Inverse linear quadratic control method of hot continuous rolling thickness-loop synthetic system

Abstract

The invention relates to an inverse linear quadratic control method of a hot continuous rolling thickness-loop synthetic system. According to dynamic models of a loop control system and a automatic gauge control system, a continuous state space model of the hot continuous rolling thickness-loop synthetic system is established by using a state space analysis method; based on the established continuous state space model, proper sampling periods are selected, a zero-order holder method is adopted, the obtained continuous model is subjected to discretization, and a discrete state space model of the hot continuous rolling thickness-loop synthetic system is obtained; and on this basis, the inverse linear quadratic controller (ILQ) of the synthetic system is designed. According to the inverse linear quadratic control method of the hot continuous rolling thickness-loop synthetic system, in an existing hot continuous rolling control system, the automatic gauge control (AGC) system and the loopcontrol system are regarded as two independent control systems, and the problem of multivariable coupling between systems cannot be processed is solved; and according to the technical scheme providedby the embodiment of the inverse linear quadratic control method of the hot continuous rolling thickness-loop synthetic system, the coordinated optimization control of the thickness, tension and anglein the hot continuous rolling control system can be realized.

Description

technical field [0001] The invention relates to the technical field of strip hot rolling, in particular to the coordinated optimization control of a multivariable control system for strip hot rolling. Background technique [0002] The hot continuous rolling becomes a whole due to the connection of the strip steel, and there is mutual influence between the inside of the frame and between the frames due to the tension. When the system performance is not high, it can be roughly considered that the tension between the frames is small And constant. Therefore, the strip thickness controlled by the AGC system and the second flow and tension controlled by the looper, as well as the control between each frame can be approximately considered to be independent. However, the tension in the conventional hot rolling control cannot be kept constant, and the tension is an extremely active factor. The interaction between the AGC system and the looper system can no longer be ignored, and it ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of inverse linear quadratic control method of hot continuous rolling thickness-looper comprehensive system, to solve the problem that the thickness control system and the looper control system are used as two independent control methods in the existing strip hot rolling control The subsystem is processed, and the thickness, angle and tension cannot be coordinated and optimized

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