台风作用下输电塔线体系多元状态监测及风偏可靠度分析

Multi-variate state monitoring and wind bias reliability analysis of a transmission tower-line system under action of typhoon

在舟山某输电线路上布设一套包含风速风向等气象要素以及塔线动力响应的多元状态监测系统。该监测系统获取了在2017年18号台风“泰利”影响下的输电塔线周边风场,导线风致振动以及动张力等现场实测数据。考虑结构参数的不确定性,建立了该输电线路有限元模型,开展了本次台风以及不同风灾水平下的导线风振反演分析,其中脉动风场是在数值模拟生成的基础上再与现场实测风速数据同化后得到。本次台风作用下的反演分析结果与实测值吻合较好,验证了随机风振反演分析结果的有效性。根据风偏响应结果,进一步完成了该输电线路可靠度分析,得到了风偏闪络失效的易损性曲线,从而评估了该输电线路在不同风灾作用下的风偏闪络危险程度。

An on-line multi-variate state monitoring system containing wind velocity,wind direction and tower-line dynamic response,etc.was arranged on a transmission tower-line system located in Zhoushan,Zhejiang province.This monitoring system gained the actual measured data including wind field around the transmission tower,the line wind-induced vibration response and dynamic tension under 18#Typhoon Talim in 2017.Considering the uncertainty of structural parameters,the finite element model for the tower-line system was established to perform the inversion analysis of the line wind-induced vibration under typhoon Talim and different levels of other wind disasters.In the inversion analysis,the fluctuation wind field was obtained based on numerical simulation and assimilation with the measured wind velocity data.The inversion analysis results under typhoon Talim agreed better with the actual measured data to verify the effectiveness of the results of the stochastic wind-induced vibration inversion analysis.According to the results of wind bias response,the reliability analysis of the tower-line system was completed to gain its fragility curve of wind flashover failure,and estimate this tower-line system’s risk degree of wind flashover under action of different wind disasters.