Two-input two-output network decoupling control system unknown time-delay two-degree-of-freedom IMC method

Abstract

The invention proposes a two-input two-output network decoupling control system (TITO-NDCS) unknown time-delay two-degree-of-freedom IMC method, which belongs to the technical field of a TITO-NDCS with limited bandwidth resources. In the face of the mutual influencing and coupling of two-input two-output signals, a decoupled TITO-NDCS shall be put in place, and since when the network data are transmitted among the nodes, network time delay occurs. This not only influences the stability of the closed-loop control circuits, but also impacts the stability of an entire system, and can even lead to the instability of the TITO-NDCS. Considering this, the network data transmission process among all real nodes in the TITO-NDCS is proposed to replace the network time delay compensation models among them, and at the same time, through the two-degree-of-freedom IMC to two loop circuits, it is possible to eliminate the measurement, estimation and identification of the network time delay among the nodes, to reduce the requirement for clock signal synchronization, to reduce the influence of the unknown network time delay on the stability of the TITO-NDCS, and to improve the system control quality.

Description

technical field [0001] The two-degree-of-freedom IMC (Internal Model Control, IMC) method for double-input and double-output network decoupling control systems with unknown delays involves the intersection of automatic control, network communication and computers, especially involving multiple-input and multiple-output network decoupling control with limited bandwidth resources systems technology field. Background technique [0002] The closed-loop feedback control system composed of real-time communication network is called networked control system (Networked control systems, NCS). The typical structure of NCS is as follows: figure 1 shown. [0003] NCS breaks through the limitations of the traditional control system in terms of physical location in space, and uses network connections for system units to integrate intelligent field devices and network business management, and realize network structure, intelligent nodes, on-site control, and decentralized functions. , Sys...

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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