具有尾缘襟翼的风力机动力学建模与恒功率控制

具有尾缘襟翼的风力机在大型风力机领域具有广阔的应用前景。在具有可变尾缘襟翼的智能风力机中,通过控制襟翼偏转角可以调节风力机叶片的气动特性,可达到控制风电系统输出的目的。采用叶素动量方法建立了具有尾缘襟翼的风力机气动模型,在此基础上建立了智能风电系统的非线性动力学模型。基于动态逆方法对非线性系统进行线性化,采用H∞状态反馈方法设计了反馈控制器。针对12~16 m/s的阶跃风况和基于四分量模型所建立的实际风况进行了仿真验证,仿真结果表明,所设计的控制系统能有效控制风电系统的输出功率。

Dynamic modeling and constant power control of wind turbines with trailing-edge flaps

The wind turbine systems with trailing-edge flaps have broad prospects in application of largescale wind turbine system.In the smart wind turbines with variable trailing-edge flaps,the aerodynamic characteristics of the blades can be regulated by using the trailing-edge flaps,and then the purpose of the constant power output of the wind turbines can be achieved.In this paper,the aerodynamic model of wind turbine blades with variable trailing-edge flaps is presented firstly by blade element moment method.Then a nonlinear dynamic model of smart wind power system is established.The nonlinear model is linearized by dynamic inversion method.Based on the linearized model,the fecdback controller is designed through H∞ control.Finally,simulations are carried out for cases with 12-16 m/s step wind and actual wind based on four component model.Simulation results show that the control strategies are capable of controlling output power of wind power system effectively.