并网逆变器逆系统自学习滑模抗扰控制

摘要

针对三相并网逆变器模型的多变量、非线性、强耦合等特点,采用开关函数法建立其开关周期平均模型,在此模型的基础上采用逆系统方法实现反馈线性化和解耦控制,对伪线性系统设计自适应滑模抗扰控制器,使用非线性光滑函数设计扩张状态观测器以实现内部建模误差与外部扰动的扩张状态估计,并将非线性扩张状态观测器和跟踪微分器与自学习滑模控制器结合使用.仿真结果表明,该方法具有响应速度快、控制精度高、抗扰能力强的特性,在并网逆变器中具有较大应用价值.%According to the three-phase grid inverter model with multi-variable,nolinear,strong coupling,a switch function method is used to establish the switch cycle average model.An inverse system is designed to realize the model feedback linearization and decoupling control,and an adaptive,disturbance rejection sliding mode controller is designed for pseudo-linear system.The proposed method realized the extended state estimation of internal parameters perturbation and external disturbances of the model based on nonlinear extended state observer(NLESO) and tracking differentiator(TD) designed by nolinear smooth function.Matlab simulation results show that the proposed method has the characteristrics of fast response,high control precision and strong disturbnance-rejection ability,which has an important application value in control field of the grid inverter.