Fuzzy Logic Control of Three Phase Submerged Arc Ferrosilicon Furnace

Research is made into the fuzzy control of electrode regulator systems of submerged electrical arc ferrosilicon furnace EAF. The equations of the electrode currents and furnace resistances are derived based on certain model for the submerged arc ferrosilicon furnace. This model takes into consideration the walls of furnace and the heat losses into external medium in addition to the heat transfer of the system. The main purposes of the modelling are for the simulation and evaluations of different control schemes. In particular, the part of the system associated with the control of the three phase electrode currents, which is done by examining the positioning of the electrodes. The obtained results indicate that the developed simple linear model includes all critical factors needed in the simulation. Different electrode position based control schemes for electrode current control of the furnace is examined. The results of simulation show that fuzzy logic control systems have better dynamic characteristics than PD conventional control systems, and greatly strengthen the capability of restraining disturbances of arc length. Index Terms Arc resistances, Models, Electrodes, Fuzzy control, Industrial process.