Abstract
Following on from the previous chapter, Chap. 7 describes how to deal with Internet transmission delay and data loss from the viewpoint of both the control system structure and compensation algorithms. Five control system structures are presented here: virtual supervision parameter control, model-based predictive display tele-operation, intelligent autonomy control, control system with a variable sampling time, and multi-rate control. Feedback and feed-forward time delay compensator design is also described in detail. A compensator located at the feedback channel is designed to overcome the time delay that occurs during the transmission from the local site to a remote site. Another compensator, in the feed-forward channel, is designed to compensate for the time delay occurring in the control action transmission. Simulations and experimental studies that focus on the virtual supervision parameter control, control with a variable sampling time, and multi-rate control with time delay compensation structures are described. They are designed for various requirements. The multi-rate control scheme presented with the time delay compensators offers a promising way to efficiently reduce the effect of Internet time delay on control performance, in which a two-level hierarchy is used. At the lower level, a local controller is implemented to control the plant at a higher frequency. At the higher level, a remote controller is employed to remotely regulate the desirable setpoint at a lower frequency for the local controller.
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Yang, SH. (2011). Dealing with Internet Transmission Delay and Data Loss from the Control Perspective. In: Internet-based Control Systems. Advances in Industrial Control. Springer, London. https://doi.org/10.1007/978-1-84996-359-6_7
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DOI: https://doi.org/10.1007/978-1-84996-359-6_7
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