南方电网结构脆弱性指标的评判研究

Research on Structure Vulnerability Index Assessment in CSG

基于复杂网络理论构建了南方五省220 kV及以上电压等级电网的无权无向和有权无向网络模型,通过对南方电网的拓扑特征参数进行计算与分析,证明了南方电网的拓扑结构具有小世界网络和无标度的特点;在传统度数和介数指标的基础上提出了点权度和点权介数指标,通过对南方电网中的节点和边蓄意攻击后的脆弱性计算,分析评价了不同指标下南方电网的网络性能。结果表明点权度和点权介数在关键节点的判断上优于度数和介数指标,有权无向网络模型在关键节点的判断上优于无向无权网络模型。该结果与实际电网结构相符,验证了所设指标的合理性。

Unweighted and undirected network model and weighted and undirected network model are built for 220 kV-and-above power networks of five provinces in China on the basis of complex network model. By calculation and analysis on characteristic parameter of topology of CSG, it is proved that topological structure of CSG is characterized by small-world networks and scale-free networks. On the basis of traditional degree and betweenness index, the paper proposes point weight degree and point weight betweenness index. By calculation on vulnerability of node and edge in CSG in case of malicious attack, the paper analyzes and evaluates network performance of CSG in different indexes. The result indicates that point weighted degree and point weighted betweenness is superior to degree and betweenness index in determining key nodes, and weighted and undirected network model is superior to unweighted and undirected network model in determining key nodes, which is in conformity with grid structure and verifies reasonableness of pre-set index.