Double-Circuit Control System of the Electric Mode of an Arc Furnace with a Fuzzy Phase-by-Phase Asymmetrical Adjustment of Arc Lengths

A double-circuit automatic control system (ACS) of the electric mode (EM) of an arc furnace (AF) is developed. A model of a fuzzy phase-asymmetric rule for arc length regulation is proposed. A block diagram is developed and the design of an element for generating a mismatch signal of EM for AF is carried out according to the developed fuzzy rule. A Simulink-model of the developed double-circuit ACS of EM has been developed and comparative computer simulations of the quality indicators of controlling the EM coordinates for the proposed double-circuit structure of the ACS and the serial arc power regulator ARDM-T-12 of the DSP-200 arc furnace are carried out. The results of the comparative analysis have shown an improvement in a number of AF energy efficiency indicators and an increase in the dynamic accuracy of EM coordinate stabilization when regulating random disturbances by the double-circuit structure as compared to the arc power regulator ARDM-T-12.