Negative Voltage Sequence Control for an Electric Arc Furnace Power Supply based on a Multilevel AC-AC Converter

This paper proposes a novel control approach for a back to back multilevel AC-AC converter in Electric Arc Furnace (EAF) power supply applications. The study presents a feasibility analysis about the use of the chosen converter structure for EAF applications, along with considerations for control mechanisms. In particular, the effect of both positive and negative voltage sequences on the system is explored. Through comprehensive analysis, the paper introduces a novel control method utilizing negative voltage sequence, aiming to enhance the overall system performances. The results are presented using both a simplified model and the Cassie-Mayr (CM) model for the EAF.