Articles
CO-STATE VARIABLES AS STRATEGIC SET-POINTS FOR ENVIRONMENTAL CONTROL OF GREENHOUSES
Article number
797_7
Pages
69 – 74
Language
English
Abstract
Co-state variables are the marginal values of the state variables of a system.
Given a suitable model of the system to be controlled, the best values of the co-states can be determined.
Since the relevant co-states are generally few, varying rather slowly and activating several control fluxes each, they can play the role of strategic set-points.
A greenhouse grower wishing to control processes like growth, development and even certain disorders, may use the associated co-states to boost or retard the process of concern.
In this study, simulations of simple cases have been carried out to illustrate the concept.
By changing the growth co-state, activating simultaneously four fluxes (light, heat, ventilation and CO2), the system is able to counteract the effects of unexpected weather and erroneous model.
Given a suitable model of the system to be controlled, the best values of the co-states can be determined.
Since the relevant co-states are generally few, varying rather slowly and activating several control fluxes each, they can play the role of strategic set-points.
A greenhouse grower wishing to control processes like growth, development and even certain disorders, may use the associated co-states to boost or retard the process of concern.
In this study, simulations of simple cases have been carried out to illustrate the concept.
By changing the growth co-state, activating simultaneously four fluxes (light, heat, ventilation and CO2), the system is able to counteract the effects of unexpected weather and erroneous model.
Publication
Authors
I. Seginer
Keywords
vegetative crop, crop model, greenhouse model, deviating weather, on-line adjustment
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