Liquid level control method of continuous casting crystallizer based on Fuzzy-PID

Abstract

The invention relates to a liquid level control method of a continuous casting crystallizer based on Fuzzy-PID and belongs to the technical field of continuous casting production. The liquid level control method makes use of fuzzy control to carry out online correction of parameters in self-adjusting parameter PID control. Under the control of a computer and a PLC, the control method makes use of self-setting parameter PID control and fuzzy control to realize mixed control of the liquid level of the crystallizer, and also adopts a flow rate deviation compensating module, and the like. The control process of the control method comprises the following steps: setting an initial liquid level y0 and acquiring liquid levels y1 and y2 through a liquid level sensor and a liquid level measuring device; inputting the acquired data y1 and y2 in a PLC; adopting the self-setting parameter PID control and the fuzzy control to realize mixed control of a processing signal; and carrying out compensation through the compensating module; moreover, the output of the PLC, u(k) is equal to u1(k), and the PLC controls the position of a stopper through a stopper controller so as to control the liquid level of the crystallizer.

Description

Technical field: [0001] The invention belongs to the technical field of continuous casting production, in particular to a method for controlling the liquid level of a continuous casting crystallizer based on Fuzzy-PID. Background technique: [0002] With the advancement of technology in the steel industry, the market's requirements for the quality of steel products continue to increase. As an important link in the steel production process, continuous casting directly affects the quality of steel products. The change of the molten steel level in the continuous casting mold has an important impact on the quality of the slab, and stabilizing the molten steel level in the mold is of great significance for improving the quality of the slab and improving the casting effect. During the continuous casting process, the molten steel level in the mold should be kept within an appropriate range. If the molten steel level increases, it is equivalent to increasing the immersion depth of t...

AI Technical Summary

Problems solved by technology

In theory, the control method of switching between PID controller and fuzzy controller comprehensively utilizes the good steady-state performance of the PID controller and the good transient performance of the fuzzy controller, but in the actual production process, the uncertainty of the system makes the PID The controller is difficult to adapt to, and the disturbance impact brought by the switching process between the PID controller and the fuzzy controller also increases the disturbance of the system correspondingly, which is easy to cause frequent occurrence of overshoot

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