DYNAMIC MODELING AND SIMULATION OF PITCH CONTROL STRATEGY FOR WIND TURBINES BASED ON LQR METHOD

A disturbance accommodating Linear Quadratic Regulator(LQR)method was applied in pitch control system to achieve good performance.The disturbance can be estimated by designing state observer,and a feedback was added into the input to eliminate disturbance effect.The feed back matrix was calculated in accordance to LQR control theory.A wind turbine dynamic model was set up,and simulation of the control system was preformed based on Matlab7.1/simu- link.The simulation results showed thatod the controller ensures pitch control actuator little fatigue,and has smaller overshoot.The proposed method has better perfonnance and is easy to realize.