Optimal Adjustment Methodology for the Electric Mode Control System Non-Linear Regulator of Electric Arc Furnace

This article considers the methodology of optimal regulator coefficients selection as a part of electric mode control system of arc steelmaking furnace. An arc steel-melting furnace of shaft type SF-125 (85 MVA) with electric mode control system is selected as an object of research Ar-COS NT electric control system and a non-linear PI impedance controller. For the designated object of study the stages of application of the proposed methodology in practice are considered in detail. The mathematical model of the ArCOS NT control system with a nonlinear PI controller is described. With the help of the mathematical model the existing control system setup has been evaluated and conclusions about the necessity of its optimization have been made. New coefficient values of the non-linear PI controller, providing the controller operation in the mode close to a technical optimum, are suggested. The experimental research results of effectiveness estimation of developed methodology at operating SF-125 are presented, the technical effect is calculated, and scientifically substantiated conclusions are drawn about efficiency of suggested approaches.