Marko Andrić

Temperature control in automated greenhouse

This thesis concerns with implementation of temperature control in automated greenhouse. By using a physical approach, a mathematical model of the thermal system is created and implemented in MATLAB and Simulink to obtain simulation results. While adjusting the simulations parameters of the heating system, optimal system components and parameters were selected by trial and error. Heating control is designed by using a PI controller, while hysteresis controllers are designed for the cooling system. Control system is finally implemented in PLC, by using analogue inputs and outputs that secured full system functionality in any weather conditions. Finally, human–machine interface enabled personalized selection of system parameters.

Keywords: automated greenhouse, temperature control, human-machine interface, PI regulator, PLC, hysteresis