Dynamic modeling and constant power control of wind turbines with trailing-edge flaps
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摘要:
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12~16m/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。Abstract:The wind turbine systems with trailing-edge flaps have broad prospects in application of large-scale 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 feedback 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.-
Key words:
- wind turbine /
- trailing-edge flaps /
- modeling /
- constant power control /
- dynamic inversion /
- robust control
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图 1 BEM中使用的形状像环形单元的控制体积
Figure 1. Control volume shaped as an annular element used in BEM model
图 2 升力系数和升阻比随迎角的变化
Figure 2. Variation of lift coefficient and lift-drag ratio with angle of attack
图 3 功率系数随叶尖速比和襟翼偏转角的变化
Figure 3. Variation of power coefficient with tip speed ratio and flap deflection angle
图 4 风电系统的变襟翼控制框图
Figure 4. Control block diagram of variable flap of wind power system
图 5 12~16 m/s阶跃风下风力发电系统响应
Figure 5. Response of wind power system with 12-16 m/s step wind
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