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Vol. 133, Issue 10, October 2011, pp.44-52

 

Bullet

 

Greenhouse Environmental Control Using Optimized MIMO PID Technique

 

Fateh BOUNAAMA and Belkacem DRAOUI

Department of Technology, Faculty of Technologies Sciences,

University of Bechar (Algeria),

Bechar, Algeria B. P. 417, 08000 Béchar, Algérie

Tel.: 213 49 81 55 81/91, fax: 213 49 81 52 44

E-mail: fbounaama2002@yahoo.fr, bdraoui@yahoo.fr

 

 

Received: 17 October 2011   /Accepted: 28 October 2011   /Published: 31 October 2011

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Abstract: Climate control for protected crops brings the added dimension of a biological system into a physical system control situation. The thermally dynamic nature of a greenhouse suggests that disturbance attenuation (load control of external temperature, humidity, and sunlight) is far more important than is the case for controlling other types of buildings. This paper investigates the application of multi-inputs multi-outputs (MIMO) PID controller to a MIMO greenhouse environmental model with actuation constraints. This method is based on decoupling the system at low frequency point. The optimal tuning values are determined using genetic algorithms optimization (GA). The inside outsides climate model of the environmental greenhouse, and the automatically collected data sets of Avignon, France are used to simulate and test this technique. The control objective is to maintain a highly coupled inside air temperature and relative humidity of strongly perturbed greenhouse, at specified set-points, by the ventilation/cooling and moisturizing operations.

 

Keywords: Greenhouse, MIMO PID, Constraints, GA, MIMO climate model, Collected data, Air temperature, Relative humidity

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