| Because of serious drought in many areas, people pay more and more attention to food security issues in recent years. Rice is one of the most important food crops, the volume of rice irrigation water is very large, and so the research on efficient automated intelligent rice irrigation technology has a very important practical significance. Few application field of smart irrigation control technology in China, this paper focuses on the research field of intelligent monitoring system of rice regulated deficit irrigation in cold region, which achieves a high yield and quality of rice and save water at the same time. The paper is in Heilongjiang farming cultivate bureau issue" rice Honda modernization management system research" support of the completion of.Fuzzy-PID intelligent monitoring and control system of regulated deficit irrigation of rice in cold region includes administrative level, control level and device level, three-level structure of decentralized control and centralized management. According to the technical requirements of regulated deficit irrigation on rice, the real-time system collects data of water, soil moisture, processes the data with irrigation Fuzzy-PID algorithm, and accurately irrigates rice by controlling the pump and electric switch timely. Device level is in charge of collecting related data and precision control of irrigation water in due time. Control level includes more than one sub station, slave PLC is the core of the sub station, implements on the device-level control and uploads the preliminary processing of various data to the administrative PC, and follows management level instruction and controls the electric switch at the device level, each sub station is equipped with a touch screen for manual control. Management level is the highest level of system, PC selected DELPHI programming language as friendly human-machine interface, with the following features:people can set rice growing period and system parameters on the interface; Real time monitoring data such as water, soil humidity and irrigation water volume; Remote manual operation each electric switch; fault alarm with sound alarm and light alarm; data reporting. Wireless communication is used between the management level and control level.For irrigation control that has large lag, nonlinear, time-varying control object, simply by PID control and fuzzy control can obtain better control effect. Rice irrigation control system controlled by Fuzzy-PID way, it can make a strong robust fuzzy control, better dynamic response characteristic, fast rise time, small overshoot, achieve the quality of dynamic tracking and steady-state precision which is the same as PID controller. Therefore in the irrigation controller design, using a PID parameter fuzzy self-tuning PID compound control to achieve online self-adjusting features of PID parameters, further improve the performance of Adaptive PID control. This system error e and error change rate ec of soil moisture as input variables, output control to control the electric valve opening and closing state, the electric valve to maintain the original state, converted from stop to start and to stop from the start conversion.There are three control methods in this system:automatic control, remote control and manual control. In automatic control, data is processed by the Fuzzy-PID control algorithm for electric switch control, and the other two methods are implemented according to the actual situation by a technical staff. This paper describes the system hardware design, software design, development and testing, practical application at Shengli farm Science Park in Heilongjiang reclamation area has achieved good results. |
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