Abstract:To improve the dynamic performance in the operation region of constant power output,multivariable control strategy using a sliding mode control technique is proposed by the reaching law method,adding the generator torque as the other control variable of wind power generation system with blade pitch angle to be controlled simultaneously.The addition of generator torque control can not only guarantee generator power and generator speed stable around its rated value,but minimize torsional torque fluctuations in the drive train and pitch actuator activity,and improve the quality of the electrical power and reduce the pressure of the mechanical parts of the system at the same time.Multivariable and monovariable control strategy under high wind speed are simulated on Matlab,the comparison results highlight the advantages of multivariable control strategy.The performance of the proposed SMC strategy is simulated and compared with PI control method,verifying the validity of control algorithm.