试验温室温度系统建模与仿真

Experiment Greenhouse Temperature System Modeling and Simulation

温室小气候具有强非线性、大时滞、强耦合、强干扰、时变等特点。为更好地设计温室小气候计算机监控系统,需要对其建模和仿真,以便比较控制方案、检验控制算法。在分析温室温度系统机理模型的基础上,选择MISO的ARIMAX模型描述温度系统,根据试验温室实测数据,采用"统计假设检验"和"模型拟合度检验"相结合的方法确定模型结构,通过递推增广最小二乘法估计模型参数,并进行了仿真研究。

Greenhouse microclimate has the characteristic of strongly nonlinear, large time delay, severe coupling, greatly disturbed by noise, time-varying, etc,. Building simulation and prediction model of the greenhouse microclimate system helps to test control algorithm before realization, and to compare different control schemes in design computer-based greenhouse microclimate control system. The mechanism model of the greenhouse inside temperature system was analyzed, and then the greenhouse inside temperature system was described by a MISO ARIMAX model, of which the orders were analysed through statistic hypothesis test and model fits test, and the parameters were identified by Recursive Extended Least Squares method, using the real measured data. The simulation was carded out.