CONSTRAINED GA PI SL IDING MODE CONTROL O F INDOOR CLIMATE COU PLED MIMO GREENHOUSE MODEL

Abstract

High accuracy trajectory trackingwith constrained inputs is challenging topic in greenhouse indoorenvironment control. This is due to nonlinearities and inputs/outputs coupling present in physical model ofgreenhouse. The objective of this study is about the problem of identification and control of a Multi Input MultiOutput (MIMO) greenhouse process. Proportional Integral (PI) and sliding mode controllers (SMC) are used inconjunction so that estimated outputs tracks desired trajectories with good performance as near as possible in spite ofcoupled dynamics and outside disturbances climate. To reflect the practical aspect, the constraints of the process andcontrol elements were taken into account .The results demonstrate the feasibility of PISMC control method.Simulation has been done i n the environment of Matlab and Simulink; it shows that combined controllers are capableto manage successfully the microclimate of greenhouse.