Network delay two-degree-of-freedom IMC method of two-input and two-output networked control systems

Abstract

The invention provides a network delay two-degree-of-freedom IMC method of two-input and two-output networked control systems, and belongs to the technical field of bandwidth resource limited MIMO-NCS. Aiming at the problems of loss of stability of TITO-NCS and influencing the stability of its own closed control loop and influencing the stability of another closed control loop due to network delay generated by transmission of network data between nodes in the TITO-NCS in which two-input and two-output signals are mutually influenced, the method that the network data transmission process between all the real nodes in the TITO-NCS replaces a network delay compensation model is put forward, and two-degree-of-freedom IMC is performed on the two loops. With application of the method, measurement, estimation or identification of the network delay between the nodes can be omitted, the synchronization requirement of node clock signals can be omitted, the influence of the network 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 network control system network delay two degrees of freedom IMC (Internal Model Control, IMC) method, related to the intersection of automatic control, network communication and computer technology, especially related to the multi-input multi-output network control system with limited bandwidth resources technology field. 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 increase system flexibility and reliability. In recent years, it has ...

AI Technical Summary

Problems solved by technology

[0011] (3) There are many uncertain 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) Since in MIMO-NCS, the input and output signals influence 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 quality of each control loop Pros and cons and stability issues will have an impact and restriction on 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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