基于LQR方法的风电机组变桨距控制的动态建模与仿真分析

DYNAMIC MODELING AND SIMULATION OF PITCH CONTROL STRATEGY FOR WIND TURBINES BASED ON LQR METHOD

为了获得更好的变桨距控制效果,将扰动校正LQR(Linear Quadratic Regulator)应用到风电机组变桨距控制中,该方法通过设计扰动状态观测器估计出作为扰动量的风速,在输入量中加入一个反馈量来消除风速产生的扰动影响,然后根据LQR控制理论,计算出状态反馈矩阵。建立了风电机组的动态模型,并根据动态模型在Mat- lab7.1/simulink环境下进行了仿真。仿真结果表明,基于扰动校正的LQR控制方法超调小,变桨距执行机构疲劳度小,具有良好的动态性能。该方法易于工程实现,适用于变桨距控制系统。

A disturbance accommodating Linear Quadratic Regulator （LQR） method was applied in pitch control system to achieve good performance. The disturbance can be estimated by designing state observer, and a feedback was added into the input to eliminate disturbance effect. The feed back matrix was calculated in accordance to LQR control theory. A wind turbine dynamic model was set up, and simulation of the control system was preformed based on Matlab7.1/simulink. The simulation results showed thated the controller ensures pitch control actuator little fatigue, and has smaller overshoot. The proposed method has better performance and is easy to realize.