Torque Ripple Control for Drive-Train in Variable Speed Constant Frequency Wind Turbines
|Course||Motor and electrical|
|Keywords||Wind turbine Drive-train State feedback Active Disturbance Rejection Control|
Energy and environment are pressing problems that must be settled by human beings for future survival and development. More attention has been paid to the wind power generation due since the wind energy is a“green”and cheap renewable energy source. For the sake of improving the efficiency of wind energy and increasing the reliability of the mechanical part, all kinds of research for WTGS has widely developed in many countries.The wind turbine is a highly nonlinear system and its operating environment is extremely hostile. With the development of large-scale wind turbines and the introduction of flexible structures, vibration problems appear more and more serious. Random wind fluctuation, wind shear and tower shadow effect can all cause large ripples on drive-train torque. In this paper, two controllers are proposed for speed vibration suppression and torque ripple suppression. One is the observer-based state feedback generator torque controller, witch can add damping to the first drive-train torsion mode. The other is the rotor collective pitch controller based on Active Disturbance Rejection Control (ADRC), witch is designed to regulate generator speed. Both of the controllers are built on the basis of the model linearization method. The simulation results show that the control strategy can significantly reduce drive-train torque ripples. Witch demonstrates the excellent dynamic performance and robustness of the system. Hence proving that the new method will have an important value in engineering application.