An arc‐furnace model consisting of non‐linear, time‐varying resistance, realized by the Alternative Transients Program (ATP), is presented in this paper. It is shown that the model is appropriate for flicker investigation in electrical networks supplying arc furnaces, constituting a valid alternative to the linear arc modelling realized by amplitude modulation of voltage generators. Block diagram of the procedure for ATP modelling of the nonlinear, time‐varying arc resistance, dynamic voltage‐current characteristic of the furnace electric arc, voltage and current arc waveforms and characteristic curves of an arc furnace, obtained by ATP simulation, are presented, referring to circuit parameters taken from an actual plant and to a sinusoidal law for arc‐length time variation. Aflickermeter ATP simulation is realized to derive equivalent voltage‐variation values in agreement with the actual flicker measurements.
The effect of a series inductor on the reduction of voltage flicker in electric power systems supplying arc furnaces is assessed. The arc furnace is simulated as a voltage generator with variable amplitude during the melting process. The design of the inductor hinges on the fact that, when connected into the electric power system, it should not interfere with the production capacity of the plant itself. The use of a powerful simulation program (EMTP) makes it possible to study a large number of cases and therefore to determine the appropriate size of the series inductor for the purpose of reducing voltage flicker. The simultaneous presence of the series inductor with capacitors and/or filters, with the purpose of limiting harmonic pollution and improving the power factor, is also discussed
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