Unknown network delay IMC method of two-input and two-output networked decoupling control systems

Abstract

The invention provides an unknown network delay IMC method of two-input and two-output networked decoupling control systems, and belongs to the technical field of bandwidth resource limited MIMO-NDCS. Aiming at the problems of loss of stability of TITO-NDCS and influencing the stability of respective closed control loops and influencing the stability of the whole system due to network delay generated by transmission of network data between nodes in the TITO-NDCS in which two-input and two-output signals are mutually influenced and coupled and require decoupling, the method that the network data transmission process between all the real nodes in the TITO-NDCS replaces a network delay compensation model is put forward, and IMC is performed on the two loops so that measurement, estimation or identification of the network delay between the nodes can be omitted, the synchronization requirement of clock signals can be reduced, the influence of the unknown network delay on the stability of the TITO-NDCS can be reduced and the system control quality can be improved.

Description

technical field [0001] The IMC (Internal Model Control, IMC) method of the unknown network delay of the two-input-output network decoupling control system involves the intersection of automatic control, network communication and computer technology, especially the decoupling control of multiple-input and multiple-output networks with limited bandwidth resources systems technology field. Background technique [0002] In a distributed control system, a closed-loop feedback control system composed of a real-time communication network between sensors and controllers, controllers and actuators is called Networked control systems (NCS). The typical structure of NCS is as follows: figure 1 shown. [0003] Compared with the traditional point-to-point structure control system, NCS has the advantages of low cost, easy information sharing, easy expansion and maintenance, and great flexibility. In recent years, it has been widely used in process automation, manufacturing automation, ae...

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Problems solved by technology

[0010] (2) The internal structure is much more complex than SISO-NCS

[0011] (3) There may be uncertain factors in the accused

[0012] 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.

[0013] (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

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

[0020] (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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