电力信息相互依存网络与单层电网的级联故障比较

Comparison of Cascading Failures Between Power Information Interdependent Networks and Single-Layer Power Grids

电力网络和信息网络深度融合,虽然促进网络间的交流,但也带来故障大规模传播的风险。基于电网结构和负载特性,结合信息网调度功能,构建电力信息相互依存网络模型。使用最高负载、最低负载和最高容量比3种节点攻击方式攻击电网单一节点,并与单层电网故障进行比较。研究表明,在最高负载节点攻击下,初始负载较小时,电力信息相互依存网络的鲁棒性比单层电网弱,当初始负载较大时,两种网络鲁棒性接近;在最低负载和最高容量比节点攻击下,两种网络的鲁棒性差异并不明显;在相互依存网络上,最高负载节点攻击的级联故障最难完全消除。

The deep integration of electricity network and information networks can promote communication between networks,but also brings the risk of large-scale transmission of failures.Based on the grid structure and load characteristics,combined with the dispatching function of information network,we construct a"power-information interdependence network"model.Three types of node attack methods are applied to attack a single node of the power grid where the attacked node is the highest load node,the lowest load node or the highest capacity proportion node.The cascade effects are compared with single-layer power grid.Study shows that the robustness of the power information interdependent network is weaker than that of the single-layer power grid under the highest load node attack when the initial load is small.The robustness of the two kinds of networks approaches each other when the initial load is large.The difference in robustness of the two kinds of networks is not obvious at the lowest load node and highest capacity proportion node attack.On the interdependent network,the cascading failure caused by the highest load node attack is the most difficult to eliminate completely.