| 基于Fuzzy-Smith控制器的营养液pH值调控系统研究 |
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| 引用本文： | 李帅帅,李莉,穆永航,王宏康,吴勇,SIGRIMIS N.基于Fuzzy-Smith控制器的营养液pH值调控系统研究[J].农业机械学报,2017,48(S1):347-352， 393. |
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| 作者姓名： | 李帅帅 李莉 穆永航 王宏康 吴勇 SIGRIMIS N |
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| 作者单位： | 中国农业大学,中国农业大学,中国农业大学,中国农业大学,中国农业大学,雅典农业大学 |
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| 基金项目： | 国家重点研发计划项目（2016YFD0201000-2016YFD0201003）和云南省汪懋华院士工作站项目（2015IC016） |
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| 摘 要： | pH值的控制是水肥一体化营养液循环控制系统的重要环节，水肥控制过程中pH值在最优控制范围内有利于根系的发育以及多数矿物质的吸收。营养液调控过程中，由于循环管路以及酸液的缓慢扩散，使得pH值调节过程存在很大的时滞，传统PID难以取得良好效果。本研究根据被控对象特点，建立了描述该过程的数学模型，设计开发了一套具有二次混肥特性的以MSP430单片机为主控的营养液pH值控制系统。由于参数自整定模糊PID不需要精确数学模型以及Smith预估可对纯滞后进行补偿的特点，开发的系统将参数自整定模糊PID控制引入Smith预估当中，既缓解了滞后时间对控制系统的影响，又对模型的不精确性进行了补偿。为了验证该算法以及系统的有效性和优越性，分别对PID、Fuzzy-Smith控制算法进行仿真测试，同时在不同灌溉量下进行性能试验。试验结果表明，在不同灌溉量下Fuzzy-Smith控制算法pH值的平均最大超调量为0.83%，营养液pH值从8.0调节为6.0的平均时间为157s，优于常规PID控制的2.55%和189s。
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| 关 键 词： | pH值调控 Fuzzy-Smith控制 二次混肥 水肥一体化 灌溉 |
| 收稿时间： | 2017/7/10 0:00:00 |
pH Value Control System of Nutrient Solution Based on Fuzzy-Smith Controller |
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| LI Shuaishuai,LI Li,MU Yonghang,WANG Hongkang,WU Yong and SIGRIMIS N.pH Value Control System of Nutrient Solution Based on Fuzzy-Smith Controller[J].Transactions of the Chinese Society of Agricultural Machinery,2017,48(S1):347-352， 393. |
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| Authors: | LI Shuaishuai LI Li MU Yonghang WANG Hongkang WU Yong and SIGRIMIS N |
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| Institution: | China Agricultural University,China Agricultural University,China Agricultural University,China Agricultural University,China Agricultural University and Agricultural University of Athens |
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| Abstract: | The control of pH value is an important part of water and fertilizer integrated nutrient solution circulation control system. In the process of water and fertilizer control, pH value in the optimal control is conducive to the development of root system and absorption of most minerals. In the process of nutrient solution regulation, due to the slow diffusion of the circulating line and acid fluid, the pH adjustment process has a large time lag, and the traditional PID is difficult to achieve good results. According to the characteristics of the controlled object, a mathematical model describing the process was established, and a pH control system with secondary mixed fertilizer was designed. Combining with the characteristics of parameter normal setting, the fuzzy PID does not need accurate mathematical model and the Smith predictor can perform the pure lag compensation, the parameter self-tuning fuzzy PID control was introduced into Smith prediction, which can overcome the influence of lag time on control system and improve the accuracy of the model. In order to verify the algorithm and the effectiveness and superiority of the system, the PID and Fuzzy-Smith control algorithm were simulated respectively, and the performance tests under different irrigation quantities were carried out. The experimental results show that the average maximum overshoot of pH value under Fuzzy-Smith control of different irrigation amounts is 0.83%. The average rise time of nutrient solution from pH value 8.0 to 6.0 is 157 s. It is better than the conventional PID control result which is 2.55% and 189 s. The Fuzzy-Smith control algorithm proposed in this paper has good control stability and dynamic performance, and can meet the requirements of automatic control of pH value of nutrient solution. |
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| Keywords: | regulation of pH value Fuzzy-Smith control two-step fertilizer mixing integration of water and fertilizers irrigation |
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