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A Multi-Objective Compatible Control (MOCC) Algorithm for the Greenhouse Energy-Saving Control

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2007 ASAE Annual Meeting  073022.(doi:10.13031/2013.22944)
Authors:   Lihong Xu, Qingsong Hu
Keywords:   Greenhouse, Energy-saving, Multi-objective Control, Compatible

Energy-saving control is very important in the greenhouse environment control. However, the greenhouse is a very complex system and the users have multiple objectives, there are few suitable control methods to realize this by now. In this paper, a new two-layer multi-objective compatible control algorithm is proposed for the greenhouse control problems with two conflicting control objectives, control error and energy consumption. The first layer is devoted to obtaining a user’s desired controlled objectives region, assured to be not only achievable but also Pareto-optimal. The second layer is devoted to designing an effective controller by optimizing the most important controlled objective --- energy consumption, subject to system constraints from the controlled objectives region in the first layer. This control algorithm provides an effective robust controller design method for the complex greenhouse energy-saving control with precise models and uncertain initial conditions. Simulations illustrate that the two-layer multi-objective compatible control (MOCC) algorithm has some advantages on energy-saving over traditional multi-objective control methods.

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