基于模糊PID前馈控制的VRV空调控制方法研究  

A Study on Control Method of VRV Air ConditionerBased on Fuzzy PID Feedforward Control

作　　者：郭兆明 李树江[1] 张俊 Guo Zhaoming;Li Shujiang;Zhang Jun(School of Information Science and Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学信息科学与工程学院,辽宁沈阳110870

出　　处：《计算机测量与控制》2020年第12期65-69,共5页Computer Measurement &Control

基　　金：辽宁省教育厅青年科技人才“育苗”项目(LQGD20-19012)。

摘　　要：变制冷剂流量(VRV)空调系统由于其舒适性、环保性和节能性得到了广泛的应用,但其系统具有多变量、非线性、强耦合等特点;对于这个问题,在VRV空调系统房间模型基础上,应用仿真实验以及数学建模的方式建立蒸发器过热度、制冷剂质量流量以及电子膨胀阀的数学关系,设计了带有前馈补偿的模糊PID控制器,以过热度的偏差及其变化率作为输入,通过模糊推理在线整定的PID控制器参数,解决蒸发器过热度控制的不确定性、非线性和时变性问题,实现了对本房间过热度的精准控制;其次,针对不同房间负荷变化产生相互影响的耦合现象,将本房间以外的制冷剂总流量的变化及其变化率作为输入,设计了基于模糊控制的前馈补偿器,修正电子膨胀阀开度;然后,对所设计的控制方法进行仿真验证,模拟了多种VRV中央空调系统在不同房间的工况和负荷改变时的仿真实验,结果表明过热度控制方法可行、有效,可以针对存在耦合的房间进行精准的过热度调节。Variable refrigerant volume(VRV)air-conditioning system with its comfort environmental protection and energy saving characteristics have been a wider range of applications,but the system has features of multivariable,nonlinear and strong coupling.Based on the VRV room model,the mathematical relations of evaporator superheat refrigerant mass flow and electronic expansion valve are established by means of simulation experiment and mathematical modeling.Designing a fuzzy PID controller with feedforward compensation,considers the degree of superheat and its difference value as input,through fuzzy reasoning setting PID controller parameters online,solves the problems of evaporator superheat degree controlling uncertainty,nonlinear and time-varying,realizes controlling precision to the room;Secondly,the coupling phenomenon of mutual influence is produced according to the change of room load,considering the change of total refrigerant flow outside of this room and its rate of change rate as input,the feedforward compensator is designed based on fuzzy control,the electronic expansion valve opening is fixed.Then,the control method is verified by simulation,and the variation of operating condition and load in different rooms of VRV central air conditioning system are simulated.The results show that the degree of superheat control method is feasible and effective,and it can be used for adjusting the degree of superheat in coupling rooms accurately.

关 键 词：VRV空调 模糊PID 前馈补偿 过热度 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]