The Research Of Load Control In Wind Turbine

With the wind turbine becoming large and light, its components become more flexible and the natural frequency of the system reduce gradually. The longtime vibration of the components due to the loads, will lead to fatigue destroy. In order to keep down the vibration and prolong the fatigue life of the components, we have to do the load control. So ,based on the structure dynamics, classical control theory, modern control theory, active control theory and passive control theory, this article firstly studies how the load produce, according to building up the A state-space model of the control system in wind turbine then doing the simulation, designing the PI controller, give a active control method. Then take the tower for example, compare the load and its fatigue life before do the load control with that after it, testify the load control method. According to building up the state-space model of the main-shaft system in wind turbine, studying the torsional vibration characters, taking the low-speed shaft for example, optimizing its size to improve its antivibration ability. Also, we can get the torsional vibration natural frequency of the main-shaft system, comparing it with the inspirit frequency of the rotor, we can reach the conclusion that it won't lead to a resonance between the main-shaft system and the rotor.