模糊PID控制在温室环境中的应用

Application Fuzzy PID Control in the Greenhouse Environment

目前大部分温室控制方法都需要建立比较精确的数学模型,但温室内参数变化的非线性特性使建立的模型精度受到一定的影响;而模糊控制技术不需要建立精确的数学模型,解决多变量非线性系统具有明显的优点。为此,针对温室环境的多变量、非线性和难建模等特性,将模糊控制与PID控制的优势相结合,实现了对温室环境参数的有效控制。该系统的各项性能指标良好,遇到干扰可以进行自我调整,具有一定的自适应性。仿真结果表明,模糊PID控制算法不但简单实用,而且响应速度快,超调量小,控制效果良好。

At present most of the greenhouse control methods need to establish more precise mathematical models,but the nonlinear characteristics of parameters change in greenhouse affect the accuracy of model,while the fuzzy control technique does not require a precise mathematical model,so it has obvious advantages to solve multi-variable nonlinear system.In the light of the features of greenhouse environment,such as multi-variable,non-linear,hard to modeling,this paper combines the advantages of the fuzzy control and PID control to achieve the effective control of greenhouse environmental parameters.The performance of the system is good,it can be self-adjustment when encountering interference,it is self-adaptive in a certain degree.The simulation results show that the algorithm of fuzzy PID control is not only simple but practical,and fast response,small overshoot,good control.