Abstract
Greenhouse climate control can be described as a hierarchical control system with three levels. Applications for automatic control in greenhouses are given on the bottom level and on the middle level. On the bottom level feedback - feedforward control with adaptive control algorithm and an on-line estimation of the model parameter is used for controlling the greenhouse environment. On the middle level with an online optimization of plant production the set-points for the bottom level are calculated. Plant growth models and economic models for optimization are necessary for optimization. The plant growth models describe the reaction of plants on changing environmental factors. A feedback from the plants gives the possibility for an on-line adaption of model parameter and the accuracy of optimization will increase. Several methods have been developed and tested to measure “plant growth”. The top level is the level of production planning and farm management. Set points for plant production and decision rules for optimization on the middle level are the output of this level.
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