A dynamic, nonlinear and time‐varying model for electric arc furnace

SUMMARY Electric arc furnace (EAF) is a nonlinear and time-varying load that causes power quality problems such as voltage flicker and harmonics. Field measurement of voltage and current from EAFs in Mobarakeh Steel Company in Isfahan-Iran are used to introduce a comprehensive model for EAF. A new dynamic, nonlinear and time-varying model is presented here. In other words, the function between EAF voltage and current is nonlinear, differential and with time-varying parameters. By using the recorded data, the order of the dynamic part is determined by a new approach. The nonlinear characteristic is modeled with proper polynomial functions. All parameters related to the dynamic and nonlinear functions are considered time varying as time series. Autoregressive moving average (ARMA) models are implemented and the suitable ARMA order is attained for all EAF time-varying parameters. Copyright © 2014 John Wiley & Sons, Ltd.

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