Title :
A robust PID tuning method for unstable FOPTD process
Author :
Zhang Kun ; He Xing ; Zhang Weidong
Author_Institution :
Dept. of Autom., Shanghai Jiao Tong Univ., Shanghai, China
Abstract :
In this paper, a robust PID controller tuning method based on process model for unstable first order plus time delay (FOPTD) system is proposed. The proposed method is derived under H∞ performance index. The unified PID controller parameters are induced through McLaughlin series expansion and the Pade approximation. The closed-loop transfer function with the proposed PID controller gives an accurate set point filter and the controller setting has a robust performance under uncertainty in the process model parameters. Closed-loop responses tuned by the proposed method are compared with existing methods. The simulation results show that the presented method gives better performances.
Keywords :
H∞ control; approximation theory; closed loop systems; delay systems; performance index; robust control; series (mathematics); three-term control; transfer functions; FOPTD system; H∞ performance index; McLaughlin series expansion; Pade approximation; closed-loop responses; closed-loop transfer function; controller setting; first order plus time delay system; process model parameter; robust PID controller tuning method; robust PID tuning method; robust performance; set point filter; unified PID controller parameter; unstable FOPTD process; Analytical models; Approximation methods; Control systems; Process control; Robustness; Transfer functions; Tuning; H∞; McLaughlin series expansion; PID controller; Set point filter; Unstable systems;
Conference_Titel :
Chinese Automation Congress (CAC), 2013
Conference_Location :
Changsha
Print_ISBN :
978-1-4799-0332-0
DOI :
10.1109/CAC.2013.6775720
