基于Ansys的高压输电塔风振特性分析

在电力大范围应用的背景下,研究输电线路的振动特性对电网整体的安全性有着极其重要的意义。本文推导了三线两塔耦合系统的力学简化模型,并以建立典型的500kV交流双回路耐张塔为对象验证了算法的正确性。利用Ansys软件建立了两塔三线的耦合模型并进行了单塔振动分析、塔—线耦合振动分析。在此基础上利用Davenport风速谱对电力塔模型节点的风载荷进行了模拟,并对耦合模型进行了动力时程分析,最终得到了节点位移曲线,验证了模型的合理有效性。最终结果表明耦合体系的振型以塔、线各自的振型为主,并出现了一部分由塔或线诱发的新振型,且同阶下耦合的振动频率要小于单塔的振动频率。最终经过理论计算与有限元分析结果的比较,证明了所推导力学模型的正确性。

Analysis of wind-induced response and wind-resistant performance of high-voltage transmission tower - line coupling system on Ansys

In power under the background of a wide range of applications, the vibration characteristics of the transmission line for the safety of power grid as a whole has a very important significance. Coupling system is developed, with the three lines of two towers of simplified mechanical model, and to build a typical 500 kv ac double circuit tension tower as the object to verify the validity of the algorithm. Two tower is established by use of Ansys software, three line coupling model analysis, tower and double tower vibration - line coupling vibration analysis. On the basis of the use of Davenport wind speed spectrum to the wind load of the power tower model node is simulated, and the coupling model for the dynamic time history analysis, finally got the node displacement curve, effectiveness of the model is proved reasonable. The final results show that the modal coupling system with tower, the line of their respective modes is given priority to, and a part of vibration induced by the tower or line new type, and under the same order coupled vibration frequency is less than the vibration of the double frequency. Finally through the comparison of theoretical calculation and finite element analysis results, proved the correctness of the mechanical model is derived.