Wind-induced Vibration Control Of Substation Frame Based On Viscous Damper

Power resources are important people's living resources and national strategic resources.They play an important role in people's livelihood and the development of the country.To ensure the efficient transportation and rational distribution of power resources,more and more power transmission and transformation projects have been established.Because of its high structure,large span and large flexibility,the electric frame is a typical wind-sensitive structure.It will undergo large deformation under dynamic wind load,and the larger deformation will be safe and variable for transmission lines.The safety of the structure itself has a relatively unfavorable influence.Some previous studies mainly focused on the wind direction angle and wind vibration coefficient of the substation structure,and achieved certain results.Based on the previous research,this paper first proposed the application of viscous damping.The idea of wind-induced vibration control of the structure is intended to reduce the occurrence of disconnection and ensure the safety of the structure itself.In this paper,the numerical simulation of wind load,wind-induced vibration response of tower tower structure and structural wind-induced vibration control measures are reviewed.The wind load numerical simulation method and specific simulation details are used in this paper.Demonstration.Secondly,in order to study the effect of viscous damper on wind-induced vibration control of large-scale substation frame,this paper takes a 1000 kV large-scale substation structure in western Inner Mongolia as an example,uses SAP2000 finite element software to carry out fine structure modeling,and uses harmonics based on Matlab software.The superposition method simulates the time-course samples of multi-segment dynamic wind loads,and adds the time-history load to the corresponding nodes.Then the modal analysis of the structure and the wind-induced response analysis under dynamic wind are carried out,and the dynamic characteristics and structure of the structure are discussed in depth.The response characteristics of each lattice tower and the response characteristics of each lattice beam under the action of 45°wind direction angular wind.Thirdly,this paper designs six kinds of viscous damper arrangement schemes,with the displacement and acceleration of typical nodes as the wind vibration control indicators.The wind vibration control effects of each scheme under different damping parameters are compared,and the damping parameters are analyzed for each layout scheme.The results show that the scheme of setting the viscous damper in the lower layer of the substation and setting the viscous damper between the ground column and the lattice beam is a comprehensive optimal scheme;and the wind turbine control effect of the optimal scheme is The viscous damper parameters are sensitive,and the control effect is not linearly increased with the increase of damping index and damping coefficient.Corresponding to different damping indexes,the damping coefficient has a better value range.Then,the wind-induced vibration control effect of the structure is selected when the optimal control scheme selects the optimal damping parameters.Finally,the main work of the thesis is summarized,and the main conclusions of this paper are drawn.Combined with the current research status,the wind-induced vibration control measures of the substation structure are further prospected.