Abstract
Problem statement: The Electric Arc Furnace (EAF) is a non-linear load and creates power quality related problem. Therefore, accurate modeling of the EAF is essential. Approach: In this study, an optimal model for EAF in time domain called exponential-hyperbolic, was proposed to describe the behavior of the EAF for all of the operating conditions and it does not need the initial conditions as they needed for the existing methods of modeling of the EAF. Then, the behavior of the proposed model of EAF on the power system was studied using the PSCAD software. In order to analyze the proposed method, several characteristics for different operating conditions were investigated. Results: In the simulation, the parameters were taken from the EAF of the Mobarakeh Steel Making Company (Isfahan-Iran). The results of the simulation accurately showed the behavior of the EAF of the company. Conclusion: The finding of this study showed that the proposed exponential-hyperbolic model was capable in modeling of EAF for different operating conditions.
Highlights
The Electric Arc Furnace (EAF) is inherently nonlinear and time-variant loads and it can cause power quality problems such as voltage flicker, odd and even harmonics as well as unbalanced currents and voltages
It should be noted that in this study directly considers the effect of voltage flickering on the voltage arc furnace, in the frequency range of the human vision
Results for analysis of voltage flicker: In this part, the simulation of the voltage flicker using the random voltage is carried out based on Eq 8
Summary
The EAF is inherently nonlinear and time-variant loads and it can cause power quality problems such as voltage flicker, odd and even harmonics as well as unbalanced currents and voltages. These problems should be solved in the EAF. The sudden change of the current will not lead to sudden change of the arc characteristic. There is a hysteresis phenomenon in the dynamic of the arc characteristic due to the effects of the current in the previous instants of time on the present time. The time response of an electric furnace depends on the length of arc, positions of electrodes and topology the external circuit
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