一种新的离散系统变结构控制方法

讨论了传统幂次趋近律的缺点,推导出一种新的离散趋近律,该趋近律弥补了单纯幂次趋近律在离散系统使用中的不足,并利用它设计了一种新的离散控制器。该变结构控制系统,可保证系统运动最终趋于零点,并有降低抖振和保持快速趋近的动态品质。对该离散趋近律的抖振进行了分析和仿真实验研究,分析和仿真结果表明该方法能保证系统状态在趋近过程中的连续性,能有效地减小系统抖振,并能保证系统渐近稳定。

A new sliding-mode variable structure control method for discrete system

Shortcomings of the power reaching law was discussed.An improved discrete reaching law is deduced，which makes up the deficiency in the discrete system based on single power reaching law，and a new discrete variable structure controller is obtained.The variable structure control system designed by using this new controller can gradually approach to zero.By analysing chattering of the discrete reaching law，it is found that the system chattering is decreased and fast reaching speed is kept.Simulation and analysis results both show that the effectiveness and feasibility of the proposed method，which can make the system keep continuity and eliminate system chattering effectively，and ensure the system asymptotic stability.