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| Control strategy for precision water-fertilizer irrigation system and its verification |
| ZHANG Yubin1,2, WEI Zhengying1, ZHU Xinguo3, HU Yang3, LI Linzhang4 |
| 1.Ningbo Dahongying University, Ningbo, Zhejiang 315175, China; 2.Xi′an Jiaotong University, Xi′an, Shaanxi 710054, China; 3.Bureau of Water Resources of Ningbo Municipality, Ningbo, Zhejiang 315175, China; 4.Ningbo Agricultural Science Research Institute, Ningbo, Zhejiang 315175, China |
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Abstract For the precise control problems of water and fertilizer solution concentration in the process of agricultural irrigation, the precise irrigation control system was developed based on PID control technology, the application of conductivity EC value and pH value control technology. We performed open-loop step response experiments and relay oscillation adjust experiments. The results showed that the system is nonlinear, inertial, and hysteretic. We also performed theoretical and experimental study on digital PID control for EC control. The results indicated that the PID controller has the advantage of high control accuracy, and some time has the disadvantage of performing badly when the fertilizer solubility changed considerably. Adopting open-loop step response theory, PID control and fuzzy control, we designed the intelligent PID controller. The results showed that the controller is auto-tuning of PID parameters, the settling time is 3 minutes, accuracy is within ±0.15 mS/cm, and overshoot less than 15%. With the combination of open-loop step control and PID control, we designed an alternative PID controller for pH, and experiments proved that it has some fine performance as mentioned above.
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Received: 01 March 2017
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