考虑气动阻尼效应的输电线路风偏动态分析方法  

Windage yaw dynamic analysis methods for transmission lines considering aerodynamic damping effect

作　　者：楼文娟[1] 杨悦[1] 吕中宾[2] 张少锋[2] 杨伦[1] 

机构地区：[1]浙江大学结构工程研究所,杭州310058 [2]河南电力试验研究院,郑州450052

出　　处：《振动与冲击》2015年第6期24-29,共6页Journal of Vibration and Shock

基　　金：国家电网公司科技项目;国家自然科学基金项目资助(51378468;51178424)

摘　　要：针对连续多跨输电线路在瞬态风场作用下的风偏问题,提出考虑气动阻尼效应的输电线路风偏动态分析方法。以500 k V三跨线路为对象建立精细化非线性动力学计算模型,用谐波叠加法构建整档线路各点脉动风速场并结合准定常假设模拟作用于输电线路的时变风荷载。考察由输电线路自身运动引起的气动阻尼对动态风偏响应影响,讨论其对绝缘子串风偏角频谱影响。采用美国输电线路设计规范ASCE No.74的气动阻尼进行导线风偏计算,并与所提方法比较。结果表明,输电线路气动阻尼对风偏动态响应影响显著,两种考虑气动阻尼方法计算结果较接近。Electrical power transmission systems are severely threatened by flashover accidents caused by windage yaw. Here,a nonlinear dynamic transmission line model consisting of three-span electrical conductors was established precisely by using the finite element method. Then,the fluctuating wind speed field around the transmission line was built with the harmonic wave superposition method and the time-varying wind loads acting on the line were simulated with the quasi-steady assumption. The time and space correlation characteristics between different simulated points were taken into account. Furthermore,the impact of aerodynamic damping caused by conductor movements on the windage yaw dynamic response of the transmission line was investigated. The aerodynamic damping gained with the US transmission line design code ASCE No. 74 was adopted to compute the windage yaw dynamic response of the line. The results of the two methods were compared. It was shown that the aerodynamic damping can reduce the maximum value of the windage yaw dynamic response of the line significantly,but have no remarkable effect on its average value; the results of the two methods are close to each other.

关 键 词：风偏 气动阻尼 多跨线路 瞬态风场 非线性动力分析 

分 类 号：TM75[电气工程—电力系统及自动化]