Hybrid control method for uncertain time delay of two-input and two-output network control system

Abstract

The invention discloses a hybrid control method for an uncertain time delay of a two-input and two-output network control system (TITO-NCS), and belongs to the technical field of multi-input and multi-output network control systems with limited bandwidth resources. Aiming at the problems that the two input signals and two output signals of the TITO-NCS are mutually affected, the stability of one closed loop control circuit is affected and the stability of another closed loop control circuit is also affected due to a network time delay generated by transmission of network data among nodes, or even loss of the stability of the TITO-NCS is caused, a compensation model for replacing the uncertain time-delay with network data transmission process among all real nodes in the TITO-NCS is provided; and IMC and SPC hybrid control is carried out on two circuits separately, so that measurement, estimation or recognition of the network time delay among the nodes can be avoided, the requirements of clock signal synchronization of the nodes are avoided, the influence of the uncertain time delay on the stability of the TITO-NCS can be reduced and the control performance quality of the system is improved.

Description

technical field [0001] The present invention relates to automatic control technology, the intersection field of network communication technology and computer technology, especially relates to the technical field of multi-input multi-output network control system with limited bandwidth resources. 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 been widely used in complex industrial process control, power system, petroche...

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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