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Open AccessArticle

Simple Tuning Rules for Feedforward Compensators Applied to Greenhouse Daytime Temperature Control Using Natural Ventilation

1
Faculty of Agricultural Sciences, National University of Colombia, Medellín Campus, Medellín CO050034, Antioquia, Colombia
2
Department of Informatics, University of Almería, CIESOL, ceiA3, E04120 Almería, Spain
*
Author to whom correspondence should be addressed.
Agronomy 2020, 10(9), 1327; https://doi.org/10.3390/agronomy10091327
Received: 30 July 2020 / Revised: 20 August 2020 / Accepted: 31 August 2020 / Published: 4 September 2020
(This article belongs to the Special Issue Greenhouse Technology)
In this work, simple tuning rules for feedforward compensators were applied to design a control strategy to regulate the inside air temperature of a greenhouse during daytime by means of a natural ventilation system. The developed control strategy is based on a PI (Proportional-Integral) controller combined with feedforward compensators to improve the performance against measurable external disturbances such as outside air temperature, solar radiation, and wind velocity. Since the greenhouse process dynamics is very complex and physical non-linear models are mathematically complicated, a system identification methodology was proposed to obtain simpler models (high-order polynomial and low-order transfer functions). Thus, an easier procedure was completed to tune the PI controller parameters and to obtain the feedforward compensators expressions by following a series of modern and simple tuning rules. Simulations with real data were executed to compare the control performance of a PI controller with or without the addition of feedforward compensators. Moreover, real tests for the developed control strategy were carried out in an experimental greenhouse. Results demonstrate an enhanced control performance with the presence of the feedforward compensators under different weather conditions. View Full-Text
Keywords: disturbance rejection; PID control; system identification; ARX model disturbance rejection; PID control; system identification; ARX model
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Montoya-Ríos, A.P.; García-Mañas, F.; Guzmán, J.L.; Rodríguez, F. Simple Tuning Rules for Feedforward Compensators Applied to Greenhouse Daytime Temperature Control Using Natural Ventilation. Agronomy 2020, 10, 1327.

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