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Modified Smith-predictor multirate control utilizing secondary process measurements

Ergon, Rolf
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URI
http://hdl.handle.net/11250/2438399
Date
2001
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  • Institutt for elektro, IT, og kybernetikk [193]
Original version
Conference paper. International Carpathian Control Conference, ICCC'2001. Krynica, Poland, May 22-25, 2001  
Abstract
The Smith-predictor is a well-known control structure for industrial time delay systems, where the basic idea is to estimate the nondelayed process output by use of a process model, and to use this estimate in an inner feedback control loop combined with an outer feedback loop based on the delayed estimation error. The model used may be either mechanistic or identified from recorded data. The paper discusses improvements of the Smith-predictor for systems where additional secondary process measurements without time delay are available as a basis for the estimation. The estimator may then be identified from recorded data also in the common case when the primary outputs are sampled at a lower rate than the secondary outputs. A simulation example demonstrates the feasibility and advantages of the suggested control structure.

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