摘要
为有效预防大规模连锁故障的发生,提出了一种基于综合指标的脆弱线路辨识方法。首先对支路分布开断因子进行修正,并考虑潮流转移方向的影响,提出支路开断脆弱度以反映线路的开断脆弱性;然后针对传统介数指标的不足,结合功率传输分布因子的定义对其进行改进,构建传输介数指标以反映线路的波动脆弱性。将两者结合作为辨识脆弱线路的综合指标,采用理想解法(TOPSIS)对线路脆弱程度进行排序,筛选出系统中的脆弱线路。最后通过新英格兰39节点系统进行仿真验证,采用蒙特卡洛随机模拟的方式对所选线路进行攻击,计算功率分散水平以反映系统安全性的变化情况,与相关文献进行对比,对比结果证明了所选线路的脆弱性及辨识结果的合理性。
In order to prevent large-scale cascading outages effectively,a method based on comprehensive indicators to identify vulnerable lines was proposed.First,the branch removal distribution factor was modified,and the influence of power flow transferring direction was considered,so the branch removal vulnerability was proposed to reflect the removal vulnerability of the branch.Then,in view of the shortage of traditional betweenness,it was improved by the definition of power transmission distribution factor,and the transferring betweenness was constructed to reflect the fluctuation vulnerability of the line.By combining them as a comprehensive index to identify vulnerable lines,TOPSIS was utilized to rank the vulnerability of the lines,so as to screen out the vulnerable lines from the grid.Finally,with the New England 39-node system,Monte Carlo random simulation method was used to attack the selected lines,and the power dispersion level was calculated to reflect the change of the system safety.Compared with the related literature,the vulnerability of the selected lines and the rationality of the identification results are proved.
引文
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