基于互联网的过程控制系统的时延补偿  

Time-delay compensation for Internet-based process control systems

作　　者：李红艳[1] 

机构地区：[1]湖北经济学院计算机与电子科学系,湖北武汉430205

出　　处：《华中科技大学学报（自然科学版）》2005年第8期51-53,共3页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(60174043)

摘　　要：为了克服不确定性变化的时延影响,基于互联网的过程控制系统的动态性能,在传统的控制系统结构中设计了带时延预测器的网络时延补偿环节.该时延预测器采用AR模型对互联网的传输时延进行在线预测,仿真结果表明在时延变化不太剧烈、稳定性比较好的情况下,有85.3%的时延预测值预测误差在5%以内,利用AR模型取得了很好的预测效果.通过基于互联网的水箱控制系统实验表明:采用该网络时延补偿环节既能保证控制系统的稳定性,又能缩短控制系统稳定的调节时间和减少超调量,改善控制系统的动态性能.A time-delay compensator was designed based on traditional control system,architecture to overcome the uncertain transmission time-delay influencing the dynamic performance of Internet-based process control systems. The autoregressive （AR） model was adopted to implement the time-delay predictor, utilized to predict the dynamic Internet time-delay online. The simulation results showed that the proportion of time-delay prediction values, with prediction error of less 5 %, reached 85.3 % and the AR model can achieve ideal efficacy if time-delay has no variety abnormally. An Internet-based water tank control system was used to demonstrate the validity of the designed time-delay compensator. The experimental results illustrated that the time-delay compensator can maintain the stability of the process of the control system,shorten setting time, and decrease overshoot of the system, to improve dynamic performance of the system markedly.

关 键 词：互联网 过程控制系统 时延 补偿器 

分 类 号：TP273.5[自动化与计算机技术—检测技术与自动化装置]