A NEW TIME-DOMAIN VOLTAGE-SOURCE MODEL FOR AN ARC FURNACE USING EMTP

This paper presents a new time domain Controlled Voltage Source (CYS) model for an are furnace using the Electro Magnetic Transients Program (EMTP), The developed model is based on a piece wise linear approxima tion of the v-i characteristic of the are furnace load, In addition to this, the novelty of this simulation technique lies in the fact that the active power consumed by the load is also considered in the propos ed load model, thus making the proposed load model dependent on the op erating conditions of the load, Dynamic variation of the are is incorp orated through sinusoidal and band limited white noise variation of th e are resistance in the v-i characteristic of the are furnace load, De pending on the variation of the are resistance, the developed load mod el accurately represents both static (deterministic) and dynamic (rand om) are characteristics. While static are models are useful for harmon ic studies, dynamic models are useful for power quality studies and in particular, the study of voltage flicker, The results are compared wi th actual voltage measurements taken from a local utility to prove the validity of the proposed load model.