Abstract: The wind power transmission system is studied based on the method of gear system dynamics. Auto-regressive method is used to simulate wind speed of true wind field, and time-varying input torque of gear transmission system of wind turbine, caused by stochastic wind speed under the actual operation control strategy of the wind turbine is then obtained. A coupling dynamic model of the gear transmission system is built by using lumped-parameter method, the model includes the time-vary mesh stiffness of gear pair, the stiffness of rolling element bearing, the meshing error, etc. Then dynamic differential equation is built on that basis, and natural frequencies, vibration responses, dynamic meshing forces of gears as well as bearing forces of the gear transmission system are obtained by using numerical method. Research results lay a foundation for dynamic performance optimization and reliability design of the gear transmission system of wind turbine.

Key words: Dynamic characteristic, Gear transmission, Operation control, Stochastic wind speed, Wind turbine