Derivation of an equivalent circuit for real-time security assessment
Derivation of an equivalent circuit for real-time security assessment
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DOI：
10.1049/iet-gtd.2015.1185
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发表时间：
2016-05
影响因子：
2.5
通讯作者：
G. Wijeweera;U. Annakkage;W. Zhang;A. Rajapakse
中科院分区：
文献类型：
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作者：
G. Wijeweera;U. Annakkage;W. Zhang;A. Rajapakse
利用能量管理系统（EMS）产生的实时潮流模型，真实的实时计算输电能力，已成为越来越多的电力系统运营商关注的问题。然而，与离线研究模型相比，EMS模型通常覆盖互联系统的有限部分。为了捕捉外部系统的影响而扩展EMS模型是不切实际的，因此为此目的使用等效网络变得必要。等效电路可以从离线模型中导出，用于某些预定的操作条件。这种固定的等效模型在各种实时操作条件下可能产生无效结果。因此，有必要推导出一个等效电路模型，是自适应的可用的实时信息。本研究提出了一种新的方法，创建一个基于测量的边界站参数，如电压和潮流的等效电路模型。仿真研究表明，这种推导出的等效电路模型提供的解决方案与详细的离线系统模型相比，具有足够的精度。
More and more system operators are interested in calculating transfer capability in real time using real-time power flow models generated from the energy management system (EMS). However, comparing with off-line study models, EMS models usually cover a limited portion of the interconnected system. It is not practical to extend the EMS model in order to capture the impact of the external systems and as such using an equivalent network becomes necessary for this purpose. Equivalent circuits can be derived from the off-line models for certain pre-determined operating conditions. Such fixed equivalent models may produce invalid results under various real-time operating conditions. Hence, it is necessary to derive an equivalent circuit model that is adaptive to the available real-time information. This study presents a new method of creating an equivalent circuit model based on the measured boundary station parameters such as voltages and power flows. Simulation studies show that such derived equivalent circuit models provide solutions with adequate accuracy in comparison with detailed off-line system model.