中文摘要：

输电线路脆弱性评估是电网脆弱性研究的重要内容,现有评价方法评价角度单一,且无法考虑天气因素的影响,缺乏实用性,为此,提出了一种评估输电线路脆弱性的新方法。基于加权介数模型,计算线路加权介数指标,基于w ell-being风险追踪模型,计算考虑元件敏感度的w ell-being风险贡献度指标。同时,结合两状态天气模型,研究了恶劣天气对线路脆弱性的影响。结合线路介数和well-being风险贡献度提出了兼顾系统网络结构和运行状态特性的综合脆弱性指标,并给出了输电线路脆弱性评估方法流程。最后对IEEE-RTS系统进行仿真,结果证明了所提指标和方法的合理性和实用性,该方法可以辨识出处于电网关键输电通道上的脆弱线路,为电网运行维护提供参考。

英文摘要：

Vulnerability assessment of transmission line is an important part of the vulnerability researches of power system.The existing methods have problems such as single point of evaluation and lack of practicality,meanwhile cannot consider the impact of weather factors. Therefore,a new assessment method of transmission line vulnerability was proposed. The weighted betweenness indicators of lines were calculated based on the weighted betweenness model. Based the well-being risk tracking model,the well-being risk contribution degree indicators were proposed with considering the component sensitivity. At the same time,combining two-state weather model,the influence of bad weather on the line vulnerability was studied. The integrative vulnerability indicator considering system network structure and running state characteristics was put forward in combination with well-being risk contribution degree and line betweennes,and the process of vulnerability assessment for transmission line was presented. Finally,the rationality and practicability of the proposed method were demonstrated by the evaluation of the vulnerable lines of IEEE-RTS system. The proposed method can identify the vulnerable line in the critical transmission line channel of power grid,which can provide a reference for the operation and maintenance of power system.