Optimal Control Method of Sampling Period in Networked Control System
A technology of networked control and sampling period, applied in general control systems, control/regulation systems, testing/monitoring control systems, etc., can solve problems such as the inability to guarantee the global optimal robustness of the system, external disturbances, etc.
Active Publication Date: 2019-04-09
HEFEI UNIV OF TECH
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Problems solved by technology
[0007] The technical problem to be solved by the present invention is to solve the problem that obtaining a robust controller with a fixed sampling period in the existing networked control technology cannot guarantee the global optimal robustness of the system, the problem of network delay, and the problem of external disturbance. A sampling period optimization control method for networked control system
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[0089] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only part of the embodiments of the present invention. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work all belong to the protection scope of this patent.
[0090] An embodiment of the present invention provides a sampling period optimization control method of a networked control system, which includes sampling the measured output variable and the regulated output variable of the controlled object.
[0091] according to figure 1 The flow chart of the control method shown, the steps of the embodiment of the present invention are as follows:
[0092] Step 1. Sampling the measured output variable and the adjusted output variable of the controlled object, and constructing a discrete system model;
[0093]
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The invention provides a networked control system sampling period optimization control method. The method comprises steps: a measurement output variable and a modulated output variable of a controlled object are sampled, and a discrete system model is built; the relationship between a sampling period Ts and network delay tau is built; a dynamic output feedback robust controller is designed, and a closed loop system model is built; whether the obtained closed loop system model meets a robust asymptotic stability requirement is detected; the relationship between the sampling period Ts and the optimal robust performance gamma is built; a sampling step length h is set, the next sampling period Ts'=Ts+h is set, the above process is repeated, sampling is stopped when the closed loop system loses robust asymptotic stability, the next sampling period Ts' corresponding to the minimum optimal robust performance gamma is defined as the optimal sampling period and is marked as Tgamma. The method of the invention mainly solves the sampling period optimization control problem, a dynamic output feedback robuts controller is designed, and in a condition of outside disturbance, good stability, dynamics and robustness of the system can still be ensured.
Description
technical field [0001] The invention relates to the technical field of automatic control of a networked control system, and relates to a sampling period optimization control method of a networked control system. Background technique [0002] With the increasing development and cross-penetration of automation control theory, computer technology and network communication technology, the structure of the control system is becoming more and more complex, and the space distribution is becoming wider and wider. The networked control system (Networked Control System, NCS) is a real-time A closed-loop feedback control system composed of a network. In a networked control system, the network is used as a transmission medium to realize data transmission between sensors, controllers, actuators and other network nodes, thereby realizing resource sharing, remote detection and control. With its low cost, flexible connection, easy installation and expansion, and easy maintenance, the netwo...
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Login to View More IPC IPC(8): G05B23/02
CPCG05B23/0213G05B2219/24065
Inventor 孙伟黄习习王建平李奇越穆道明徐晓冰
Owner HEFEI UNIV OF TECH