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

Abstract

The invention proposes a two-input two-output network decoupling control system (TITO-NDCS) large 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 implementation of 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 large network time delay on the stability of the TITO-NDCS, and to improve the system control quality.

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...

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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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