Study On Vibration And Control Strategy Of Transmission Tower Line Coupling System Under Strong Wind

Transmission tower line system is the carrier of power transmission.It plays an important role in the economic development of the country and the people’s life,and its security issues have attracted much attention.The transmission tower line system is very strong nonlinear coupling system which is composed of insulators,wires and transmission tower.The wind damage and earthquake will lead to the destruction of transmission line tower system.As the main design load and the most common load,wind load may lead to fatigue and damage of transmission tower line system collapse and other disasters.Therefore,the study of the vibration mechanism and control strategy of the transmission tower line system under wind load has theoretical significance and practical application value.In this paper,the ZA1-ZK1 tower in the standardized design of 220 kV transmission line in Jiangsu power grid is taken as the research object,and the related simulation studies are carried out by using ANSYS and MATLAB software.The main works are as follows:1)For the ZA1-ZK1 tower,after proper simplification,ANSYS is used to establish the three-dimensional truss and girder hybrid finite element model of the transmission tower line system,and the modal analysis is carried out.2)Study the mechanical characteristics of the wind field and the calculation of wind load on the transmission tower line.Harmonic synthesis method is used to simulate the wind speed time history based on Davenport power spectrum,and on this basis,the wind load of the transmission tower line system is calculated.3)The shape memory alloy(SMA)was studied and the finite element numerical simulation of the shape memory alloy material was carried out by ANSYS.4)Based on the transient dynamic analysis of ANSYS,the time history dynamic response characteristics of the transmission tower line system are studied.Three different layout schemes for shape memory alloy materials are designed.Then the time history analysis of the tower line system with damping material is carried out,and the displacement and acceleration time history curves are obtained.Compared with the curve of the time without damping material,the damping ratio of different schemes is calculated,and the optimal damping material layout scheme is established.