基于负荷介数和电气欧拉距离的电网关键环节辨识

Load Betweenness and Electric Euclidean Distance Based Identification of Critical Links in Power Grid

为有效辨识电网关键环节,预防连锁故障,本文提出负荷介数和电气欧拉距离作为关键节点和线路的辨识依据。首先考虑电网中节点和线路的差异性提出负荷介数;然后结合线路介数和最大传输功率提出电气欧拉距离。该方法考虑线节点全局重要度、线路加权介数、线路度平均值以及最大传输功率对电网潮流分布的影响,将电网作为有向加权网络处理,计及电网节点度分布的差异性和线路功率传输约束,符合电力系统实际应用。通过IEEE 39节点系统的仿真计算和已有方法的对比,验证了本文所提方法的有效性。

To effectively identify the critical links in power grid and prevent cascading failures,load betweenness and electric Euclidean distance are proposed to identify the critical nodes and lines in power grid. Firstly ,load betweenness is proposed by considering the distinction between nodes and lines. Then synthesizing the line betweenness and maximum transmission capability of lines,electric Euclidean distance is proposed. Considering the influence of global importance of nodes,and weighted betweenness,average degree and maximum transmission capability of lines on the power flow distribution,power grid is simplified as directed and weighted network with the constraints of node degree difference and power transmission,which is in accordance with the applications of power system. Simulation results on IEEE 39-bus system and comparison with other identification methods indicate the effectiveness of the model.