Study On Control Strategy Of Electrode Regulator System Of Arc Furnace

Electric arc furnace (EAF) is one of the main advanced technologies of modernsteelmaking. EAF relies on high-temperature arc to smelting iron and steel, which isproduced by discharge between the electrodes and the furnace material. Electric furnacesteelmaking has many advantages, and they are mainly in short process, high thermalefficiency, energy conservation, environmentally friendly and other areas. EAF controlsystem is a nonlinear, time-varying and random interference serious complex system, atthe same time there are coupling effects between the three-phase electrodes.This paper bases on60t EAF in a steel mill as research background, consulting alarge number of literatures, then overviews of the history, current research status anddevelopment prospects of the EAF steelmaking. The composition of equipment and thesmelting process are described in this article, and the characteristics of the majorperiods of the smelting process are detailed in it. By comparing the control strategies,the method of constant impedance is determined to be used in the EAF, because of itsreliable, automation and anti-jamming.The composition part and the mechanism of AC arc are detailed in this paper, inorder to establish an arc model. Through the EAF system modeling, the couplingbetween the three-phase electrode arc and the arc current is analyzed. So a fuzzycontroller, which is used to compensate and decouple, is introduced based ondecoupling method of the current compensation. Simulation is effectively and well,which is made on decoupling performance and noise immunity.The main task of the EAF control system is to adjust the electrode position. Afteranalyzed the shortcoming of traditional PID control, a compound intelligent controlmethod is designed in this paper, which combined fast optimal control and self-turningcontrol. The compound control method can meet the requirements of the electrodecontrol system, that it should be rapid in the initial melting period and high accuracy atthe later stage. After the simulation experiment for a variety of possible disturbance inthe furnace, it is proved that the compound intelligent control method are able to meet the different performance requirements in each smelting period.