A Novel Two-Degree-of-Freedom Control Strategy for Unstable Processes with Delay

Authors:	Gu Danying, Shanghai Jiaotong University, China Ou Linlin, Shanghai Jiaotong University, China Chen Peiying, Shanghai Jiaotong University, China Zhang Weidong, Shanghai Jiaotong University, China
Topic:	2.1 Control Design
Session:	Time-Delay Systems II
Keywords:	PID controllers; time delay; unstable; stabilizing controllers; robustness

Abstract

A simple and practical two-degree-of-freedom control strategy is proposed for unstable processes with time delay. It can decouple load disturbance from setpoint response. By combining the theory on stabilizing PID controller proposed by Silva et al. with IMC method, the process in which the ratio of time delay to unstable time constant is smaller than 2 can be controlled effectively. Simulation examples are given to show the performance of the proposed method.