Wind-induced Response And Vibration Control Of Long-span Transmission System

Many disasters caused by wind and earthquake make us believe that if the transmission system is destroyed, it will hurt power system and affect people's life. As a result, it maybe draws fire disaster and brings great loss to the property. How to ensure the transmission system works normally under any condition is an important study subject in the electric power field and civil engineering field, In sum, it causes much attention from researchers around the world.In this paper, based on the Xiangjiang 500kV transmission system between Gangshi and Changsha, the dynamic response of the transmission system subjected to wind load is discussed. Use two different kinds of model to simplify the coupled system and analyze the dynamic character of the transmission system. With the erection of the controller system, the wind-induced response is reduced and the security and reliability are improved. This paper including:1. Based on previous academic references, present a multi-degree-freedom structural model, in which the transmission lines are composed of numbers of concentrated mass combined by rigid bars. This model cannot only simplify calculation but also has a good precision. Some factors that probably influence the calculating precision of the model are analyzed by using ANS YS software.2. A new cable model is erected aiming at the transmission lines and the correctness of the model is proved by example. In addition, based on iterative method, a program is compiled to ensure the accuracy of the initial coordinate of the transmission lines. After this, the dynamic character of the transmission lines is calculated. Then the truss-cable model with the consideration of insulators is adopted to analyze the transmission system.3. Use triangle series method to simulate the pulse wind acted on the transmission system. Then analyze the lifeline project by using the time history method to obtain all dynamic responses of the system subjected to wind load.4. Use ANSYS APDL to construct the static and dynamic analysis system of the transmission tower.5. After detailed parametric studies of the passive friction damper in vibration reduction of Xiangjiang tower, this paper analyzes several important factorswhich greatly affect the damper's vibration abating performance and draws some valuable conclusions for design of friction dampers. It is shown from the study of this paper that, as simple and cheap energy dissipating devices, friction dampers of optimal parameters and located at appropriate positions can significantly enhance wind-resistant performance of high-rise tower.