Compensation method for unknown network delay of network cascade control system

A technology of cascade control and compensation method, applied in the direction of transmission system, comprehensive factory control, digital transmission system, etc., can solve the problems of system failure, system instability, system performance degradation, etc., to achieve compensation, eliminate influence, improve The effect of controlling the quality of performance

Inactive Publication Date: 2011-04-06
HAINAN UNIVERSITY
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Problems solved by technology

[0008] (2) The network delay that occurs in the process of transmitting network data from the previous node to the next node, no matter what prediction or estimation method is used in the previous node, it is impossible to know in advance the subsequent network delay Accurate value. Time delay leads to system performance degradation and even system instability, and also brings difficulties to

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  • Compensation method for unknown network delay of network cascade control system
  • Compensation method for unknown network delay of network cascade control system
  • Compensation method for unknown network delay of network cascade control system

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Embodiment Construction

[0104] The following will refer to the attached image 3 Exemplary embodiments of the present invention are described in detail to make the above and other features and advantages of the present invention more apparent to those skilled in the art.

[0105] The specific implementation steps are as follows:

[0106] The first step: the main transmitter node working in the time-driven mode to the main controlled object G 1 (s) output signal Y 1 (s) Periodic sampling (the sampling period is h 1 );

[0107] Step 2: The main transmitter node will Y 1 (s) transmitted to the main controller node through the outer loop feedback network path;

[0108] Step 3: The main controller node working in the event-driven mode is signaled by Y 1 (s) triggered; the system given signal R (s) and Y 1 (s) add and subtract to get the error signal e 1 (s); and e 1 (s) transmit to the secondary controller node through the outer loop forward network path;

[0109] Step 4: The sub-transmitter nod...

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Abstract

The invention provides a compensation method for unknown network delay of a network cascade control system, belonging to the technical field of network control systems. The method adopts a network data transmission process among all forward and feedback network path nodes of the actual network cascade control system to replace a network delay compensation model thereof, avoids measurement, observation, estimate or identification for unknown delay of network data transmission among the nodes, and also avoids the synchronization requirement on node clock signals. The method can reduce the influence of unknown network delay on stability of the system and improve the control performance quality of the system. The method is suitable for dynamically compensating and controlling unknown network delay in all forward and feedback network paths of network simultaneously existing in the network cascade control system, when mathematical models of main auxiliary controlled objects are known or unknown, the system has unknown interference, and the network exists a certain amount of data packet losses.

Description

technical field [0001] The invention relates to a compensation method for unknown network delay in a network cascade control system, belonging to the technical field of network control systems. Background technique [0002] With the widespread use of computer networks and the continuous development of network technology, the structure of the control system is changing, and networked control systems (NCS) have emerged as the times require. "Networked control systems" refer to the field sensors, control It is a collection of devices, actuators and communication networks to provide data transmission between devices, so that users in different locations in the area can share resources and coordinate operations. It is a fully distributed system that integrates communication networks and control systems. , Networked real-time feedback control system. This networked control mode has the advantages of sharing information resources, reducing the number of connection lines, easy expan...

Claims

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Application Information

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IPC IPC(8): G05B19/418H04L7/00
CPCY02P90/02
Inventor 杜锋杜文才
Owner HAINAN UNIVERSITY
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