An auto-tuning modified Smith predictor for delay dominated integrating processes
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Abstract
Industrial chemical reactors are usually found to be integrating in nature with
significant amount of time delay. To achieve and maintain the desired output from such delay
dominated integrating processes is truly a challenging task for process engineers. Here, we
propose an auto-tuning scheme for modified Smith predictor based PID controller so that an
overall improved process response can be ensured during their close-loop operation. Initial
PID tuning parameters are realized using well accepted Ziegler-Nichols ultimate cycle
relation. Intricacies due to large dead time is taken care by the well-known modified Smith
predictor while the proposed auto-tuning feature will provide improved responses during set
point tracking as well as load recovery phases. Performance enhancement of the proposed
auto-tuning modified Smith predictor is verified with well-known integrating process models
with large dead time representing the behavior of chemical reactors. Considerable
improvement is found during simulation study with substantial robustness.
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