Two-input and two-output networked control system unknown time delay IMC method

Abstract

The invention provides a two-input and two-output networked control system unknown time delay IMC method, belongs to the technical field of a bandwidth resource limited multiple-input and multiple-output networked control system, and aims at the mutual influence between two-input and two-output signals in the TITO-NCS. The network time delay generated by transmission of network data between nodes influences the stability of its own closed-loop control loop and also influences the stability of another closed-loop control loop and even causes loss of the stability of the TITO-NCS, and thus a compensation model of replacing the uncertain network time delay by the network data transmission process between all the real nodes in the TITO-NCS is put forward, and IMC is performed on the two loops. With application of the method, measurement, estimation or identification of the network time delay between the nodes can be eliminated, the requirement for node clock signal synchronization can be eliminated, the influence of the unknown network time delay on the stability of the TITO-NCS can be reduced and the control performance quality of the system can be improved.

Description

technical field [0001] A two-input and two-output (Two-input and two-output, TITO) network control system unknown delay IMC (Internal Model Control, IMC) method, related to automatic control technology, network communication technology and computer technology, especially related to bandwidth The technical field of resource-limited multiple-input and multiple-output (Multiple-input and multiple-output, MIMO) network control systems. Background technique [0002] With the development of network communication, computer and control technology, and the increasingly large-scale, wide-area, complex and networked development of production process control, more and more network technologies are applied to control systems. Networked control systems (NCS) refer to network-based real-time closed-loop feedback control systems. The typical structure of NCS is as follows: figure 1 shown. [0003] NCS can realize complex large systems and remote control, node resource sharing, and increas...

AI Technical Summary

Problems solved by technology

[0011] (3) There are many unknown factors in the accused

[0012] In MIMO-NCS, there are many parameters involved, and there are many connections between the control loops, and the influence of the parameter change of the controlled object on the overall control performance will become more complicated.

[0013] (4) The control components are more likely to fail

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

[0019] (3) It is unrealistic to fully synchronize the clock signals of all nodes in different distribution locations in MIMO-NCS

[0020] (4) In MIMO-NCS, the input and output signals affect each other and may produce coupling effects. The internal structure of the system is more complex than that of SISO-NCS, and there are many uncertain factors. The control performance and quality of each control loop are excellent. Inferiority and stability issues will affect and restrict the performance quality and stability of the entire system, and its implementation of delay compensation and control is much more difficult than SISO-NCS

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