The power grid was described a complex network composed of nodes and lines and its vulnerability was analyzed through discussing both nodes and lines' fragility;and employing electrical degree-betweenness index and triple electrical index to assess the vulnerability of nodes and lines in the power grid was proposed. In the IEEE-118 bus system, the cascading failure simulation and global efficiency were implemented to meas-ure the power grid' s vulnerability index.The fault simulation results show that protecting the nodes with higher triple electrical index and the lines with higher electrical degree-betweenness index can ensure safe and steady operation of the power grid.%把电网看成是由节点和线路组成的复杂网络,分别通过节点和线路的脆弱性来分析电网的脆弱性. 提出用电气度介数指标和电气三重数指标来评价线路的脆弱性和节点的脆弱性. 在IEEE-118总线系统中采用联锁故障模拟,用全局效能来衡量电网的脆弱性. 仿真结果表明:保护电气三重数指标高的节点和电气度介数指标高的线路可以有效保障电网的安全稳定工作.
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