Design Of Controlling Syetem For Agricultural Greenhouse Supported By Multi-energy System

Aiming to handle the existing problems of agricultural greenhouse in Qiqihar of Hei Longjiang Province, such as the high cost of heating, inconvenient for electricity, trouble to layout monitoring wirings and occupying too much land resources and so on, But the use of wireless sensor technology, embedded technology and fuzzy control algorithm can well solve the problem of agricultural greenhouses. It has designed controllable agricultural greenhouse supported by multi-energy system, taking into account the rich natural resources of solar energy and wind power in Qiqihar, with which has distinct regional characteristics.The use of wireless sensor technology, embedded technology and fuzzy control algorithm to solve the problem of agricultural greenhouses, a controllable a syetem for agricultural greenhouse supported by multi-energy system is designed and implemented. It mainly include: more energy supply system for agriculture greenhouses, control algorithm design and implementation, design of Zigbee nodes, development of ARM terminal applications and design of Qt interface.At first, the paper introduces the overall design. It has built a multi-energy supply system of agricultural greenhouses. In order to meet the basic electricity demand of greenhouses without commercial electricity, it has constructed system of photovoltaic, wind power generation, energy storage basing on circulating water and biogas system, making proper use of the surroundings, for example the abundant solar and wind resources. Beyond that, the system adds LED lighting system suiting crops growth. Then, Agricultural greenhouse is difficult to control with strong coupling, dominant time delay, and time-lag characteristics. For this special case, the system adopts fuzzy self-adjusting PID control algorithm. As a result of MATLAB simulation and comparison, the simulation curve presents good dynamic and steady-state response, realizing better control of parameters.After this, date acquisition of environmental information in agricultural greenhouse is accomplished via wireless sensor network, to control environmental parameters(including temperature, humidity, light, etc.). ARM terminal eventually receives the environmental information and processes the data through fuzzy self-adjusting PID control algorithm. Control commands are sent according to recognition results. The embedded platform is built and development of ARM applications, it can achieve the control of node. Date storage and viewing is realized through small database of SQlite, and then to draw a graph based on the data which has collected. It can view the current environmental data for each node through UI interface on the ARM terminal timely, which will enhance interactivity and intelligence of the system. The each device in system can be controlled manually or automatically.At last, the testing result indicates that the system shows a good performance in all aspects for actual agricultural greenhouse. The expectant design aim is fulfilled at energy supply and control that the system provides an optimal environment for the crops. It has important applications for the construction of new energy and intelligent agricultural greenhouses in the area of Qiqihar.