基于奇异摄动理论的综合温室控制系统设计

为了建立集环境因子、作物生长过程和上层指标的综合温室控制系统,分析了现有温室控制研究成果,基于控制周期原则将温室控制系统分为分钟级温室环境因子控制系统(快速时变系统)、天或旬级的作物生长周期控制系统(中速时变系统)、年级的温室上层指标控制系统(慢速时变系统)。通过多时间尺度分析发现3类控制系统具有多时标特性,借助奇异摄动理论,对温室控制系统进行了分层递阶设计,进而得出该理论下的总体温室控制系统模型与控制器求解过程。通过算例演绎该设计方法的步骤,进行了仿真研究,结果表明,基于奇异摄动理论的温室控制系统设计思路清晰、计算量小、易于工程实现。

Greenhouse Control System Design Based on Singular Perturbation Theory

In order to set up an integrated greenhouse control system including environmental factors, plant growth period and upper index, relevant literatures of greenhouse control system were analyzed and based on control period principle, the literature was divided into three types of control systems: greenhouse environmental factors control system (fast speed time-varying systems), crop growing period control system (middle speed time-varying systems) and upper index control system in year (slow speed time-varying systems). By the multi-time-scale analysis, three types of control systems were found out to have multi-time-scale property. By means of singular perturbation theory, the greenhouse control system was designed hierarchically at first, and then the overall model of control system of greenhouse and the solution of the controller were obtained within such theoretical framework. Finally, the example and simulation results show that the proposed method is simple, effective and convenient for the application.