IMC method of time-varying network time delay of two-input two-output networked decoupling control system

Abstract

The invention discloses an IMC method of time-varying network time delay of a two-input two-output networked decoupling control system, and belongs to the technical field of MIMO-NDCS with limited bandwidth resources. For a TITO-NDCS which has two-input and two-output signals which impact one another and are coupled, and often requires decoupling if the two-input and two-output signals are coupled, since network time delay which occurs in the transmission of network data among nodes not only impacts the stability of respective closed-loop control circuit and also impacts the stability of the entire system and even causes instability of the TITO-NDCS, the method herein proposes to replace an inter-network time delay compensating model with network data transmission among all real nodes in the TITO-NDCS and conduct IMC on two circuits. Therefore, the method can prevent measurement, estimation or discrimination of network time delay among the nodes, lowers the requirements for clock signal synchronization, reduces the impact on the stability of the TITO-NDCS by uncertain network time delay, and improves control properties and quality of the system.

Description

Technical field [0001] The IMC (Internal Model Control, IMC) method for the time-varying 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 of multiple-input and multiple-output networks with limited bandwidth resources Control system technology field. Background technique [0002] In a distributed control system, a closed-loop feedback control system formed by a real-time communication network between sensors and controllers, controllers and actuators is called Networked Control Systems (NCS). The typical structure of NCS is 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, aerospace, and wire...

AI Technical Summary

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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