具有扰动观测器的改进SMITH预估控制

• 作 者: 邹丽 杨献勇
• 机 构: 清华大学热能工程系,清华大学热能工程系 北京100084,北京100084
• 出 处: 清华大学学报(自然科学版)
• 发表日期: 2003年12期
• 关键词: 自动控制 SMITH预估控制 时滞对象 扰动观测器 模型不确定性

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。

In order to improve the robustness of the SMITH predictive control and adapt to the uncertainty of the control object model, an improved control method with disturbance observer is proposed. At the same time, PI (based on ITAE criterion (ie time multiplied by absolute error) Proportional integral) controller parameter tuning formula. Extrinsic disturbances and model uncertainties are regarded as external disturbances, which are estimated by perturbation observer, so as to achieve the purpose of placing the pure hysteresis outside the closed loop. The simulation results show that, compared with SMITH predictive control, this control method has better control performance in setting tracking and disturbance rejection when the controlled object has the model uncertainty, and improves the system’s robustness Great.