Decentralized control for processes with input and output nonlinearities

Chemeca 2004 Conference
Publication Type:
Conference Proceeding
Proceedings of Chemeca 2004 Conference: 32nd Australasian Chemical Engineering Conference, 2004, pp. 1 - 6
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Decentralized control is the most widely used control strategy in the process industry because of its simplicity in controller design and implementation and its potential to achieve failure tolerant control. Actuator/sensor nonlinearities are often encountered in many chemical processes. This paper presents a new decentralized control method for processes which have static actuator/sensor nonlinearities, such as saturation, hysteresis and dead zone. The proposed decentralized integral controller is designed based on feedforward passivation, which can be applied to nonminimum phase processes and/or processes of high relative degree. The concept of marginally stable positive real systems is used to analyse the stability of a closed-loop system. The feedforward system is constructed to attain dynamic performance on the basis of frequency based passivity analysis. The proposed approach is used in the control of a quadruple tank process which has static nonlinearity in its actuators.
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