Two-input two-output network control system (TITO-NCS) variable delay hybrid method
A control system and output network technology, applied in general control systems, control/regulation systems, adaptive control, etc., can solve the difficulties of implementing delay compensation and control, control system analysis and design difficulties, and many uncertain factors, etc. question
Inactive Publication Date: 2017-08-18
HAINAN UNIVERSITY
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[0011] (3) There are many uncertain factors in the accused
[0012] In MIMO-NCS, there are many parameters involved, and there are many connections between the control loops, and the influence of the parameter change of the controlled object on the overall control performance will become more complicated.
[0013] (4) The control components are more likely to fail
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-NCS
[0020] (4) Since in MIMO-NCS, the input and output signals influence each other and may produce coupling effects, the internal structure of the system is more complex than that of SISO-NCS, and there are many uncertain factors. The control performance quality of each control loop Pros and cons and stability issues will have an impact and restriction on the performance quality and stability of the entire system, and its implementation of delay compensation and control is much more difficult than SISO-NCS
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[0141] The following will refer to the attached Image 6 Exemplary embodiments of the present invention are described in detail to make the above-mentioned features and advantages of the present invention more apparent to those skilled in the art.
[0142] The specific implementation steps are as follows:
[0143] For closed loop control loop 1:
[0144] Step 1: The sensor S1 node works in the time-driven mode, when the sensor S1 node is cycled for h 1 After the sampling signal of 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 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);
[0145] Step 2: The sensor S1 node will feed back the signal y 1b (s), trans...
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The invention proposes a two-input two-output network control system (TITO-NCS) variable delay hybrid method, which belongs to the technical field of a TITO-NCS with limited bandwidth resources. The two-input two-output signals influence each other; 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-NCS. Considering this, the network data transmission process among all real nodes in the TITO-NCS is proposed to replace the network time delay compensation models among them, and at the same time, dynamic feedforward IMC and SPC are implemented respectively to the two loop circuits. Therefore, 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 time-varying delay network time delay on the stability of the TITO-NCS, 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 multi-input multi-output network control system with limited bandwidth resources. Background technique [0002] With the development of network communication, computer and control technology, and the increasingly large-scale, wide-area, complex and networked development of production process control, more and more network technologies are applied to control systems. Networked control systems (NCS) refer to network-based real-time closed-loop feedback control systems. The typical structure of NCS is as follows: figure 1 shown. [0003] NCS can realize complex large systems and remote control, node resource sharing, and increase system flexibility and reliability. In recent years, it has been widely used in complex industrial process control, power system, petroche...
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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 杜锋
Owner HAINAN UNIVERSITY