变电站引下线体系时域非线性风振分析  

Nonlinear wind-induced response analysis of substation lead-down system in time domain

作　　者：余国庆 晏致涛 王欣欣 刘欣鹏 YU Guoqing;YAN Zhitao;WANG Xinxin;LIU Xinpeng(School of Civil Engineering,Chongqing University,Chongqing 400044,P.R.China;Department of Civil Engineering and Architecture,Chongqing University of Science&Technology,Chongqing 401331,P.R.China;Electric Power Research Institute of Xinjiang Electric Power Company,Urumqi 830011,P.R.China)

机构地区：[1]重庆大学土木工程学院,重庆400044 [2]重庆科技学院建筑工程学院,重庆401331 [3]国网新疆电力公司电力科学研究院,乌鲁木齐830011

出　　处：《重庆大学学报》2023年第10期107-117,共11页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(52178458,51778097);重庆市科委自然科学基金资助项目(CSTB2022NSCQ-MSX0363)。

摘　　要：变电站引下线结构体系一般为分裂导线,且具有跨度小、高差大、线长短、上下连接的特点,强风引起的事故时有发生。为研究风荷载作用下引下线的非线性风振响应特性,利用AR模型法对脉动风荷载进行模拟,对引下线柔性体系进行模态分析和风振响应时程分析,研究了气动阻尼、风向角、跨高比、间隔棒数量等参数对风振响应的影响。结果表明,引下线体系响应有着明显的非高斯性。与常规水平大跨越输电线相比,其固有频率较高,气动阻尼影响较小。平面内风荷载会导致较大的反力响应,平面外风荷载会导致较大的位移响应;跨高比的增加会导致结构的反力响应增大,而位移响应减小。结构跨中位移响应均随着间隔棒数量增加而减少;而结构的端部反力在间隔棒数量为5时最小。引下线内力响应风振系数和位移响应风振系数并不一致,随跨度增大,风振系数呈减小趋势。Substation lead-down structure system typically consists of bundled conductors and exhibits characteristics such as a small span,significant height difference,short length,and upper and lower connections.Substation lead-down accidents caused by strong winds are frequent occurrences.To study the nonlinear wind-induced response characteristics of the lead-down line under wind loads,the Auto-Regressive model method is used to simulate fluctuating wind loads.Modal analysis and time history analysis are carried out to examine the wind-induced responses of the flexible lead-down system.The effects of aerodynamic damping,wind direction,span-to-height ratio and the number of spacers on wind-induced vibration responses are studied.The analysis shows that the lead-down system’s response exhibits distinct non-Gaussian characteristics.Compared with conventional horizontal long-span transmission lines,the lead-down line exhibits a higher natural frequency and reduced sensitivity to aerodynamic damping.Wind loads in the plane result in larger reaction responses,while out-of-plane wind loads lead to greater displacement responses.An increased span-to-height ratio corresponds to heightened reaction responses and diminished displacement responses of the structure.The mid-span displacement response of the structure increases as the number of spacers decreases,with the smallest reaction response occurring when there are five spacers.Additionally,the wind vibration coefficient for internal force response and displacement response of the down lead varies.As the span increases,the wind vibration coefficient shows a decreasing trend.

关 键 词：引下线 非高斯性 风振响应 响应风振系数 时域 

分 类 号：TU312[建筑科学—结构工程] TM63[电气工程—电力系统及自动化]