Abstract
Starting from a descriptive plant-physiological model of the growing cucumber, greenhouse climate strategies are developed by means of nonlinear optimization. For this, the descriptive model has been approximated by a simplified time-variant nonlinear dynamic input-output control model. Contrasted with a former version other model in-puts have been chosen. Especially, the global radiation is now an explicit input. A hierarchical control structure with strategic and operative layer allows to take into consideration Apriori-and actual information on the outer climate by means of repetitive optimizations with different repetition periods at the upper and lower layer. Results of simulation runs and greenhouse tests will be reported.
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