一种综合潮流追踪和链接分析的电力系统关键节点识别方法

摘要

将一种基于链接分析的思路应用于电力系统安全评估,结合潮流追踪技术提出一种考虑系统运行状态的关键节点识别方法.基于潮流追踪结果定义了系统节点链接强度以及负荷重要性评价的新指标,并利用系统链接强度同时考虑系统实际潮流方向建立了电网的加权有向图.借鉴基于链接分析的PageRank算法思路,建立了基于电网加权有向图链接强度的节点重要度计算评价模型,实现了关键节点的有效识别.所提出的识别方法可基于系统当前实际网络结构和潮流分布,从电网全局能量传输的角度,识别出对系统安全运行起关键作用的重要节点.利用IEEE39节点系统作为算例对所提出的关键节点识别方法进行了验证,并通过与已有的关键节点识别方法进行比较,表明该方法所得到辨识结果更加符合电力系统的运行实际.%A kind of link analysis sorting method is applied to power system security assessment.A critical node identification method combined with power tracing technique is proposed.Based on result of the power trace,a new index of system node link strength and evaluation of load importance is defined.Power grid weighted directed graph is established by utilizing system node link strength with system actual power flow direction.Inspired by the idea of Pagerank Algorithm based on link analysis,the computational model of node importance evaluation based on power grid weighted directed graph is established and the critical node effective identification is realized.The proposed identification method bases on the system actual grid topology and power flow distribution,from the view of the global grid energy transmission to identify the key node of system safe operation.The proposed method is verified by taking IEEE-39 system as an example and compared with the existing method.The verification result indicates that this method is more consistent with the system actual operation state.