基于Internet的网络化控制系统设计及控制研究

对于基于Internet的网络化控制系统,由于其网络延时具有随机、长时滞特性,使得控制系统稳定性和动态性能很差。本文基于离散的状态反馈网络化控制系统,提出了一种基于对象模型的多步预测补偿方法,通过在执行器端设置消息缓冲的办法实现时滞补偿的策略。基于Socket技术,应用LabWindows/CVI,采用以上时滞补偿方法设计了基于Internet的液位过程控制系统。实时跟踪控制实验和抗外部扰动实验结果结果表明,本文所提时滞补偿策略有效可行,能够很好地提高网络控制系统的动态性能。

Design and control of Internet-based process control system

The stochastic and long delays degrade the stability and dynamic performance of networked control system in Internet-based control system. A multiple-step prediction compensation method based on discrete state feedback networked controlled system model and the corresponding realizations of time-delay compensation by setting up buffers in the actuator are put forward in this paper. An lnternet-based level process control system was designed using above mentioned compensation method and based on Socket technology and LabWindows/CVI. The experiment results of Interact-based level process real time control and disturbance rejection show that the compensation method is effective and the dynamic performance of NCS is greatly improved by the compensation method presented in this paper.