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PH—Postharvest Technology: Automatic Control of Crossflow Grain Dryers, Part 2: Design of a Model-Predictive Controller

✍ Scribed by Qiang Liu; F.W. Bakker-Arkema

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
331 KB
Volume
80
Category
Article
ISSN
0021-8634

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✦ Synopsis

Continuous-#ow grain drying is a non-linear process with a long delay; it is often subjected to large disturbances, and therefore is di$cult to control. In this paper, a new model-predictive control system for cross#ow dryers is presented. The controller uses a recently developed distributed parameter process model along with a grain #owrate optimizer for feedforward control, and a parameter estimator/modi"er for feedback action. Simulation tests on a virtual dryer show that the controller performed well over a wide range of drying conditions. This paper is followed in Part 3 by a description of the "eld testing of the model-predictive controller on a commercial cross#ow grain dryer.

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The grain drying process is di$cult to control because of its non-linearity and long delay. In this series of three papers, a model-predictive controller specially designed for the grain drying process is presented. Part 1 describes the development of a distributed-parameter process model based on t