Numerical Simulation Of Wind-Induced Vibration Of Transmission Line And Comparison Of Wind Load

With the rapid development of China’s economy,China’s power industry has been rapid development,500 kV and above transmission lines gradually become the backbone of China’s power grid.What’s more,the construction of the project that "Southern Power North" and "West to East" has been going on.At the same time,the cumulative collapse of the UHV lines of 500 kv and above and the damage caused by the typhoon to the coastal power grid have also occurred,leading to large-scale power outages,affecting the production of life and causing huge economic losses.It is reasonable to find out the weak points of windbreak in the established transmission lines and line design and correctly evaluate the test of the power transmission tower to cope with the wind disaster.That carry out the research on the wind power defense of the power system in order to improve the safety of the power system under the strong wind disaster and ensure the power supply is an urgent task and challenge for the current power system.Therefore,the importance of the safety design of the transmission tower structure is worth more and more attention,which is significant for the reasonable calculation of the wind load and the wind vibration coefficient of the transmission tower.(1)The random wind field is reconstructed by means of wind speed simulation.The finite element dynamic numerical simulation of the fluid-solid coupling nonlinearity of the transmission conductor and the tower is carried out which is based on quasi-constant aerodynamic assumptions.The dynamic time course of the corresponding response is obtained of 14 wire conditions and 21 towers conditions on account of the actual line of the object project.(2)For the transmission wire,the aid is that compare the norms in China with the current international norms in the basic wind speed,wind load calculation method and the standard value.The wind-induced vibration coefficients of wind loads with different span and different wind speeds are analyzed emphatically.(3)For the transmission tower,the aid is that compare the norms in China with the current international norms in the wind load calculation method,the wind load body coefficient,wind vibration coefficient and the standard value.The wind-induced vibration coefficients of wind loads with different towers and towers of different height are analyzed emphatically.And four different height of towers were calculated and compared.