Vibration Analysis And Damping Control For Wind Turbines

Energy is related to the development of national economy, it is an important problem of the current human survival and development which needs to be solved urgently. Wind power is one of the most potential new energy, due to its cleanness, large capacity, short time of the construction period, and good economic benefit and social benefit, it has been paid high attention by world.For the moment, capacity of large-scale is the development trend of global energy technologies, and the diameter of the rotor and the height of the tower for domestic large-scale wind turbines are either sixty to seventy meters or more. In order to guarantee the working security in the variational wind, vibration stability problem is one of the key technologies which must be solved in the development.Therefore, this dissertation first studies the overall control strategies of the wind turbine, then in purpose of solving the problem of oscillation, analyzes the vibration sources of the wind turbine. According to the main vibration points of the wind turbine analyzed by Campell diagram, such as the distortion vibration of the drive train and the coupled vibration problem of the rotor and tower, the dissertation puts forward the optimization control strategies that adopts damp filter to reduce the vibration load. Based on a lot of research and consulting relevant information, and relying on the SANY electrical Co., LTD of 1.5MW and 2.0 MW wind turbine generators, the article proposes the methods which suppress the distortion vibration of the drive train by adding the frequency of damping in torque control; while on the pitch angle control, a tiny perturbation damping is introduced to reduce the vibration of the tower fore-and-aft.These control strategies that decrease the vibration of the system is verified by the simulation of MATLAB and GH. In addition, through the test in the wind field of Inner Mongolia Kulun, the transmission system with damping has some improvement action, but the tower with damping doesn't achieve the desired effect which needs further research.