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Model identification and PID control of long time-delay processes
Tang Wei Shi Songjiao Wang Mengxiao
Dept. of Autom., Shanghai Jiao Tong Univ.;

This paper appears in: Intelligent Control and Automation, 2002. Proceedings of the 4th World Congress on
Publication Date: 2002
Volume: 2, On page(s): 974- 978 vol.2
ISSN:
ISBN: 0-7803-7268-9
INSPEC Accession Number: 7412293
Digital Object Identifier: 10.1109/WCICA.2002.1020721
Current Version Published: 2002-11-07

Abstract
A relay feedback identification auto tuning PID/PI control is proposed, which is capable of controlling long time-delay processes. The real process is approximated via FOPDT or SOPDT models, whose parameters are specified through a modified relay feedback identification method. Applying zero-pole cancellation principle, the PID/PI is tuned according to the specified amplitude and phase margins. Model identification and controller parameter tuning are done online without much influence on the normal operation. This algorithm also has many other advantages such as fast setpoint response, strong robustness and good disturbance rejection ability.

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