大型风力发电机组无模型独立变桨载荷控制

Model free and individual pitch load control for large-scale wind turbine

高风速时,为平衡大型风力机所受推力载荷,利用无模型控制不依赖系统数学模型的特性,针对难以准确建模的非线性风力机组,推导了风力机无模型输入输出关系方程。通过利用输入输出实测数据,在线递推估计风力机待估参数,给出了在线估值算法,导出了无模型独立变桨控制律的形式。在Matlab/Simulink上搭建了一3MW风力机组仿真平台,验证了无模型控制律的正确性和有效性。与传统PI独立变桨距载荷控制相比,在随机风和突变渐变风下,所给出的无模型控制方法,既能使载荷得到较好平衡,又能使风力机桨叶动作频率、幅度小。

When the wind speed is high, in order to balance the thrust load, using the characteristics of the model free control which does not depend on the mathematical model of the system, the relationship equation between input and output of model free wind turbine is deduced for nonlinear wind turbine units which are hard to model precisely. According to the input and output data, on-line recursive estimation of wind turbine parameters is conducted, the on-line estimation algorithm is given, and the law of model free and independent pitch control is derived. The 3 MW wind turbine simulation platform is built in Matlab/Simulink, which proves the model free control law is correct and effective. Compared with traditional PI independent pitch load control, under stochastic wind and mutant gradient wind, the model free control method can not only balance the load better, but also lessen the operate frequency and amplitude of blades of the wind turbine.