±800kV特高压长江大跨越输电塔风振时域分析  

Analysis of Wind Vibration in Time Domain of Ultra High-voltage ±800kV Changjiang Long Span Transmission Tower

作　　者：甘凤林[1] 杨振伟[1] 李小磊[1] 代晓光[1] 

机构地区：[1]东北电力大学建筑工程学院,吉林吉林132012

出　　处：《华东电力》2010年第2期236-240,共5页East China Electric Power

基　　金：东北电网科技基金项目(2008-371)

摘　　要：以建设中的向家坝—上海±800 kV特高压直流输电线路工程为例,运用脉动风的基本特性和Kaimal风速谱,考虑大跨越特高压输电塔结构体形特征、功率谱能量特性等影响因素,采用在时域中按时间抽取的快速傅立叶变换技术改进的谐波合成法对大跨越输电塔结构的脉动风速时程进行模拟,以通过风振时域分析更全面地了解大跨越输电塔结构的风致响应特性,更直观地反映大跨越输电塔结构风振控制的有效性,通过算例验证了所提思路的正确性和有效性,并研究了脉动风速时程沿高度方向的风振特性、变化规律及其空间相关特性。Taking the undergoing Xiangjiaba-Shanghai ultra high-voltage DC ±800kV transmission line project as an example,based on the basic characteristics of fluctuating wind and Kaimal spectra,considering various factors such as structural style of long span transmission tower,characteristics of power spectral energy,etc,the time-history of fluctuating wind speed of long span transmission tower was simulated by the improved weighted amplitude wave superposition（WAWS） method adopting the decimation-in-time fast Fourier transform（DIT-FFT） technique in time domain,which aimed to gain an insight into the characteristics of wind-induced response of long span transmission tower under wind loads via the time-history analysis,and to display intuitively the effectiveness of wind vibration control of long span transmission tower in the time domain.The correctness and the effectiveness of the proposed method were verified by a case calculation.The wind-induced characteristics,the variation pattern and the spatial correlation characteristics of the time-history of fluctuating wind speed along the height direction were studied.

关 键 词：输电塔 脉动风 卡曼谱 按时间抽取的快速傅立叶变换 

分 类 号：TM753[电气工程—电力系统及自动化]