基于Wiener模型的风力发电系统变桨距控制

风力发电系统具有非线性强和波动性大的特点，如何在风速随机变化的工况下，快速地将风电机组输出功率控制在额定范围内是风电系统控制面临的重大难题。针对5 MW风电机组的变桨距控制问题，提出一种基于Wiener模型的风力发电系统变桨距控制方案。根据Wiener模型线性和非线性环节可分离的特殊结构，通过计算非线性环节的逆，构造具有线性性质的广义风电系统被控对象，将风电系统非线性变桨距控制问题简化为线性模型控制问题。采用独立可分离信号分步辨识风电机组Wiener模型，可以更加精准地预测风电机组输出功率。仿真实例表明：该控制方法有效地提高了变桨距系统的控制效果。

Variable Pitch Control of Wind Power Generation System Based on Wiener Model

Strong nonlinearity and large fluctuation are the characteristics of wind power generation system. Quickly controlling the output power of wind turbines within the rated range under wind speed random changes is the major problem of wind power system control. Aiming at the pitch control of 5 MW wind turbines, a pitch control scheme for wind power generation systems based on the Wiener model is proposed. On the basis of the special structure in which the linear and nonlinear links of the Wiener model can be separated, the controlled object of a generalized wind power system with linear properties is constructed by calculating the inverse of the nonlinear part, which simplifies the nonlinear pitch control problem of the wind power system to a linear model control. The independent separable signal is used to identify the Wiener model of wind turbines by separate steps, which can accurately predict the output power of the wind turbines. The simulation examples show that the control method can effectively improve the control effect of the pitch system.