NPCCS uncertain network time delay compensation method based on SPC

A technology of network delay and compensation method, applied in the direction of instrument, adaptive control, control/regulation system, etc., can solve the problems of system performance degradation, difficulty, unrealistic clock signal synchronization, etc.

Inactive Publication Date: 2018-11-13
HAINAN UNIVERSITY
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Problems solved by technology

[0010] (1) Since network delay is related to factors such as network topology, communication protocol, network load, network bandwidth, and data packet size, for network delays greater than several or even dozens of sampling periods, it is necessary to establish each closed-loop control loop of NPCCS It is currently difficult to accurately predict, estimate or identify mathematical models of network delay in
[0011] (2) In NPCCS, the network delay in the process of transmitting network data from the previous network n

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  • NPCCS uncertain network time delay compensation method based on SPC
  • NPCCS uncertain network time delay compensation method based on SPC
  • NPCCS uncertain network time delay compensation method based on SPC

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[0119] The following will be attached by reference Picture 9 The exemplary embodiments of the present invention are described in detail to make the above-mentioned features and advantages of the present invention more clear to those skilled in the art.

[0120] The specific implementation steps are as follows:

[0121] Step 1: The main sensor S1 node works in time-driven mode, and its trigger signal is cycle h 1 Sample signal; when the main sensor S1 node is triggered, the main controlled object P 1 (s) output signal y 1 (s) Sampling, get feedback signal y 1 (s); the feedback signal y 1 (s), through the feedback network path of the main closed-loop control loop The unit transmits to the main controller C1 node, and the feedback signal y 1 (s) will experience network transmission delay τ 2 After that, it can reach the C1 node of the main controller;

[0122] Step 2: The C1 node of the main controller works in event-driven mode, and is fed back by the signal y 1 (s) After triggering, ...

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Abstract

An NPCCS uncertain network time delay compensation method based on SPC belongs to the single-input dual-output networked control system technology field with limited bandwidth resources. In the NPCCS,because of network time delay generated by network data when being transmitted among nodes, the control performance quality of the NPCCS is reduced and a system loses stability. Aiming at the above problems, all real network data transmission processes in the NPCCS are used to replace a network time delay compensation model. SPC based on a controlled object end and the SPC based on a controller end are implemented on primary and secondary closed-loop control loops. The measurement, estimation or identification of the network time delay among the nodes are avoided from a system structure, theinfluence of uncertain network time delay on NPCCS stability is reduced, the control performance quality of the system is improved, and the compensation and control of the uncertain network time delayare realized.

Description

Technical field [0001] A SPC (Smith predictor control, SPC)-based NPCCS (Networked parallelcascade control systems, NPCCS) uncertain network delay compensation method, involving the intersection of process control, network communication and computer control technologies, especially involving limited bandwidth resources Single-input dual-output networked control system technology field. Background technique [0002] Cascade control systems (CCS) is an advanced control system that is widely used in process control engineering. CCS can quickly suppress the disturbance that enters the secondary loop and improve the dynamic performance and anti-interference ability of the closed-loop control system. CCS usually includes two closed-loop control loops, namely a primary closed control loop (PCCL) and a secondary closed control loop (SCCL). [0003] CCS has two types of control system structures: one is the series cascade control system (SCCS) structure; the other is the parallel cascade ...

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Application Information

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