温室环境控制方法研究现状分析与展望

    Analysis and prospect of the environmental control systems for greenhouse

    • 摘要: 环境控制方法是实现温室蔬菜高效生产的关键。随着现代控制技术的快速发展,温室环境控制方法逐步从手动、定时控制方法,转变为设定值控制和智能控制等方式。该文概述了以设定值为目标实现环境控制的方法,归纳了模糊控制、解耦控制、人工智能控制和表型控制等智能控制方法的特点,总结了现有温室环境调控领域控光、控温、控气、通风、灌溉和“云-边-端”协同控制系统的优劣。针对现存问题,指出该领域的发展趋势为构建考虑扰动因素影响的温室环境控制方法,研制基于作物生长和表型评价体系的环境调控模型,以及建立多模型融合的“云-边-端”协同温室环境调控系统。相关技术的发展将为温室的智能化与信息化发展提供重要的决策依据和借鉴意义。

       

      Abstract: Facility agriculture is one of the most important indicators to achieve efficient and high-quality crop production in modern agriculture. Optimal environmental parameters can also be adjusted to improve crop growth, yield, and quality in the greenhouse. Therefore, environmental control and regulation technologies have been widely used to achieve efficient vegetable production. This review aims to summarize the recent research status in the field of environmental regulation in greenhouses. New approaches were also proposed for future research priorities. Greenhouse environment system was gradually shifted from the manual and timed to the threshold, feedback, and intelligent control systems, with the rapid development of artificial intelligence (AI) technology. Firstly, the main properties of different control systems were evaluated from an application perspective. Among them, the threshold control was simple and widely used, but it failed to adjust the control strategy in time following the dynamic changes of the external environment, in order to meet the needs of crops for light, water, and nutrients. The feedback control shared the stable environment through feedback regulation but was unsuitable for the complex multivariable conditions. Intelligent control was widely used to balance the interaction between different environmental factors in modern greenhouses. Afterward, the intelligent control methods were investigated for greenhouse environments, including fuzzy, decoupling, neural network, and environmental control, according to the crop phenotype parameters. Specifically, the mathematical model was independent of the controlled object in the fuzzy control, and easy to handle with nonlinear issues. However, the outline fuzzy was difficult to handle the sudden disturbances in the regulation system. In decoupling control, the appropriate control strategies were designed to transform the multiple parameters with coupling effects into a single variable. The regulation model was also constructed to integrate the multiple environmental factors and crop physiological needs. The intelligent control of the environment was realized in the development of greenhouse agriculture. The Neural networks were used to extract valuable information from a large amount of greenhouse environment data, thus providing powerful tools for the regulation models. The intelligent models mainly included single-factor, multi-factor, and multi-objective environment regulation. The data-driven method was one of the research hotspots in the intelligent regulation of greenhouse environments. However, the universality and economic benefits were the key limiting factors of regulation models. Efficient and accurate acquisition of phenotypic parameters greatly contributed to the fine management of greenhouse environments, indicating the intuitive, real-time monitoring, and dynamic regulation. However, it was still lacking in the interaction between phenotype and multiple environmental factors, which failed to apply directly in greenhouse production. In addition, the existing environmental control systems were evaluated for the light, temperature, air, ventilation, and irrigation greenhouse. Research directions were proposed to urgently improve and optimize the control system. Finally, future research and development trends were also recommended to construct the greenhouse environmental regulation, considering disturbance factors. Environmental regulation models were developed using crop growth and phenotype evaluation. A "cloud-edge-end" system of greenhouse environmental regulation was established to integrate multiple models. This finding can provide new ideas and references for the subsequent development of environmental control systems in greenhouses.

       

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