Double closed-loop optimal control of greenhouse cultivation |
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| Affiliation: | 1. Key Laboratory on Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing 100083, China;2. Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture, China Agricultural University, Beijing 100083, China;3. Dept. of Agricultural Engineering, Institute of Soil & Water Resources, Hellenic Agricultural Organization “Demeter”, Athens, Greece;4. Agricultural University of Athens/Geosmart Spinout, Iera Odos 75, Athens, Greece |
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| Abstract: | Two time-scale receding horizon optimal control (TTRHOC) of greenhouse cultivation is investigated. Recent developments enable closure of the outer-loop of this control system because they facilitate on-line recomputation of the optimal control of the slow dynamics on a daily basis. This paper quantifies the benefits obtained from having an outer closed-loop that counteracts errors and changes concerning predictions of crop growth, long-term weather, revenues obtained from selling crops and costs to control greenhouse climate. As a special, important case LED lighting is considered which increases both crop growth and profit. Having an outer closed-loop is especially beneficial in this case. |
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| Keywords: | Optimal control Greenhouse cultivation Time-scale decomposition LED lighting Double closed-loop |
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