基于组合赋权法的输电线路脆弱性评估

摘要

在电网连锁故障分析中,需要甄别出连锁故障传播过程中关键脆弱线路.首先,在考虑了系统网络结构和实时运行状态的基础上,构建了包含电压偏移量、潮流系数、电气介数的指标体系;然后,综合线路的客观数据信息和主观专家意见,进而提出了一种输电线路脆弱度评估方法.算例结果表明,所提指标能够弥补已有指标无法兼顾电网结构和运行状态的不足,评估方法具有较好的实用性.%To study the mechanism of cascading failures in a power grid,it is necessary to find out the key vulnerable lines propagating cascading failures. Firstly,an index system that contains voltage deviation,power flow coefficient and electric betweenness is built,considering the network structure and the real-time operation state of the system. Then, the objective data and subjective opinion of experts are combined,and a line vulnerability assessment method is pro-posed. Numerical example results show that the proposed indexes can overcome the deficiency of the existing ones that do not take the states of the grid structure and operation into account,which proves the feasibility of the assessment method.