A novel method for estimating voltage flicker

This investigation develops an enhanced method for estimating the voltage fluctuation (/spl Delta/V/sub 10/) of the electric arc furnace (EAF). The method not only considers the reactive power variation but also the active power variation in calculating the estimated /spl Delta/V/sub 10/ value of ac and dc EAFs. This study also considers field measurements of ac and dc EAFs. The results reveal that the estimated /spl Delta/V/sub 10/ value is significantly smaller than the observed value. The conventional way of estimating /spl Delta/V/sub 10/ is ineffective. The survey results demonstrate that variations of active power and reactive power of EAFs are strongly alike. Meanwhile, an /spl Delta/V/sub 10/ estimate must account for the effect of active power variation. However, this study proposes a maximum apparent power fluctuation method that can yield a more accurate /spl Delta/V/sub 10/ estimation than the conventional method.