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A discussion of challenges related to the modeling and control of
greenhouse crop growth, this book presents state-of-the-art answers
to those challenges. The authors model the subsystems involved in
successful greenhouse control using different techniques and show
how the models obtained can be exploited for simulation or control
design; they suggest ideas for the development of physical and/or
black-box models for this purpose. Strategies for the control of
climate- and irrigation-related variables are brought forward. The
uses of PID control and feedforward compensators, both widely used
in commercial tools, are summarized. The benefits of advanced
control techniques-event-based, robust, and predictive control, for
example-are used to improve on the performance of those basic
methods. A hierarchical control architecture is developed governed
by a high-level multiobjective optimization approach rather than
traditional constrained optimization and artificial intelligence
techniques. Reference trajectories are found for diurnal and
nocturnal temperatures (climate-related setpoints) and electrical
conductivity (fertirrigation-related setpoints). The objectives are
to maximize profit, fruit quality, and water-use efficiency, these
being encouraged by current international rules. Illustrative
practical results selected from those obtained in an industrial
greenhouse during the last eight years are shown and described. The
text of the book is complemented by the use of illustrations,
tables and real examples which are helpful in understanding the
material. Modeling and Control of Greenhouse Crop Growth will be of
interest to industrial engineers, academic researchers and
graduates from agricultural, chemical, and process-control
backgrounds.
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