基于级联失效的燃气管网节点重要度评估

The important evaluation of gas pipeline network nodes based on cascade failure

针对燃气复杂网络中某个节点失效引起整个系统大规模级联反应的系统脆弱性问题,选取度中心性、介数中心性、紧密度中心性三个指标计算节点拓扑结构中心度,通过移除中心度值较高节点模拟燃气管网重要节点故障演化,建立级联失效模型。以某地天然气中压管网为例,通过模拟目标节点故障引发的其他节点水力失效计算目标节点的级联影响度,综合燃气管网中节点的拓扑结构中心度和级联失效影响度对其重要性进行评估。

Aiming at the systemic vulnerability of large-scale cascade reaction of a whole system caused by the failure of a node in a complex gas network, the centrality of degree, betweenness and closeness were selected as the indexes to calculate the node centrality,and the cascade failure model that simulates the failure evolution of important nodes in a gas network by removing nodes with higher center values was built. Taking a medium-pressure gas pipeline network as an example, cascade influence of the target node was calculated by simulating the hydraulic failure of other nodes caused by the failure of the target node. The importance of the nodes was evaluated by the influence of the centrality of the topology and the influence of cascade failure on the gas pipeline network.