Shamsuzzoha M, Lee Moonyong
School of Chemical Engineering and Technology, Yeungnam University, Kyongsan 712-749, South Korea.
ISA Trans. 2009 Apr;48(2):237-44. doi: 10.1016/j.isatra.2008.10.010. Epub 2008 Dec 5.
The present study suggests a disturbance estimator design method for application to a recently published, two-degree-of-freedom, control scheme for open-loop, unstable processes with time delay. A simple PID controller cascaded with a lead-lag filter replaces the high-order disturbance estimator for enhanced performance. A new analytical method on the basis of the IMC design principle, featuring only one user-defined tuning parameter, is developed for the design of the disturbance estimator. Several illustrative examples taken from previous works are included to demonstrate the superiority of the proposed disturbance estimator. The results confirm the superior performance of the proposed disturbance estimator in both nominal and robust cases. The proposed method also offers several important advantages for industrial process engineers: it covers several classes of unstable process with time delay in a unified manner, and is simple and easy to design and tune.
本研究提出了一种干扰估计器设计方法，该方法适用于最近发表的一种针对具有时滞的开环不稳定过程的二自由度控制方案。一个简单的PID控制器与一个超前-滞后滤波器级联，取代了高阶干扰估计器，以提高性能。基于内模控制（IMC）设计原理开发了一种新的分析方法，该方法仅具有一个用户定义的调谐参数，用于干扰估计器的设计。包含了几个取自先前工作的示例，以证明所提出的干扰估计器的优越性。结果证实了所提出的干扰估计器在标称和鲁棒情况下均具有卓越性能。所提出的方法还为工业过程工程师提供了几个重要优势：它以统一的方式涵盖了几类具有时滞的不稳定过程，并且设计和调谐简单易行。
