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۱A Fuzzy Logic Based Approach for Integrated Control of Protected Cultivation
اطلاعات انتشار: World Applied Sciences Journal، بيست و چهارم،شماره۵، ۲۰۱۳، سال
تعداد صفحات: ۹
This study presents a fuzzy logic–based control system for controlling the protected cultivation and describes its advantages over the traditional greenhouse automationcontrol systems. In terms of systems theory, the greenhouse represents a complex nonlinear system with emphasized subsystem interactions. Applying a nonlinear control encompasses a number of difficulties due to incomplete knowledge of system dynamic. System decoupling is used in order to obtain simplified control structures for independent control loops. This gives limited results due to strong interaction between system variables and such control system does not allow optimization of system behaviour primarily in terms of energy efficiency and\or water consumption. We present a design of fuzzy logic–based controller, which optimizes the greenhouse energy and water consumption. The design includes the main linguistic variables for sensor and actuator subsystems. Membership functions of Fuzzy Inference System (FIS) are generated and simulation and analysis of the behaviour of the designed control system is performed.The result shows that the designed control system beside its relative simplicity is flexible and adaptive,taking into accountthe differences in crop varieties and growth stages. Preliminary simulation of energy savings compared with the costs on actual field shows also good results. Still, number of different control strategies has to be applied in order to increase system flexibility regarding the different varieties.
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