Vibration Control Of Wind Turbine Tower Based On Robust Control Theory

Energy is always accompanied by people's life.With the development of industrialization,people's demand for energy is bigger and bigger.However,the fossil energy on the earth is limited,and is drying up increasingly.Human beings are facing severe energy problems.Therefore,the development of renewable energy has become the direction of energy development in all countries of the world.In renewable energy,wind energy is highly valued because of its wide distribution,low development difficulty and cleanness.With the development of wind power industry,the wind turbines tend to be larger and the tower height is also higher and higher.Improving the power generation stability of wind turbines and suppressing the vibration of tower become the key to the development of wind power industry.In this paper,the 2MW doubly fed wind turbine is selected as the research object.Based on the robust H? control theory,the variable pitch controller is designed to enhance the stability of power generation and suppress the torsional vibration and the front and rear direction vibration of the tower.First,the wind turbine model is built in the Bladed software,and then the linearization function of the software is used to obtain the linearized model of the wind turbine at a single wind speed point.The linearized model is processed and the matrix transformation is used to obtain the state space model suitable for robust control theory.The controller is solved in Matlab and compared with the PI controller to verify the amplitude frequency and step response performance of the robust controller.In order to further verify the effectiveness of the robust controller,we compile the external controller program and use the robust controller to simulate the wind power generation operation,and compare it with the simulation experiment results of the PI controller.The simulation results show that the PI controller and the robust controller have little difference in the control effect between the power generation power and the tower vibration under the steady wind.In the turbulent wind,stability of power generation process under robust controller is better than PI controller,also the tower fore-after vibration were significantly inhibited and reduced the tower vibration instability,improve the safety.