改进层次分析法在配网线路防雷评估中的应用

Application of Improved Analytic Hierarchy Process on Evaluation of Lightning Protection in Distribution Networks

为了有效减少输电线路雷击事故,确保电力系统的安全,电力运行部门必须采取一定的防雷措施来提高输电线路的耐雷水平.文中基于采用新标度的层次分析法和模糊综合评价法,综合考虑降低跳闸率、工程费用、效果目标、维护难易度、运行寿命等因素的影响,构建了一个适用于配电网的防雷措施评估模型,并对实际线路防雷措施进行评估.根据层次分析法得到各防雷措施相对于目标层的权重值,然后采用模糊综合评价法得到各改造方案的隶属度,从而确定线路最优化的改造方案.结果表明,该评估系统能够有效地对配电线路进行评估,确定配电线路最优防雷措施及线路改造方案.

In order to effectivelyreduce thelightning incidents of power transmission lines and ensure the safety of power systems,some measures should be adopted to improve the lightning withstand level of transmission lines. In this paper,based on an improved analytic hierarchy process( AHP) with new scale and the fuzzy comprehensive evaluation method( FCEM),a model suitable for evaluating the lightning protection measures of actual lines in power distribution networks is proposed,which comprehensively considerssuch factors as the reduction of trip-out rate,the impact of engineering cost,the effect of the target,the ease of maintenance andthe service life. Then,in accordance with the AHP,all the evaluation weights of lightning protection measures relative to the destination level are obtained,the memberships of the measures are determined via the FECM,and the optimal rehabilitation scheme is thus presented. The results show that the proposed evaluation system helps to effectively assess the power distribution lines and determine the optimal lightning protection measures as well as line rehabilitation scheme.