基于非线性结构分析的架空输电线路风致位移响应研究

Research on Wind-induced Displacement Response of Overhead Transmission Lines Based on Nonlinear Structural Analysis

高压输电线路的稳定性和可靠性是影响电网安全稳定运行的重要因素。因此,开展输电塔线体系的风致响应研究,一直是输电工程技术领域的研究热点。以220 kV输电线路为例,进行了脉动风场的数值模拟,分析了塔线体系的振动形态,重点研究了风载荷作用下导线的振动形态以及在不同工况下由导线振动引起的位移变化。深入分析了输电线路的瞬态动力学响应,包括对架空输电线路的模态分析、风载荷下的振动过程以及不同工况下塔线的位移变化。结果表明:铁塔与导线的振动主要为一阶模态、二阶模态低频振动;导线的振动模式主要影响塔线体系的振动,不同时刻下振动位移的最大值对系统安全运行有更严重的影响。研究分析结果对输电线路的防风抗灾、安全稳定运行具有指导意义。

The stability and reliability of high voltage transmission line are important factor affecting the safe and stable operation of power grid.Therefore,the study on wind-induced response of transmission tower line system has been a hot research topic in the field of transmission engineering technology.Taking 220 kV transmission line as an example,we carried out the numerical simulation of pulsating wind field,analyzed the vibration form of tower line system,and focused on the vibration form of wire under wind load,as well as the displacement change caused by the vibration of wire under different working conditions.In addition,we deeply analyzed the transient dynamic response of the transmission line,including the modal analysis of the overhead transmission line,the vibration process under wind load and the displacement change of the tower line under different working conditions.The results show that the vibration of the tower and the wire is mainly the first and second mode low frequency vibration.What’s more,the vibration mode of the wire mainly affects the vibration of the tower and wire system,and the maximum value of the vibration displacement at different times has a more serious impact on the safe operation of the system.The results of the research and analysis have guiding significance for the safe and stable operation of transmission lines.