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Processes 2016, 4(2), 12;

Measurable Disturbances Compensation: Analysis and Tuning of Feedforward Techniques for Dead-Time Processes

Department of Computer Science and Automatic Control, ETSII, UNED, 28040 Madrid, Spain
Department of Informatics, University of Almería, ceiA3-CIESOL, 04120 Almería, Spain
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Juergen Hahn
Received: 31 January 2016 / Revised: 5 April 2016 / Accepted: 6 April 2016 / Published: 12 April 2016
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In this paper, measurable disturbance compensation techniques are analyzed, focusing the problem on the input-output and disturbance-output time delays. The feedforward compensation method is evaluated for the common structures that appear between the disturbance and process dynamics. Due to the presence of time delays, the study includes causality and instability phenomena that can arise when a classical approach for disturbance compensation is used. Different feedforward configurations are analyzed for two feedback control techniques, PID (Proportional-Integral-Derivative) and MPC (Model Predictive Control) that are widely used for industrial process-control applications. The specific tuning methodology for the analyzed process structure is used to obtain improved disturbance rejection performance regarding classical approaches. The evaluation of the introduced disturbance rejection schemes is performed through simulation, considering process constraints in order to highlight the advantages and drawbacks in common scenarios. The performance of the analyzed structure is expressed with different indexes that allow us direct comparisons. The obtained results show that the proper design and tuning of the feedforward action helps to significantly improve the overall control performance in process control tasks. View Full-Text
Keywords: disturbance compensation; feedforward control; process control; PID; GPC; MPC disturbance compensation; feedforward control; process control; PID; GPC; MPC

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Pawlowski, A.; Rodríguez, C.; Guzmán, J.L.; Berenguel, M.; Dormido, S. Measurable Disturbances Compensation: Analysis and Tuning of Feedforward Techniques for Dead-Time Processes. Processes 2016, 4, 12.

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