Power factor improvement for high power low voltage AC arcs

The operation of two series-connected static voltampere reactive (VAR) compensators suitable for 3 phi AC arc loads is described. The circuit model for an arc furnace and factors contributing to the determination of the equivalent circuit parameters are discussed. Two types of active compensators, shunt compensators and a cycloconverter are discussed briefly. The operating principles for a single phase of the current-source-fed and voltage-source-fed converter, three-phase power circuit representations, and the analysis for a single phase of a current and voltage-driven series converter, including graphical results, are presented.<>