新型Smith预估控制器在大延迟系统中的应用

Application of new Smith predictor in large time-delay system

针对控制系统中出现的大延迟问题,推导出了调节器在积分形式下的控制率,从而提出积分调节器Smith预估控制方法。根据推导出的新型Smith预估控制算法可知:只要系统的放大倍数取足够大,控制器在很快时间内就消除误差,可有效地解决系统中的大延迟问题。采用Matlab中的Simulink对新型Smith预估控制系统进行了调节器参数变化、被控对象增益变化、被控对象延迟时间变化的仿真,通过对仿真结果进行比较,可以看出新型Smith控制系统具有快速性和较高的稳定性,对被控对象参数变化不敏感,且结构简单等特点。

For the large time-delay of control systems,the control factor of integral regulator is deduced and the Smith predictor control with integral regulator is presented.According to the control algorithm of presented Smith predictor,the integral regulator diminishes rapidly the error caused by the large time-delay when the system magnification coefficient is big enough.The new Smith predictor control system is simulated by Simulink with different parameters of integral regulator and different gains and time-delays of controlled object.Results show that the new Smith predictor control system has faster response,better stability,simple structure and immunity to the parameter change of objects controlled.