基于云模型的变桨距系统积分滑模控制

针对具有参数变化和外加干扰的变桨距风力发电系统,提出了一种基于云模型的积分滑模控制。在滑模控制中引入误差项的积分,并用状态量代替误差的导数,消除传统滑模控制需要期望输出信号导数已知的假设;利用云模型的不确定性推理方法,动态地调节切换增益;利用积分的方法对切换增益进行估计,估计出系统中不确定因素的界,有效地削弱系统的抖振。仿真结果表明:该控制器用于风速高于额定风速以上的变桨距控制系统中,具有较好的控制品质,对系统参数的不确定和外部干扰具有很强的鲁棒性。

Integral Sliding Mode Control of Variable Pitch System Based on Cloud Mode

An integral sliding mode control scheme of cloud mode is proposed for variable pitch wind power system with uncertain parameters and strong disturbances.The control approach introduces integral control and uses state variable instead of derivative of error to avoid assumption that the derivative of desired output signal must be known in traditional sliding mode control.With uncertainty reasoning method of cloud model,the switching gain is dynamically adjusted.The upper bound of system uncertainties is effectively estimated by using integral method to reduce the system chattering.Simulation results indicate that the controller is used for the variable pitch control system whose wind speed is above rated wind speed,the control system has better control quality and strong robustness.