Control And Aerodynamic Performance Analysis Of Smart Blade On Wind Turbine

Along with the development of the wind power generation,the design power and blade scale of the wind turbine are improving.Among these,the improving wind turbine blade scale leads to the growing wind turbine fatigue and extreme load which decreases the operational efficiency and raises the maintenance cost.In that context,the researchers developed the concept of smart blade.This paper focus on the load alleviation and power control technology,which chooses the NREL 5MW reference wind turbine as the study target and carry on a lot research on the aerodynamic performance and control research of the smart blade wind turbine with trailing edge flaps,the achievements are as follows.(1)To study the load suppression of trailing edge flap for wind turbine,a new smart blade wind turbine simulation platform with trailing edge flaps is developed.Then,The multi-model multi-variable DMC algorithm is developed based on the predictive control algorithm to control the wind turbine's blade flapwise root moment aiming at the wind turbine fatigue load's fluctuation and periodic variation,the simulation is carried out.The simulation result shows that with d-q conversion,the IF controller designed by multi-model multi-variable DMC algorithm can effectively control the wind turbine's blade flapwise root moment,which show a better performance than the MPC controller without d-q conversion.(2)A new DMC algorithm with output-correction is developed targeting at the power smoothness for wind turbine and the simulation is carried out to aim at the small nonlinear relationship between rotor power and the trailing edge flap angle,.The simulation result shows that the CF controller using new DMC algorithm have better control performance than the traditional DMC controller,which shows a good control result on both steady and turbulent wind conditions.(3)The DMC multi-target flap control strategy is designed to alleviate the blade flapwise root moment fluctuation and smooth the rotor power to aim at the huge fluctuation of the power output and fatigue load of win d turbine,.The simulation result shows that the DMC multi-target flap control strategy have shorter control time and better control performance than the PID multi-target flap control strategy.The DMC multi-target flap control strategy can both alleviate the fatigue and smooth the rotor power effectively.