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Facility agriculture is regarded as a dynamic new rural industry in this century. It represents the development direction of modern agriculture in the world. Facility agriculture is an important pillar of China's agricultural development today, but facility agriculture is an industry with high input and high output. Its high investment is not only reflected in the construction of complete sets of equipment. Its high energy consumption is a more important aspect of our facility agriculture. According to incomplete statistics, the energy cost of large-scale heating greenhouses accounts for 35% to 65% of the operating costs of the entire facility (and does not include the energy required to cool the greenhouse in summer). The electricity consumption of greenhouses in the Netherlands accounts for 10% of the total electricity consumption of natural gas in the country, and the cost of greenhouse heating facilities accounts for about 26% of the total investment in greenhouses. In Japan, 5 liters of oil are consumed for every 10 kg of cucumber, which is more than the energy produced by food production. Consumption is 50 ~ 60 times higher. However, in our country, energy costs even account for more than 50% of total production costs. In the world, 30% of the energy consumed in one year's agricultural production is used for heating the greenhouse. The cost of energy consumption alone accounts for 14% to 40% of the total cost of greenhouse crop production.
In general, with the vigorous promotion of digital intelligent agricultural production in China, environmental regulation has become an important means to increase production and improve the benefits of crop planting, improve the effectiveness of greenhouse environmental monitoring, reduce the cost of greenhouse energy consumption and is A major important direction of research. The intelligent greenhouse temperature and humidity control system designed by Chengdu Xinxin Electronic Technology Co., Ltd. can increase the temperature of the same period from 20.0 ℃ to 21.0 ℃ and reduce the total energy consumption by 34%.
Design of a greenhouse environmental monitoring system
In recent years, because the energy consumption of greenhouses accounts for a large proportion of costs, most companies can start from the aspect of saving greenhouse energy consumption when researching and designing greenhouse temperature and humidity control systems . Improve. Improving the performance of the control system has also become an important research area. When they designed the greenhouse temperature and humidity control system, they embedded many new control algorithms and achieved good results. The design of these systems is increasingly centered on the appropriate environment for plant growth and overall design.
2 Algorithm aspects of greenhouse environmental control
From the PID algorithm used in the early days, the temperature control accuracy can reach about ± 0.2 ° C, to the multivariate comprehensive control method that takes into account the comprehensive effects of the growth environment such as temperature, humidity, light intensity, and CO2 concentration in the greenhouse, and to incorporate some new algorithms. The controller, such as the fuzzy control of the temperature in the greenhouse, the fuzzy control dynamic deviation is 1.5, and the static difference of the heating system is 0.5 ° C. Subsequently, a genetic optimization fuzzy controller was introduced, which can automatically modify the control algorithm according to changes in the greenhouse structure and crop growth conditions, and the effect is significantly improved. These algorithms that we use, such as fuzzy control algorithms, genetic algorithms, neural network control algorithms, control algorithms of agricultural expert systems, etc., can effectively improve the accuracy and efficiency of the control system.
3 Greenhouse environmental control hardware
The early greenhouse temperature and humidity control system used a simple single-chip microcomputer control system. If a certain link of the system fails, the entire system will no longer work. The medium-term greenhouse temperature and humidity control system uses a greenhouse control system based on an industrial control machine (IPC). All input and output functions of this system are centralized controlled by IPC. Its equipment focus is too concentrated. Once the brain-industrial control machine occurs Failure will paralyze the entire system. Later, a PLC-based greenhouse control system was developed, which can realize the distributed control of multiple PLCs and multiple greenhouse environmental parameters-that is, a distributed control system. The embedded Linux system we have developed in recent years can improve the performance of greenhouse systems, reduce the difficulty of system development, and meet the increasing complexity of greenhouse computer control systems. This is the main direction of the development of greenhouse control systems.
Under the premise of the development of network technology, modern greenhouses are developing in the direction of automation, intelligence, multimedia and networking. Chengdu Xinxin Electronic Technology Co., Ltd. will do its best to bring the greenhouse temperature and humidity environmental monitoring system in China to the world and benefit the people of the world.
July 8, 2015
Chengdu Xinxin Electronic Technology Co., Ltd. Editorial Department
Editor: Little Devil in Gourd