ISHS Acta Horticulturae 691: International Conference on Sustainable Greenhouse Systems - Greensys2004
MULTIVARIABLE GREENHOUSE CONTROL: APPLICATIONS TO FERTIGATION AND CLIMATE MANAGEMENT |
| Authors: | A. Lecomte, J.M. Flaus, E. Brajeul, R. Brun, P. Reich, L. Barthelemy |
| Keywords: | fertigation, climate, multivariable control, real time, models, set points |
| Abstract:
The objectives of this study were to analyse and develop an original methodology applied to the greenhouse controls, in particular for fertigation (control of humidity and electroconductivity inside slab, drainage ratio) and climatic management (control of the main climatic parameters like air humidity and temperature). Predictive commands are used for these controls; they offer good compromises between performances and costs for climatic control and more generally, they are well adapted to this type of process (multivariable device, important delays, robust method). Command rules need a model of the process. General transfer function are used with a periodically identification (each week). Last, results given in this paper are obtained in simulation for climatic control and in real conditions for fertigation. | |
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