Uncertain time delay compensation method for two-input two-output network decoupling control system

Abstract

The invention discloses an uncertain time delay compensation method for a two-input two-output network decoupling control system (TITO-NDCS), and belongs to the technical field of MIMO-NDCSs (Multi Input Multi Output-Network Decoupling Control Systems) having limited bandwidth resources. For the TITO-NDCS of which two-input two-output signals affect each other, are coupled and need to be decoupled, the network delay produced by transmission of network data between nodes not only affects the stability of respective closed-loop control circuits, but also will affect the stability of the whole system, and even results in the problem of instability of the TITO-NDCS, a real network data transmission process among all nodes in the TITO-NDCS is proposed to substitute a method of a network delay compensation model therebetween, and IMC (Integrated Marketing Communication) and SPC (Statistical Process Control) are respectively implemented on the two circuits, so that measurement, estimation or identification on network delay among nodes can be removed, the clock signal synchronization requirement is reduced, the influence of uncertain time delay on the stability of the TITO-NDCS is reduced, and the control 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 multiple-input multiple-output network decoupling control system with limited bandwidth resources. Background technique [0002] A closed-loop feedback control system composed of a real-time communication network is called a networked control system (Networked control systems, NCS). NCS is a distributed control system integrating communication network and control system. It also has the functions of signal processing, optimal decision-making and control operation. The typical structure of NCS is as follows: figure 1 shown. [0003] Compared with the traditional point-to-point direct control system, the biggest feature of NCS is that the sensors, controllers and actuators in the system are not directly connected point-to-point, but exchange data and control inform...

AI Technical Summary

Problems solved by technology

[0011] (2) The internal structure is much more complex than SISO-NCS

[0012] (3) There may be uncertain factors in the accused

[0013] 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.

[0014] (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

[0020] (3) It is unrealistic to fully synchronize the clock signals of all nodes in different distribution locations in MIMO-NDCS

[0021] (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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