摘要
针对受到干扰影响的制冷系统,提出了一种基于干扰观测器的控制方法。首先,利用改进的Smith预估补偿技术处理纯滞后环节的影响,并采用解耦技术将制冷系统简化成两个独立的单输入单输出子系统。然后,设计干扰观测器估计系统的不确定性和外界干扰,并结合前馈控制技术进行补偿。其次,采用PI控制方法设计反馈控制器,以保证闭环控制系统的稳定性,并使制冷系统的过热度和蒸发温度准确跟踪给定值。最后,仿真结果表明,该方法能够增强系统的抗干扰能力,提升系统的控制性能。
A new disturbance observer based control(DOBC)method is proposed for the refrigeration system in the presence of disturbances.Firstly,an improved Smith predictor is developed to deal with the time delay of the refrigeration system,and the decoupling algorithm is employed to separate the system into two single-input single-output(SISO)subsystems.Secondly,with the outputs of the disturbance observer,the lumped disturbances containing parameter uncertainties and external disturbance are compensated by feed-forward control technique.Then,a PI feedback controller is designed to ensure the stability of the closed-loop control system,and to drive the degree of superheat and evaporating temperature to the set-points accurately.Finally,the simulation results demonstrate that the proposed control method can improve the capability of disturbance suppression and control performance of the refrigeration system.
作者
张腾飞
方星
刘飞
李兆博
ZHANG Teng-fei;FANG Xing;LIU Fei;LI Zhao-bo(Key Laboratory of Advanced Process Control for Light Industry(Ministry of Education),School of IOT Engineering,Jiangnan University,Wuxi 214222,China;School of Electrical Engineering and Automation,Tianjin University,Tianjin 300072,China)
出处
《控制工程》
CSCD
北大核心
2020年第7期1204-1209,共6页
Control Engineering of China
基金
国家自然科学基金项目(61803182),(BK20180593),(61703118)。
关键词
制冷系统
SMITH预估器
干扰观测器
前馈补偿
抗干扰控制
Refrigeration system
Smith predictor
disturbance observer
feed-forward compensation
anti-disturbance control
