Research and Development of Automatic Control System for Electric Arc Furnace Electrode Positioning

Abstract

The article is concerned with the advanced automatic control system of electrode positioning at electric arc steel making furnaces and ladle furnaces. Analysis of structure of modern electrode positioning control systems’ nonlinear controllers for electric arc furnaces and ladle furnaces is considered. Disadvantages of these systems were analyzed. A control system with a conventional structure from well-established foreign suppliers was compared with the advanced automatic control system of electrode positioning.

Double-Circuit Adaptive System of Fuzzy Phase-Autonomous and Energy-Efficient Control of Arc Furnace Electric Modes

“…Modern arc steelmaking furnaces are equipped with electromechanical and electrohydraulic systems for moving electrode arc power regulators. Their main task is to ignite arcs and stabilize their lengths and coordinates of the electrical mode at the level of specified, in particular optimal, values [1,[11][12][13][14].…”

“…The use of artificial external characteristics of the arc furnace (Figure 2) in the proposed structure of a double-circuit arcs power automatic control system (Figure 1) makes it possible to implement various strategies of adaptive multi-criteria optimal control of the melting process electrical modes. But unlike the known solutions for this [11][12][13][14][15][16][17], which are based on the use of mainly technological influences or constructive solutions, variable artificial external characteristics are electrical control influences. They are characterized by higher speed for obtaining high dynamic accuracy of arc currents stabilization, as well as much wider functional properties for operational implementation of multi-criteria optimal control.…”

Optimal control of the electrical mode of an arc furnace on the basis of the three-dimensional vector of phase currents

“…The mathematical and computer models of control systems of electric arc furnaces operation modes suggested in [3][4][5][6][7] have some advantages and disadvantages, which are determined by the completeness and accuracy of the description of electric modes, by the complexity and precision of state identification, and by the conveniences in use and adjustment. The results obtained in these works demonstrate a slight improvement in energy efficiency and electromagnetic compatibility, firstly due to the use in the synthesis of controlling influences of the models that with a not high accuracy describe the nature of the real processes of changing the coordinates of the electric mode, as well as due to the high level of sensitivity of the indicators of the quality of the dynamics to the change of the parameters of an object to be controlled, which is extremely undesirable under the conditions of non-stationary parametric continuous disturbances in the furnace power circuit and in the phase arc intervals.…”

Synthesis and Analysis of Arc Furnace Electrical Mode Control System on the Basis of Three-Dimensional Phase Currents Vector Distribution

“…The mathematical and computer models of control of electrical modes of the three-phase arc furnaces proposed in the papers [5][6][7][8][9] have certain advantages and disadvantages among themselves in terms of the completeness and accuracy of the description of modes, identification of states, conveniences in use and readjustment, but they do not meet the above requirements for energy efficiency and electromagnetic compatibility modes in full, primarily due to the inadequacy of the control models to the nature of the real processes of changing the coordinates of the EM, also because of the high sensitivity of the obtained dynamics to changing parameters of the control object, which is highly undesirable in terms of continuous action of stochastic parametric disturbances in the power circuit of the furnace and in phase arc gaps.…”