基于熵权-层次分析法综合指标的电网关键线路辨识

Key Lines Identification in Power Grid Based on Comprehensive Index Calculated by the Entropy Weight-Analytical Hierarchy Process

为准确辨识电网关键线路,首先从电网状态角度考虑,计及电网节点类型与线路负载率,基于泰尔熵理论提出电压变化量泰尔熵和潮流变化量泰尔熵;然后为使评估结果更符合复杂网络与实际电网结构模型,提出最大流传输贡献介数和平均接近中心性指标;最后结合熵权法和层次分析法对指标进行权重分配,得到既兼顾电网状态变化和电网拓扑结构,又结合客观数据并考虑主观经验的关键线路评估综合指标。通过IEEE 39节点标准系统进行测试,验证该综合指标的可行性和实用性。

In order to accurately identify the key lines of the power grid,the paper firstly proposes the Theil entropy of voltage variation and power flow variation based on the Theil entropy theory,in view of the state of the power grid and with consideration of the types of grid nodes and line load rate.The maximum flow contribution betweenness and average closeness index is proposed,so as to make the evaluation results more consistent with the complex network and the actual grid structure model.the entropy weight method and the analytic hierarchy process are used to determine the weight of indexes,and the comprehensive evaluation index of the key lines are obtained,which not only takes into account the changes of the power grid state and the power grid structure,but also the objective data and subjective experience.The feasibility and practicability of the proposed comprehensive index are verified through the IEEE 39-bus system.