摘要
为提高SMITH预估控制的鲁棒性,以适应控制对象模型不确定性,提出一种具有扰动观测器的改进控制方法,同时给出基于ITAE准则(即时间乘绝对误差积分准则)的PI(比例积分)控制器参数整定公式。把外扰和模型不确定性都看作外部扰动,通过扰动观测器进行估计,从而达到把纯滞后环节置于闭环之外的目的。仿真结果表明:在被控对象具有模型不确定性的情况下,该控制方法与SMITH预估控制相比,在设定值跟踪和扰动抑制方面均具有较好的控制性能,提高了系统的鲁棒性。
SMITH predictive control is an effective method for systems with time-delays. A proportional-integral SMITH control model with a disturbance observer was developed, and a parameters tuning formula was introduced based on ITAE (time integral and absolute error) criteria. The disturbance observer evaluates all disturbances including external disturbances and model uncertainties. Simulation results show that this new control scheme not only effectively improves the dynamic performance of reference tracking and disturbance rejection but also provides better robustness for model uncertainties.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2003年第12期1664-1667,共4页
Journal of Tsinghua University(Science and Technology)
