Influence of Harmonic Filters on the Operation of AC Arc Furnace Power Installation

AC arc furnaces are electric energy receivers with chaotic consumption of non-sinusoidal currents, especially in the first phase of steel melting. Due to current distortions and their inductive nature, passive harmonic filters, SVC reactive power compensation systems and active filters are used in arc furnace installations. The paper presents the parameters of electric power quality in installations of arc furnaces. The spectrum of harmonics and THD indices for voltages and currents on the medium voltage side for two operating modes-on and off state-of passive filters were calculated using Fast Fourier Transform on the basis of computer-recorded measurement data. The damping coefficients for voltage harmonics and the gain coefficients for current harmonics were determined. Graphs of P, Q and S power are shown for the harmonic filters on and off.