连续多跨输电线路动态风偏特征及计算模型

doi:10.3969/j.issn.1000-7229.2015.02.001

摘要/Abstract

摘要：

以500 kV某耐张段8跨线路为研究对象，考虑支座相对高差、绝缘子串长度、几何非线性效应和风致气动阻尼等因素的影响，建立了整个耐张段8跨导线有限元模型。运用谐波叠加法并考虑空间相关性，模拟沿导线各点的脉动风速，研究多跨线路动态风偏响应。通过分析绝缘子挂点风偏响应的功率谱，从共振项和背景项2个方面研究脉动风速对风偏动力放大效应的影响机制。最后比较了多跨线路有限元计算模型和静力单摆模型风偏计算结果。结果表明：（1）静力学单摆模型求得的静态风偏角大于多跨线路连续模型的计算值；（2）考虑气动阻尼效应后，风偏动态响应以背景项为主而共振项可以忽略，相应的动力放大因子为1.1～1.3。

关键词: 风偏响应, 单摆模型, 连续多跨模型, 脉动风速, 动态分析

Abstract:

Taking eight-span 500 kV transmission lines as research object, this paper constructed the finite element model for eight-span conductors in strain section, with considering influence factors, such as the relative height difference of supporter, the length of insulator string, geometric nonlinear effect, wind-induced aerodynamic damping, etc. The harmonic wave superstition method was used to simulate the turbulent wind velocity along the conductor and study the response of conductor swinging in multi-span lines, with considering spatial correlation. Through the analysis on the power spectrum of wind-induced oscillation at insulator suspension point, this paper discussed the impact of turbulent wind velocity on the wind-induced dynamic amplification effect from aspects of background component and resonant component, and compared the conductor swinging calculation results between the multi-span finite element model and the static single pendulum model. The results show that the static rotation angle calculated by the static single pendulum model is larger than that calculated by the continuous multi-span model； when taking aerodynamic damping effect into consideration, the background component is the main body in wind dynamic response, and the resonance component can be ignored； the dynamic magnification factor is about 1.1~1.3.

Key words: response of conductor swinging, single pendulum model, continuous multi-span model, turbulent wind velocity, dynamic analysis

楼文娟，杨悦，卢明，吕中宾. 连续多跨输电线路动态风偏特征及计算模型[J]. 电力建设, 2015, 36(2): 1-8.

LOU Wenjuan, YANG Yue, LU Ming， LYU Zhongbin. Conductor Swinging Dynamic Characteristic and Calculation Model of Continuous Multi-Span Transmission Line[J]. ELECTRIC POWER CONSTRUCTION, 2015, 36(2): 1-8.

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