基于电气介数的电网关键环节辨识

在综合考虑电网拓扑结构、功率输送关系和系统运行状态的基础上,提出了一种基于电气介数的电网关键环节的辨识方法,克服了以往加权介数假设"发电-负荷"节点间潮流只沿最短路径流动的缺点。根据线路和节点在系统结构上的差异性,分别定义了线路电气介数和节点电气介数,通过三种故障模式对关键线路和关键节点进行有效性校验。以IEEE39节点系统为例计算其线路电气介数和节点电气介数,并按照排序结果对这些元件进行连锁攻击,发现电力系统在这些高介数元件攻击下是极其脆弱的。仿真结果表明,所提方法能更好地反映元件在整个电网中的重要程度,特别是能识别那些虽承载功率不多但处在电网拓扑结构重要位置的元件,验证了该方法的有效性。

Identification of Key Links in Power System Based on Electrical Betweenness

In consideration of topological structure of power grid,power transport relations and system operating status,propose an identification method for grid key links based on electrical betweenness which overcomes the defects that currents between nodes of weighted betweenness hypothesis "generation-load" only flow along the shortest path.According to the difference of circuit and node in the system structure,the electrical betweenness and the number of nodes are defined respectively,and the validity of the key lines and key nodes is verified by three kinds of failure modes.Taking IEEE39 bus system as an example to calculate the electrical betweenness and node electric betweenness,and conduct chain attack on these elements according to the ranking results,finding that power system for these high betweenness components under attack is extremely fragile.The simulation results show that the importance of the proposed method can better reflect the importance of elements in the whole power system,especially to identify those carrying power though not much but at an important position in the topology of the components,and verifying the validity of the method.