Double closed-loop optimal control of greenhouse cultivation. (April 2019)

• Record Type: Journal Article
• Authors: Xu, Dan; Du, Shangfeng; van Willigenburg, Gerard
• Is Part Of: Control engineering practice. Volume 85(2019)
• Page Start: 90
• Page End: 99
• Publication Date: 2019-04
• Subjects: Optimal control -- Greenhouse cultivation -- Time-scale decomposition -- LED lighting -- Double closed-loop; Automatic control -- Periodicals; 629.89
• DOI: 10.1016/j.conengprac.2019.01.010
• Languages: English
• ISSNs: 0967-0661

Abstract

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.