无模型控制器在风电变桨控制系统中的应用

由于风速、风向的随机性导致风力发电变桨距系统具有非线性、强耦合、大时滞等特点，难以准确建模。为改善系统动态性能，保证发电机输出功率恒定，将无模型控制器引入到风力发电变桨系统中。采用MATLAB软件的Simulink工具构建该模型并仿真。结果表明，在高风速段和额定风速附近，发生相同的风速变化值，无模型变桨控制系统通过桨距角的不同调节可以很快实现发电机的恒功率输出。另一方面，本文将该控制系统应用于风力发电机组运行测试，其运行结果与模拟结果一致。因此，本文设计的无模型变桨系统控制效果良好，优化了风电系统的稳定性。

Application of model free controller in wind power pitch systems

It is difficult to simulate the wind turbine pitch systems precisely which has the features of time changing, nonlinear and disturbing, because of the randomness for speed and wind of wind. In order to improve the dynamic of system and keep the stability of power output, the model free controller is performed in the wind turbine pitch systems. Next, the MATLAB Simulink is applied to build the control system. The simulation results show that the stability of wind power system can be improved through adjusting the angle of turbine pitch with different wind directions, resulting in excellently ability to operate the system. On the other hand, the model free controller is used as decision system in the wind generators, and the operation results consistent with simulation results. Thus, the wind power pitch systems based on model free controller can optimize the stability for wind generators.