不确定离散时间系统的变结构控制设计
Variable Structure Control Design for Uncertain Discrete Time Systems
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摘要: 讨论了利用离散趋近律设计不确定离散时间系统的变结构控制问题,分析了离散趋 近律系数造成系统颤振的原因,给出了改进的离散趋近律,并利用它设计了变结构控制律,对 不确定部分建立灰色估计模型,估计出参数值.仿真结果表明该方法是可行的,有效地防止了 系统的颤振和不确定因素的影响.Abstract: In this paper, the design of variable structure control (VSC) of uncertain discrete time systems using discrete reaching law is discussed. The reason for the discrete reaching law to cause system chattering is given and an improved discrete reaching law is developed, by which the VSC is obtained straightforward. A grey estimating model is built for the uncertain part and thus values of parameters are obtained. Simulation results are presented to illustrate that the method presented in the paper is feasible and asymptotic stability of the closed system is ensured.
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