Control method of Smith prediction monitoring AGC system

Abstract

The invention relates to a control method of a hot-strip-rolling monitoring AGC system. A transfer function model of an HGC system is established according to a structure of an inner-loop system (HGCsystem) of the Smith prediction monitoring AGC control system; a frequency-domain system identification algorithm is employed for identifying model parameters of the transfer function model of the HGCsystem, and then a mathematical model of the Smith prediction monitoring AGC system is established, and is then discretized; and a sliding-mode variable-structure controller (SMC) of the hot-strip-rolling Smith prediction monitoring AGC system is designed on the basis thereof. Therefore, the problems that according to PID controllers in existing hot-strip-rolling Smith prediction monitoring AGC systems, control accuracy heavily depends on modeling accuracy of control objects, and adaption ability on time lagging, nonlinearity and time-varying of the control objects is poor are solved. Robustness of the hot-strip-rolling Smith prediction monitoring AGC system is improved, and thus control accuracy of hot-strip-rolling strip steel thickness is improved.

Description

technical field [0001] The invention relates to the technical field of automatic control of plate and strip rolling, in particular to the processing of the time lag problem in the monitoring AGC system of hot continuous rolling of plate and strip. Background technique [0002] The monitoring AGC is based on the closed-loop control of the thickness of the rack outlet by the thickness gauge on the outlet side of the rack, so the monitoring AGC ensures that the thickness of the finished product is consistent with the target thickness in terms of trend. Therefore, monitoring AGC is irreplaceable compared to other types of AGC. For hot continuous rolling, considering the limitations of the rolling mill structure, the convenience of maintenance of the thickness gauge, and the prevention of damage to the thickness gauge caused by broken strips, the installation position of the thickness gauge is generally at a certain distance from the finish rolling exit stand. Therefore, there i...

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of control method of Smith predictive monitoring AGC system, to solve existing Smith predictive monitoring AGC system, sensitive to system model parameter error, to the time lag, non-linearity and time-varying processing ability of control object bad question

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