Abstract
The paper deals with consideration of the improved mathematical model of the automatic electrodes’ position control system of electric arc furnaces (EAF) and ladle furnaces (LF). As a simplification the mathematical model has been presented in one-phase form. It consists of: 1) model of furnace’s electric circuit with non-linear equation Cassie describes instantaneous admittance of electric arcs, 2) model of hydraulic electric drives with servovalves which have non-linear regulation characteristic, 3) adaptive non-linear impedance regulator. Comparison between traditional structures of the non-linear impedance regulators using inside electrodes position control systems “ARCOS” (Siemens VAI) and “HI-REG” (Danieli) and improved regulator in new control system “RADUGA PK” is considered.
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