The Research Of Automation And Optimization Control In Water-saving Irrigation

With the rapid development of agricultural modernization, the unceasing enhancement of the automation level of water-saving irrigation, the applied study of agricultural water-saving irrigation automation system has practical significance. This subject based on the project of Lake Tai rice demonstration garden, Xishan District, Wuxi City, designs intelligent water-saving irrigation system.According to functional requirements of intelligent irrigation system, the system is the combination of unit configuration software, programmable logic controller (PLC), field detection instrument using advanced communications network technology, through to the automatic detection of unit running state and parameter, realizing automatic optimization control with fault alert and emergency handling ability; Through to the collection of plant growth parameters and meteorological parameters, providing the basis for intelligent irrigation decision.This disertation first introduces the present situation and trend of water saving irrigation automation of the domestic and foreign development, then Lake Tai rice demonstration garden, Xishan District, Wuxi City on the analysis of the actual demand to determine the main function of the intelligent water-saving irrigation system and the design scheme. The system uses a hierarchical system structure, according to the function, is divided into three layers:the measurement and control of pump station, data processing, and remote supervisory control center.PLC as the main equipment, measurement and control unit through Ethernet communication will transmit pump valve running status information, as well as real-time information collected by a variety of sensors to the control center server, and measurement and control unit can accept the oversight of the remote control command from the control layer, so as to realize the remote control of pump valve equipment; Center data processing layer has a SCAD A Server, with the SCADA client side of remote supervision and control layer making up the PC monitoring system of C/S (Client/Server, Client/Server) architecture; Remote supervisory control layer has a SCADA Client, on the SCADA Client can realize online monitoring and remote configuration of system. Remote supervisory control layer also has video workstations, through on-site HD camera catching key equipment operating states, in addition to the intelligent irrigation system. Through the wireless spread spectrum network connecting the new and old pump station to SCADA server, the server via industrial Ethernet are connected to the video workstation and monitoring workstation of the control center, forming a complete irrigation automatic control system.For plant growth and meteorological patch collect more and dispersed, and in the measurement area underground large embedding sensor lead, vulnerable to farming and other man-made destruction, repair and maintenance difficult, using the advanced Internet technology, construct wireless sensor networks. Based on constant pressure, energy saving and safety consideration at the same time, the traditional PID algorithm was adopted to design a kind of optimal control policy adjustment, realizing frequency conversion, velocity modulation, constant pressure of water supply of rice irrigation system.