一种基于云模型的水肥配比控制策略

Water and Fertilizer Integration Control Strategy Based on Cloud Model

针对水肥配比控制精度低以及控制方法对于被控系统动态变化适应性弱的问题,开展了水肥配比控制策略设计,构建了基于云模型的模糊PID控制方法,能够有效改善传统PID控制对被控系统动态变化适应性较弱的问题,实现了根据输入值的动态变化对PID控制参数的实时修正。最后通过试验验证了方法的有效性,表明将基于云模型的模糊PID控制方法用于水肥配比控制可以快速调节肥液流速,缩短水肥比例调控的时间,实现根据由水压等原因导致水流速的变化来动态调节肥液流速,使得系统按照理想的水肥比例将水和肥同步灌溉到作物,具有较好的应用前景。

Aiming at the problems of low precision of water fertilizer ratio control and weak adaptability of control method to the dynamic change of controlled system,we designed the control strategy of water fertilizer ratio.The fuzzy PID control method based on cloud model was proposed,and the real-time correction of PID control parameters was realized according to the dynamic change of water fertilizer ratio.The effectiveness of fuzzy PID control method based on cloud model was verified by experiments.Results showed that the fuzzy PID control method based on cloud model could quickly adjust the fertilizer flow rate,shorten the time of water fertilizer ratio regulation,and dynamically adjust the fertilizer flow rate according to the change of water flow rate caused by water pressure and other reasons,so that the system could synchronously irrigate the water and fertilizer to the crops according to the water fertilizer ratio.