Two-degrees-of-freedom IMC method for two-input and two-output NDCS network delay

A technology of network delay and TITO-NDCS, applied in the field of multi-input multi-output network decoupling control system, can solve the problems of complex influence, many uncertain factors, complex internal structure, etc., so as to reduce the influence and improve the quality of dynamic performance Effect

Inactive Publication Date: 2017-09-12
HAINAN UNIVERSITY
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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 analysi

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  • Two-degrees-of-freedom IMC method for two-input and two-output NDCS network delay
  • Two-degrees-of-freedom IMC method for two-input and two-output NDCS network delay
  • Two-degrees-of-freedom IMC method for two-input and two-output NDCS network delay

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[0147] The following will refer to the attached Figure 5 Exemplary embodiments of the present invention will be described in detail to make the above-mentioned features and advantages of the present invention clearer to those skilled in the art.

[0148] The specific implementation steps are as follows:

[0149] For closed loop control loop 1:

[0150] Step 1: The sensor S1 node works in the time-driven mode, and the triggered signal is period h 1 After the sampling signal of the controlled object G 11 (s) output signal y 11 (s) and the controlled object cross-channel transfer function G 12 (s) output signal y 12 (s), and the output signal y of the A1 node of the actuator 11mb (s) Sampling and calculating the system output signal y of the closed-loop control loop 1 1 (s) and the feedback signal y 1b (s), and y 1 (s)=y 11 (s)+y 12 (s) and y 1b (s)=y 1 (s)-y 11mb (s);

[0151] Step 2: The sensor S1 node will feed back the signal y 1b (s), through the feedback ne...

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Abstract

The two-degree-of-freedom IMC method of two-input and two-output NDCS network delay belongs to the technical field of MIMO‑NDCS with limited bandwidth resources. For a kind of TITO-NDCS where two input and two output signals are influenced and coupled with each other, decoupling processing is required. The network delay caused by the transmission of network data between nodes not only affects the stability of the respective closed-loop control loops, but also Moreover, it will also affect the stability of the entire system, and even lead to the loss of stability of TITO-NDCS. It is proposed to replace the network delay compensation model with the network data transmission process between all real nodes in TITO-NDCS. The implementation of two-degree-of-freedom IMC can eliminate the need to measure, estimate or identify the network delay between nodes, reduce clock signal synchronization requirements, reduce the impact of network delay on the stability of TITO-NDCS, and improve the quality of system control.

Description

technical field [0001] A two-input and two-output NDCS (Networked decoupling control systems, NDCS) two-degree-of-freedom IMC (Internal Model Control, IMC) method for network delay, involving the intersection of automatic control technology, network communication technology and computer technology, especially involving bandwidth The technical field of resource-limited multiple-input multiple-output network decoupling control systems. 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 device) cannot complete. In addition, the information...

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Application Information

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IPC IPC(8): G05B13/04H04B7/0413
CPCG05B13/042H04B7/0413
Inventor 杜锋
Owner HAINAN UNIVERSITY
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