A method for revising performance limits of a network control system based on single-degree-of-freedom controllers

By building a single-degree-of-freedom controller network control system and using tools such as coprime decomposition and Youla parameterization, the system's corrected performance limit is calculated, the impact of data loss and delay in the network control system is resolved, the tracking performance of the multi-input and multi-output network control system is improved, and the infimum of the system performance is quantified.

CN118838180BActive Publication Date: 2025-10-17CHINA UNIV OF GEOSCIENCES (WUHAN)
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Patent Information

Application Number
CN202410970060.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-07-19
Publication Date
2025-10-17
Estimated Expiration
2044-07-19

AI Technical Summary

Technical Problem

When studying the tracking performance limits of networked control systems, existing technologies fail to effectively consider data packet loss, delay, and signal constraints. Especially when the resolution of the quantizer is high, it is impossible to conduct in-depth research on the corrected tracking performance limits of multi-input and multi-output networked control systems.

Method used

A network control system based on a single-degree-of-freedom controller is built. By using double coprime decomposition, double Bezout equations and Youla parameterization, combined with full-pass decomposition, H2 space decomposition and partial fraction decomposition techniques, the second optimal tracking performance expression of the system is calculated, and an explicit expression of the system's corrected performance limit is obtained.

Benefits of technology

On the premise of ensuring system stability, the tracking performance of the multi-input multi-output discrete network control system is improved, the impact of the essential characteristics of the controlled object and communication constraints on the system performance is quantified, and the infimum of the system is provided.

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Abstract

The application provides a method for modifying performance limit of a single-degree-of-freedom controller network control system, and relates to the field of network system control, which comprises the following steps: building a single-degree-of-freedom controller network control system under the influence of quantization, obtaining an optimal performance expression of the system, according to the double-coprime decomposition of the system, combining the double-Bezout equation and the Youla parameterized form of the single-degree-of-freedom controller to solve a second expression form of the transfer function of the system, and then obtaining a second optimal tracking performance expression of the system, and based on the all-pass decomposition, H2 space decomposition and internal-external decomposition technology, an explicit expression of the modified performance limit of the system is obtained. The application has the beneficial effects that the problems of the modified tracking performance limit and the modified trade-off performance limit of the system are studied, the tracking performance of the multi-input multi-output discrete network control system is greatly improved, and the influence of the essential characteristics of the controlled object and the communication constraint on the system performance is quantified.
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