Fault-tolerant anti-interference control method for vertical reduction system of rolling mill under typical working condition

Abstract

The invention discloses a fault-tolerant anti-interference control method for a vertical reduction system of a rolling mill under typical working conditions, and belongs to the technical field of rolling mill control. The control method comprises the following steps: step 1, establishing a two-degree-of-freedom nonlinear vertical reduction system model; 2, designing a self-adaptive controller by considering unknown system model parameters and servo valve execution direction fault characteristics, estimating unknown parameter perturbation and external disturbance by using a self-adaptive method, and adding a Nussbaum function into the controller to counteract the influence of controller faults so as to obtain a control scheme of the self-adaptive anti-disturbance fault-tolerant controller; and 3, verifying the effectiveness of the control scheme through computer simulation. According to the method, the closed-loop stability of the system can be guaranteed, meanwhile, disturbance caused by sudden load change to a rolling mill screw-down system in the rolling process can be effectively restrained, and the method has important significance on high-precision rolling of plates and strips.

Description

technical field [0001] The invention relates to the technical field of rolling mill control, in particular to a fault-tolerant and anti-disturbance control method for a vertical pressing system of a rolling mill under typical working conditions. Background technique [0002] The research of the patent of the present invention is aimed at the cold-rolled strip mill system. Since the load disturbance may fluctuate violently during the rolling process, the feedback control cannot quickly follow and resist the disturbance, and the input direction of the controller is opposite to the original input direction. This kind of problem can be regarded as a fault with unknown direction of the controller. If it cannot be avoided reasonably, the roll will fluctuate and oscillate when there is a problem in production, which will not only seriously affect the quality of exported steel products, but may even damage the structure of the continuous rolling unit and cause a safety accident. Usu...

AI Technical Summary

Problems solved by technology

[0002] The patent of the present invention is aimed at the cold-rolled strip mill system. Since the load disturbance may fluctuate violently during the rolling process, the feedback control cannot quickly follow and resist the disturbance. The problem that the input direction of the controller is opposite to the original input direction

This kind of problem can be regarded as a fault with unknown direction of the controller. If it cannot be avoided reasonably, the roll will fluctuate and oscillate when there is a problem in production, which will not only seriously affect the quality of exported steel products, but may even damage the structure of the continuous rolling unit and cause a safety accident.

Usually when such problems occur, the production line of the steel mill will stop immediately, and the shutdown maintenance will inevitably cause startup loss. In order to solve this problem, it is necessary to design an anti-disturbance controller that can resist the failure of unknown controller direction

Images