Research on the Wind-induced Dynamic Response Analysis Method of the High-voltage Transmission Tower-line System under Strong Wind

Abstract

It has always been a research hotspot in the field of the transmission engineering to research on the stability of high-voltage transmission lines under strong wind and establish effective measures to prevent the wind disaster. Wind disasters such as the structure deformation, tower collapse and line disconnection affect the safety of transmission lines seriously, which trouble the technicians a lot. The long-span, high-flexibility and strong coupling characteristics of the tower-line system itself determine that it is extremely sensitive to external random loads. From the theoretical perspective, effective conclusion of the analysis on the wind-induced response of the tower-line system can be obtained only by following the inherent coupling characteristics of the tower-line system, the spatial distribution correlation of the strong wind in the large field and the probability characteristics of wind-induced response closely, which is also the focus of this paper. A specific 220kV transmission line was chosen as the research object in this paper. First of all, a refined finite element model of the high-voltage tower-line system was established which takes the tower-line coupling factors into account. Then, considering the non-Gaussian and spatial distribution correlation characteristics, a numerical simulation method of the strong wind in large field was provided. On this basis, the comparative analysis of the wind-induced response of the tower-line system was completed and the probability density function of the key mechanical parameters of the tower-line system was established and analyzed finally. The models and methods proposed in this paper are verified to be correct and more close to the actual working conditions, which can provide reference for the study of the transmission line operation, maintenance and wind disaster prevention.