Long time delay compensating method for two-input two-output network decoupling control system

Abstract

A long time delay compensating method for two-input two-output network decoupling control system (TITO-NDCS) belongs to the technical field of a multi-input multi-output network decoupling control system with limited bandwidth resource. In the TITO-NDCS in which two input signals and two output signals affect one another and are coupled and decoupling processing is required, because of network delay generated in a network data transmission process between nodes, not only is stability of a respective closed control loop reduced, but also stability of the whole system is reduced, and further un-stability of the TITO-NDCS is caused. According to the method of the invention, a network data transmission process between all real nodes in the TITO-NDCS replaces a network time delay compensation model between the nodes, and furthermore SPC is applied to two loops, thereby avoiding measurement, estimation or identification for network time delay between the nodes, avoiding a clock signal synchronization requirement, reducing effect of the long network time delay to stability of the TITO-NDCS, and improving system control quality.

Description

Technical field [0001] The invention relates to the cross-field of automatic control technology, network communication technology and computer technology, and particularly relates to the technical field of multiple input multiple output network decoupling control systems with limited bandwidth resources. Background technique [0002] In a network environment, sensors, controllers and actuators form a closed loop through the network media to form a networked control system (NCS). The typical structure of NCS is figure 1 Shown. [0003] NCS has injected new vitality into classic and modern control theory, and at the same time, it also poses new challenges to the design of its system: on the one hand, the introduction of the network will bring advantages such as investment saving and easy maintenance; on the other hand, it will also bring Incoming delay, data packet loss, and other complex phenomena, especially the existence of variable network delay, can reduce the quality of NCS con...

AI Technical Summary

Problems solved by technology

[0009] (2) The internal structure is much more complex than SISO-NCS

[0010] (3) There may be uncertain factors in the accused

[0011] In MIMO-NDCS, there are many parameters involved, and there are many connections between control loops, and the influence of parameter changes on the overall control effect will become very complicated.

[0012] (4) Failure of control components

Time delay leads to system performance degradation and even system instability, and also brings difficulties to the analysis and design of the control system

[0018] (3) It is unrealistic to fully synchronize the clock signals of all nodes in different distribution locations in MIMO-NDCS

[0019] (4) Since in MIMO-NCS, the input and output influence each other and there is a coupling effect, the internal structure of MIMO-NDCS is more complicated than that of MIMO-NCS and SISO-NCS, and there may be more uncertain factors. It is much more difficult to implement delay compensation and control than MIMO-NCS and SISO-NCS

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