基于潮流冲击熵的加权拓扑模型在电网脆弱性辨识中的应用

电网脆弱性不仅与电网的拓扑结构有关,还与电网的电气特征紧密相连。为了辨识出电网的脆弱环节,基于支路开断的潮流冲击熵,提出了一种电网脆弱性辨识的新方法。定义了支路和节点脆弱强度指标,建立了基于潮流冲击熵的加权拓扑模型,由此得出了线路和节点的加权介数指标,结合脆弱强度和介数指标,提出了综合脆弱度指标,该指标综合考虑了电网拓扑结构与电气特征的影响,且加权介数的引入能够对电网脆弱性进行辨识起到放大的作用。由算例结果可以发现,文中定义的综合脆弱度指标能够有效克服从单一角度对电网进行脆弱度评估,提高了辨识的准确度与精度,说明了该脆弱性辨识方法的有效性与合理性。

The weighted topology model based on impact entropy of power flow in the application of the grid vulnerability identification

Network vulnerability is not only associated with the topological structure of power grid, is also closely related to the electrical characteristics of the grid.In order to identify the weak link of power grid, based on the branch open circuit the trend of the entropy, this paper puts forward a new method for power grid vulnerability identification. This article defines the branch and node weak intensity index and established the weighted topology model based on impact entropy of power flow, thus it is concluded that the branch and node weighted index of betweenness, combined with weak strength and weighted index of betweenness, puts forward the comprehensive vulnerability index, which considers the influence of grid topology structure and electrical characteristics, and the introduction of the weighted betweenness can have the effect of amplification to the identification of grid vulnerability.Results can be found by an example,the comprehensive vulnerability index this paper defines can effectively overcome from the perspective of a single network vulnerability assessment, improve the accuracy and precision of the identification, illustrates the validity and rationality of vulnerability identification method.