with a large penetration of RES. First, a critical comparison of the frequency responses obtained using a system equivalent model and a detailed dynamic model following an active power disturbance are presented. It is then demonstrated, using detailed dynamic models of two multi-area systems, such that when the proportion of RES prevails over the share of synchronous generator (SG), the dynamic coupling among areas (even separated by short-medium length lines) reduces and the inertia of the system should be considered as heterogeneous instead of a global parameter. Following this, the study discusses how frequency dynamics may be strongly and complexly affected by the physical characteristics of converter-connected generation leading to increased frequency and voltage interactions when the proportion of converter connected RES becomes greater than SG. The resulting changes in the system's dynamic behaviour due to frequency and voltage interactions can increase the actual active power imbalance size following a credible contingency so that careful considerations to protect the system against an excessively high rate of change of frequency should be made. In order to evaluate the extent of this change in system dynamic behaviour, an appropriate dynamic model of the network should be used with adequate multi-area representation of RES and loads.