空调系统的切换最优控制器设计

发布时间：2018-02-26 07:28

本文关键词： 空调系统建模切换控制最优控制　出处：《沈阳工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文以暖通空调系统为研究对象,深入地研究了空调系统的建模及控制器设计。在空调系统中,对蒸发温度和过热度的控制是其控制的重要环节,实现对蒸发温度和过热度的快速及稳定控制也是实现空调系统高效节能运行的关键。首先,本论文详细地分析了空调系统的基本工作原理,建立了空调制冷系统的5阶非线性动态集中参数模型。并对所建立的空调制冷系统非线性模型在选定的工作点处进行了线性化。为避免单一工作点处线性化产生的建模误差而造成控制效果差的问题,本课题采用了切换控制的基本思想,对建立的空调制冷系统的非线性模型选择在多个工作点处进行线性化处理,从而得到了一组空调控制系统的线性状态空间模型。然后,分别对描述空调切换系统的每个线性子模型设计了状态调节的线性二次型最优控制器,并根据实际系统的运行情况,设计了空调系统切换控制的切换规则。为保证控制系统在任意切换下能够稳定运行,本文利用共同李雅普诺夫方法验证了系统在任意切换下的稳定性,从而完成了空调系统切换最优控制器的设计。最后,为了验证对建立的空调系统2输入(膨胀阀开度和压缩机转速)2输出(蒸发温度和过热度)模型所设计的控制器的控制效果,本文基于MATLAB仿真软件,对空调控制系统在多种工况下进行了仿真分析。仿真结果表明,控制系统实现了在多个控制器切换运行下的调节控制,取得了良好的控制效果,证实了切换控制器的有效性。
[Abstract]:Taking HVAC system as the research object, the modeling and controller design of HVAC system are deeply studied in this paper. In the air conditioning system, the control of evaporation temperature and superheat is an important part of the control. To realize the fast and stable control of evaporation temperature and superheat is also the key to realize the high efficiency and energy saving operation of the air conditioning system. Firstly, the basic working principle of the air conditioning system is analyzed in detail in this paper. The fifth order nonlinear dynamic centralized parameter model of air-conditioning refrigeration system is established, and the nonlinear model of air-conditioning refrigeration system is linearized at the selected working point to avoid the linearization of the single working point. The problem of poor control effect caused by the modeling error of. In this paper, the basic idea of switching control is adopted. The nonlinear model of air-conditioning refrigeration system is linearized at multiple working points, and a group of linear state space models of air conditioning control system are obtained. A linear quadratic optimal controller is designed for each linear submodel describing the air conditioning switching system, and according to the actual operation of the system, a linear quadratic optimal controller is designed. In order to ensure the stable operation of the control system under arbitrary switching, the common Lyapunov method is used to verify the stability of the system under arbitrary switching. In order to complete the design of the optimal controller for air conditioning system switching. Finally, In order to verify the control effect of the controller designed for the established model of the air conditioning system 2 input (expansion valve opening and compressor speed output) (evaporation temperature and superheat), this paper is based on MATLAB simulation software. The simulation analysis of air conditioning control system under various operating conditions shows that the control system realizes the adjustment control under the switching operation of multiple controllers and achieves good control effect. The effectiveness of the switching controller is verified.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP273;TB657.2

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