MODELING AND PIP CONTROL OF A GLASSHOUSE MICRO-CLIMATE

The paper discusses the modelling and control of the climate in a hort icultural glasshouse system. A linear, reduced order, control model is obtained using identification and estimation techniques applied to a multivariable, nonlinear simulation model of the glasshouse microclima te. This control model is then used as the basis for the design of Pro portional-Integral-Plus (PIP) control systems which regulate the level s of the major climate variables in the glasshouse. Finally, full mult ivariable extensions of this glasshouse control system design methodol ogy are discussed and evaluated.