Analysis of electric energy quality in arc furnace system with follow-up SVC compensation

The paper deals with analysis of electric power quality ratings in installation of an arc furnace with a battery of passive LC filters and a tracking static VAr compensation. On the basis of recorded waveforms of voltages and currents in individual circuits of an internal autonomous power network during cast process we evaluated waveforms of the electric power. Experiments were conducted for the on and off state of the compensating devices. Computations of the higher harmonics content in the waveforms of voltages and currents for individual circuits of the arc furnace installation were conducted using the DASYLab software and its fast Fourier transformation (FFT) block. The cross correlations among coefficients determining the power consumption and the harmonics content were evaluated for separated operation intervals of the arc furnace, working as a nonlinear load, and the mating passive filters as well as the thyristor static VAr compensator (SVC).