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.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
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)
关键词
互联网
过程控制系统
时延
补偿器
Internet
process control system
time delay
compensator
