节点文献
变风量空调系统解耦控制研究
The Study of Decoupling Control in Variable-Air-Volume Conditioning System
【作者】 郭方敏；
【导师】 任庆昌；
【作者基本信息】 西安建筑科技大学 ， 控制理论与控制工程， 2010， 硕士
【摘要】 变风量空调系统(Variable Air Volume Air Conditioning System)是根据末端负荷的变化随时调整送风机的转速,以此减少风机的损耗,达到节能目的的。目前变风量空调系统以其巨大的节能潜力越来越受关注,也被越来越多的应用于各种大型智能建筑中,但是,变风量系统又具有多变量、非线性、强耦合等特点,因此它的控制系统的设计与运行不易实现；另一方面,它的节能效果也需要长期运行才能显现出来,这在一定程度上也影响了变风量空调系统的发展和应用。本论文主要研究变风量空调系统多个控制回路之间的解耦控制,对耦合对象进行分析研究,提出解耦控制方案,并通过仿真和实验验证方案的可行性。本论文选择两个末端温度和送风CO2浓度三个控制回路作为研究对象。首先,对耦合对象进行分析研究,设计了基于前馈补偿方法的解耦控制方案；其次设计实验,采集数据,建立耦合对象的数学模型,设计单神经元PID自适应控制器,并且通过MATLAB仿真研究,验证所设计的解耦控制方案和控制器的有效性；最后,以西安建筑科技大学智能建筑研究所变风量空调系统为实验平台,应用LabVIEW编写实验程序,验证了文中提出的解耦控制方案的可行性和有效性。仿真和实验结果基本满意,为实际工程中变风量空调系统的解耦控制应用提供了参考。
【Abstract】 Variable Air Volume System (Variable Air Volume Air Conditioning System) achieves energy saving purposes, by adjusting blower speed based on changes of terminal load and reducing the loss of fans. In currently, because of its huge potential on energy saving, VAV system is increasingly popular in applications of intelligent building. But also, VAV system has some characteristics such as multivariable, nonlinear and strong coupling. So the design and operation of the system is hard to achieve. On the other hand, only after a long run, the advantages of VAV system can be shown, which also affect the development and application of VAV system.In this paper, Attention is concentrated on studying the decoupling control of VAV system. Based on analyzing the coupled objects, a decoupling control network be designed, and its feasibility is verified by simulation and experiment. Two temperature control loops of terminals and an air concentration of carbon dioxide control loop are research objects of this paper. At first, a decoupling system, based on feed-forward compensation, has been designed. Secondly, based on experimental data, the mathematics model of coupling plants is built, the adaptive PID controller based on a Neural network is designed, and the feasibility of the decoupling control is verified by simulation. Lastly, based on VAV conditioning laboratory in Xi’an University of Architecture and Technology, design experimental program to verify the effectively and feasibility of the decoupling control system. The results of simulation and experiment are not only satisfying but also provide a reference for practical engineering application.