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Time-varying network time delay compensation method for TITO-NDCS utilizing SPC and two-freedom IMC

A TITO-NDCS, time-varying network technology, applied in the field of multi-input multi-output network decoupling control systems, can solve the problems of many uncertain factors, complex influence, system performance degradation, etc., to improve the dynamic performance quality and reduce the impact. Effect

Inactive Publication Date: 2017-06-13
HAINAN UNIVERSITY
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Problems solved by technology

[0010] (2) The internal structure is much more complex than SISO-NCS and MIMO-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. Implementing delay compensation and control for MIMO-NDCS is much more difficult than MIMO-NCS and SISO-NCS

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  • Time-varying network time delay compensation method for TITO-NDCS utilizing SPC and two-freedom IMC
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  • Time-varying network time delay compensation method for TITO-NDCS utilizing SPC and two-freedom IMC

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[0154] 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.

[0155] The specific implementation steps are as follows:

[0156] For closed loop control loop 1:

[0157] The first step: the sensor S1 node works in the time-driven mode, and the sampling period is h 1 triggered by the signal; when the sensor S1 node is triggered, 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 decoupled actuator DA1 node 11mb (s) and y 12mb (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)-y 12mb (s);

[0158] Step 2: The sensor S1...

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Abstract

A time-varying network time delay compensation method for a TITO-NDCS utilizing SPC and two-freedom IMC belongs to the technical field of an MIMO-NDCS with limited bandwidth resource. In the TITO-NDCS in which two input signals and two output signals affect one another and are coupled and decoupling processing is required, because of network delay generated in a network data transmission process between nodes, not only is stability of a respective closed control loop reduced, but also stability of the whole system is reduced, and even un-stability of the TITO-NDCS is caused. According to the method of the invention, a network data transmission process between all real nodes in the TITO-NDCS replaces a network time delay compensation model between the nodes, and furthermore SPC and two-freedom IMC are applied to two loops, thereby avoiding measurement, estimation or identification for network time delay between the nodes, reducing a clock signal synchronization requirement, reducing effect of the time-varying network time delay to stability of the TITO-NDCS, and improving system control quality.

Description

technical field [0001] A TITO (Two-input and two-output, TITO)-NDCS (Networked decoupling control systems, NDCS) time-varying network delay compensation method based on SPC (Smith predictor control, SPC) and two-degree-of-freedom IMC (Internal model control, IMC) , involving the interdisciplinary field of automatic control technology, network communication technology and computer technology, especially the technical field of multi-input multi-output network decoupling control system with limited bandwidth resources. Background technique [0002] In a distributed control system, a closed-loop feedback control system composed of a real-time communication network between sensors and controllers, controllers and actuators is called Networked control systems (NCS). The typical structure of NCS is as follows: figure 1 shown. [0003] Compared with the traditional point-to-point structure control system, NCS can realize resource sharing, remote operation and control, high diagnost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 杜锋
Owner HAINAN UNIVERSITY
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