基于Smith的非最小相位对象PID控制器设计  

Design of PID Controller for Non-minimum Phase Plants Based on Smith Predictor

作　　者：王丽飞[1] 田学民[1] 

机构地区：[1]中国石油大学(华东)信息与控制工程学院,山东东营257061

出　　处：《控制工程》2008年第S1期49-51,54,共4页Control Engineering of China

摘　　要：针对具有非最小相位时滞的过程,基于Smith预估控制思想,提出一种改进控制方案,对右半平面零点和纯滞后同时进行补偿,使闭环特征方程中不含右半平面零点,从而简化控制器设计。根据期望闭环传函,解析得出PID控制器形式,综合负调、响应时间、ISE以及鲁棒性要求整定控制器参数,针对Smith控制抗扰性较差提出了抗扰性设计。仿真结果表明,该方案对于具有非最小相位时滞的对象有较好的控制效果,并且在模型失配和有干扰输入的情况下,有较好的鲁棒性和抗扰性。A design scheme of PID controller for non-minimum phase plants plus dead time based on Smith predictor is proposed.Both right-half-plane and dead time can be compensated.The RHP and dead time are removed from the characteristic equation so that the control design is greatly simplified.By proposing the desired closed-loop transfer function,the PID controller form is analytically derived.Controller parameter is turned by analyzing the time domain specifications and robust stability.According to the worse inte...

关 键 词：非最小相位 SMITH预估器 PID控制器 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]