Deadtime Compensation and Zero Frequency Decoupling of a Thermal Hydraulic Process

[+] Author and Article Information
J. Z. Liu

North China Institute of Electric Power, Baoding, People’s Republic of China

J. K. Pieper, B. W. Surgenor

Department of Mechanical Engineering, Queen’s University, Kingston, Canada K7L 3N6

J. Dyn. Sys., Meas., Control 114(3), 527-531 (Sep 01, 1992) (5 pages) doi:10.1115/1.2897382 History: Received March 01, 1990; Revised August 01, 1991; Online March 17, 2008


This brief details the design and experimental implementation of a practical multivariable controller applied to a thermal hydraulic process. Features of the design include a first-order plus deadtime process model, zero frequency decoupling, and multivariable deadtime compensation. The deadtime compensator allowed higher loop gains and consequently improved overall performance. Practical first order prediction based on an estimated delay and process time constant achieved the deadtime compensation. The high gain controller effectively handled both setpoint changes and disturbance rejection. An intelligent choice of estimation schemes yielded a simple but accurate model.

Copyright © 1992 by The American Society of Mechanical Engineers
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