基于加权潮流转移熵的电网脆弱线路辨识

为了辨识电力系统的脆弱线路,本文基于熵理论对现有的潮流转移熵模型做了改进,提出基于加权潮流转移熵的支路脆弱性评估指标,该指标在衡量转移潮流分布的不均衡性时综合考虑线路的负载率,克服了以往模型忽视支路本身属性差异的不足;再结合线路的电气介数,提出一种新的支路综合脆弱性评估模型。该模型从线路之间相互作用的动态过程和电网拓扑结构两个角度综合评估线路的脆弱度。通过对IEEE 39节点系统的仿真分析,可以发现本文提出的方法能够有效克服从单一角度辨识脆弱线路,验证了所提模型的正确性和合理性。

Vulnerable Lines Identification of Power Grid Based on Weighted Transfer Entropy of Power Flow

In order to identify the vulnerable lines in power grid, the transfer entropy model is improved based on entropy theory. A branch vulnerability index based on weighted transfer entropy of power flow is proposed. This index takes line load rate into consideration to overcome the deficiency of previous models, which ignore the different properties of each branch, when measuring the distribution of the transfer power flow. A new branch integrative vulnerability assessment model is then proposed by combining with line electrical betweenness. This model makes a comprehensive evaluation to the vulnerability of lines from two perspectives: the dynamic process of interactions between lines and the Topology of distribution network. Through the simulation analysis of IEEE 39-bus system case, the proposed method can effectively overcome the perspective of a single network vulnerability assessment, verify the correctness and rationality of the proposed model.