一种新的离散时间系统的变结构控制方法

A New Variable Structure Control Scheme for Discrete-Time System

讨论了基于指数趋近律的变结构控制所存在的问题,分析了指数趋近律中参数的选择对系统状态的趋近特性造成的影响,提出了改进的离散变结构控制方案。该方案保证了系统状态在趋近过程中能够始终保持某一趋近特性,易于进行变结构控制设计,加快系统状态趋近速度的同时降低了抖振,仿真结果证明了该方案的有效性。

The problem of exponent reaching law is discussed. The effect of the parameter choices is analyzed and an improved discrete variable structure control scheme is developed. The scheme is able to make the states of system keep one reaching behavior, which is better for designing variable structure control, reach the sliding surface quickly and avoid the system chatting. With the help of this scheme, the sliding surface can be reached quickly and the system chattering can be decreased at the same time. Finally, the result of simulation shows that the scheme is effective.