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针对含有匹配不确定项的线性离散时间系统,设计了一种全程滑模控制器,使系统状态在初始时刻就在切换区内.给出了一种双曲正切离散趋近律,由这种改进的趋近律所设计的控制器不但可以减小系统稳态误差,而且能够削弱系统的抖振强度.将该方法应用在Buck变换器的控制器设计中,对Buck变换器的电压进行跟踪控制,仿真结果验证了所给控制策略的有效性.
Aiming at the linear discrete time system with matching uncertainties, a full sliding mode controller is designed so that the system state is within the switching region at the initial moment. A hyperbolic tangential discrete approximation law is given, The improved approach to the law not only reduces the steady-state error of the system but also weakens the chattering strength of the system.This method is applied to the Buck converter’s controller design to track the voltage of Buck converter Control, simulation results verify the effectiveness of the given control strategy.