ARC-FURNACE MODEL FOR THE STUDY OF FLICKER COMPENSATION IN ELECTRICALNETWORKS

This paper presents an arc-furnace model consisting of non-linear, tim e varying resistance where two different time-variation laws of arc le ngth are considered. One consists of a periodic, sinusoidal law, the o ther of a band-limited white-noise law. The arc-furnace model is imple mented by EMTP, referring to actual electric-plant configurations. Sim ulations are reported where the values of flicker sensation and short- term flicker severity, P(ST), are determined according to UIE specific ations. It results that the model based on sinusoidal time-variation l aw can be useful for worst-case approximations, while the model using white-noise law is able to fit flicker measurements made in electric p lants supplying arc furnaces. The models are used to investigate the e ffect on flicker compensation of the insertion of series inductors at the supply side of the furnace transformer. It is shown that considera ble reduction of P(ST) is obtained at the point of common coupling by series inductor installation at constant furnace active power.