Simulation and fuzzy control of greenhouse microclimate based on Simulink

This paper deals with the problem of controlling greenhouse environment defined by the temperature and humidity. According to the thermal balance principle and water vapour quality balance principle of greenhouse, two non-linear differential models each for air temperature and humidity inside greenhouse were constructed. The corresponding fuzzy controller for greenhouse environment was set up by using the ANFIS tools of MATLAB, including the choosing of variables, quantification of the domain, definition of fuzzy sets, choosing of membership functions and controller training. After the combination between controller and the controlled object by Simulink, simulation was carried out to analyse the performance of control system. The simulation results testify the validity and reasonability of the fuzzy control strategy for the environment control in the greenhouse, and the achievement has certain reference value for the development in intelligent control of the greenhouse microclimate.