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Title: Strategies for enhancing nonlinear internal model control of pH processes
Authors: Hu, Q.
Rangaiah, G.P. 
Keywords: Input-Output Linearization
Internal Model Control
Nonlinear Systems
pH Processes
Robust Control
Issue Date: 1999
Citation: Hu, Q.,Rangaiah, G.P. (1999). Strategies for enhancing nonlinear internal model control of pH processes. Journal of Chemical Engineering of Japan 32 (1) : 59-68. ScholarBank@NUS Repository.
Abstract: Control of neutralization processes is very difficult due to nonlinear dynamics, different types of disturbances and modeling errors. The objective of the paper is to evaluate two strategies (augmented internal model control, AuIMC and adaptive internal model control, AdIMC) for enhancing pH control by nonlinear internal model control (NIMC). A NIMC controller is derived directly from input output linearization. The AuIMC is composed of NIMC and an additional loop through which the difference between the process and model outputs is fed back and added to the input of the controller. For the AdIMC, an adaptive law with two tuning parameters is proposed for estimating the unknown parameter. Both AuIMC and AdIMC are extensively tested via simulation for pH neutralization. The theoretical and simulation results show that both the proposed strategies can reduce the effect of modeling errors and disturbances, and thereby enhance the performance of NIMC for pH processes. Copyright © 1999 The Society of Chemical Engineers,.
Source Title: Journal of Chemical Engineering of Japan
ISSN: 00219592
Appears in Collections:Staff Publications

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