Simulations on Harmonic Analysis of Arc Furnace Electrical Arc Model

Harmonic problems are highlighted, when the electric arc furnace work steadily. Because the characteristics of an arc resistance is highly nonlinear, time variability and uncertainty, harmonic analysis and suppression is difficult. In this paper, a MATLAB/Simulink simulation model of the AC electric arc furnace system had been built on the basis of the parameters analysis of time-varying arc resistance. The new model simulated the electrical characteristics of an electric arc furnace which is operating steadily on the basis of the physical mechanism. This model is used for FFT harmonic analysis of electric arc furnace voltage and current. Simulation results of EAF in a steel plant show that the odd harmonics is the obvious main reason which caused the power voltage and current distortion. This Model is effective and easy to use; it´s proposed to lay the foundation for the harmonic suppression.