Design And Implementation Of Plant Factory Light Supplement System And Adaptive Control

In recent years,global food production has been affected by shrinking arable land and extreme weather.The facility agriculture is favored by more and more agricultural workers because it is not affected by terrain,climate and other conditions.Plant factories use artificial light sources,which can be controlled in real time according to the light quality,light intensity,photoperiod and other lighting parameters,solve the environmental factors that are not controlled by natural light in outdoor planting,supplemented by regulation devices,to achieve high efficiency and high quality planting of crops.In order to meet the demand for plant fill light in plant factories,this paper improved the existing plant fill light technology,improved the structure and arrangement of lamps by combining optical design and thermal design,and realized the adjustment of optical parameters through the design of control system.Finally,it was applied in actual production,and completed a set of efficient and practical plant fill light system.To meet the lighting needs of plant factories.By analyzing the photosynthesis principle of plants and the specific influences of light quality,light intensity and photcycle on plants,this paper summarizes the key light parameters affecting plants,and determines the power threshold of the supplementary light system to be designed according to the light energy utilization efficiency and electric energy utilization efficiency.Combined with the characteristics of LED light source,the size,light distribution,power and other parameters of the designed plant fill light equipment are determined.According to the calculated size,equal scale modeling is carried out,and optical simulation and thermal simulation are used to optimize the design,so as to find the best design parameters,save research and development costs,and increase the effect of filling light.STM32 is used as the main controller of this system,STC MCU is used as PWM signal generator,modularized design and constant current driven way to complete the regulation of LED light quality and light intensity,improve the flexibility of the circuit,convenient later expansion.After design,the plant fill light system can complete the adjustment of light quality,light quantity and photcycle,the user can realize the change of light quality 0:10～10:0 on the touch pad,and the lighting performance of the plant fill light lamp is measured according to the actual application situation.After the completion of the overall system design,the performance of the plant supplementary light system was tested,and the designed system was applied in cucumber seedling cultivation in plant factories.By adjusting different light quality and intensity,the growth state of the seedlings was observed respectively.According to the measured growth amount and photosynthetic characteristics,the ratio of red light and blue light was found to be 7:3,the optimum growth condition was obtained when the light intensity was 2808)7)·8)^-2·^-1.Determine the most important light parameters that affect plants,and accumulate data basis for the upgrade of plant supplementary light system in the later period.In this paper,the illumination uniformity and interlayer air flow of plant fill light lamps are improved by optical and thermal optimization design,and the overall performance of plant fill light system is improved.This system was used to cultivate cucumber seedlings,and the optimum light quality ratio and light intensity required for cucumber seedling growth was explored.This paper provides some suggestions for the design of the filling light system in plant plant production and also provides alternative data for the design of the optical parameters of plant filling light.