SPC and two freedom degree IMC method for dual-input dual-output NDCS network delay

Abstract

The invention provides an SPC and two freedom degree IMC method for dual-input dual-output NDCS network delay, which belongs to the technical field of MIMO-NDCS with limited bandwidth resources. For TITO-NDCS, dual-input dual-output signals affect each other and are coupled, and decoupling is needed. Due to network delay generated by the transmission of network data between nodes, the stability of the respective closed-loop control loop is affected, and the stability of the whole system is affected. TITO-NDCS is not stable. According to the method, the network data transmission process of all real nodes in TITO-NDCS replaces the network delay compensation model; SPC and two-freedom-degree IMC are carried out on two loops respectively; measurement, estimation or identification of network delay between nodes can be eliminated; the clock signal synchronization requirement is reduced; the impact of network delay on the TITO-NDCS stability is reduced; and the system control quality is improved.

Description

technical field [0001] A dual-input-output NDCS (Networked decoupling control systems, NDCS) network delay SPC (Smith Predictor Control, SPC) and two degrees of freedom IMC (Internal Model Control, IMC) method, involving automatic control technology, network communication technology and computer It is an intersecting field of technology, especially related to the technical field of decoupling control system of multiple-input multiple-output network with limited bandwidth resources. 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] In NCS, due to the introduction of the network, the complexity and cost of the control system are reduced, and many remote nodes (or devices) are organically combined through the network to cooperate to complete the work that a single node (or devic...

AI Technical Summary

Problems solved by technology

[0009] (2) The internal structure is much more complex than SISO-NCS

[0010] (3) There may be uncertain factors in the accused

[0011] 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.

[0012] (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

[0018] (3) It is unrealistic to fully synchronize the clock signals of all nodes in different distribution locations in MIMO-NDCS

[0019] (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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