Optimal control of greenhouse cultivation


Optimal control of greenhouse cultivation

Gerrit van Straten ... [et al.]

CRC Press, c2011

  • : hardback

大学図書館所蔵 件 / 5



Includes bibliographical references and index



Greenhouse control system manufacturers produce equipment and software with hundreds of settings and, while they hold training courses on how to adjust these settings, there is as yet no integrated instruction on when or why. Despite rapid growth in the greenhouse industry, growers are still faced with a multitude of variables and no unifying framework from which to choose the best option. Consolidating 30 years of research in greenhouse climate control, Optimal Control of Greenhouse Cultivation utilizes mathmatical models to incorporate the wealth of scientific knowledge into a feasible optimal control methodology for greenhouse crop cultivation. Discussing several different paradigms on greenhouse climate control, it integrates the current research into physical modeling of the greenhouse climate in response to heating, ventilation, and other control variables with the biological modeling of variables such as plant evapo-transpiration and growth. Key topics include state-space greenhouse and crop modeling needed for the design of integrated optimal controllers that exploit rather than mitigate outside weather conditions, especially sunlight, given widely different time scales. The book reviews classical rule-based and multivariable feedback controllers in comparison with the optimal hierarchical control paradigm. It considers real and hypothetical examples including lettuce, tomato, and solar greenhouses and examines experimental results of greenhouse climate control using optimal control software. The book concludes with a discussion of open issues as well as future perspectives and challenges. Providing a tool to automatically determine the most economical controls and settings for their operation, this much-needed book relieves growers of unnecessary control tasks, and allows them to achieve the best possible trade-off between short term savings and optimal harvest yield.


Introduction and Problem Statement Greenhouse-Crop Cultivation-Benefits and Challenges Automatic Control Elementary Description of the Greenhouse-Crop System Measurements and Instrumentation Decomposition, Fluxes, and Information Flows General State-Space Representation Hierarchical Computerized Control Current Status of Computerized Control How Is This Book Organized?. Reference Introduction to Optimal Control of Greenhouse Climate Introduction and Motivation A Simple Illustrative Example General Formulation of Optimal Control Problems Benefits and Difficulties Associated with Optimal Control Open-Loop Optimal Control Introduction Optimal Control Theory Optimal Control Algorithms References Closed-Loop Optimal Control Introduction State Estimation Linear Quadratic Feedback Control References Greenhouse Cultivation Control Paradigms Introduction Optimal Control Revisited Earlier Surveys of Greenhouse Climate Control Solutions Classification of Proposed Greenhouse Climate Control Solutions Discussion and Conclusion References A Seminal Case: Lettuce Introduction Models The Optimal Control Problem Optimal Control Case Studies Concluding Remarks References An Experimental Application: Tomato. Introduction Tomato Model Greenhouse Climate Model State-Space Form of the Complete Greenhouse-Crop Model Calibration and Model Results Open-Loop Optimization Two-Time-Scale Receding Horizon Controller (RHOC) Evaluation of Optimal Control Assessment of Economic Result as Compared with Conventional Control Discussion and Conclusions References An Advanced Application: The Solar Greenhouse. Introduction Description of the Solar Greenhouse Concept System Description The Solar Greenhouse Model Model of Crop Biophysics Sensitivity Analysis, Calibration, and Validation Optimal Control References Appendices Developments, Open Issues, and Perspectives Introduction Developments in the Greenhouse Industry and Consequences for Control Prerequisites for Future Control Systems Challenges for Science and Technology Showstoppers for Optimal Control Conclusions and Perspectives References

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