Title :
PID control of unstable systems having time delay
Author :
Shyh-Hong Hwang ; Shing-Jia Shiu ; Min-Lang Lin
Author_Institution :
Dept. of Chem. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan
Abstract :
The identification of unstable systems with time delay is first addressed. Two limit points of conditional stability are characterized using a relay and a novel nonlinear function. Algorithms are developed to calculate the information based on excited stable limit cycles. A cascade PID control structure is then proposed to stabilize the system and achieve desirable performance.
Keywords :
cascade control; delays; identification; nonlinear control systems; relay control; stability; three-term control; cascade PID control; conditional stability; nonlinear function; relay; time delay; unstable system identification; Delays; Frequency estimation; Limit-cycles; Relays; Stability criteria; Steady-state; Delay systems; Describing function analysis; Linear identification; PID control;
Conference_Titel :
Control Conference (ECC), 1997 European
Conference_Location :
Brussels
Print_ISBN :
978-3-9524269-0-6
