MEASUREMENT ANALYSIS AND SIMULATIONS OF POSSIBLE SVC SOLUTION FOR A SLOVENIAN STEEL COMPANY

This report presents simulations of a possible static VAR compensator for Ravne steel works. The task of the SVC system is to mitigate the high flicker levels to acceptable limits. The simulations are based on real field measurements performed on March 31st to April 3rd 2006 by Prof.Dr.Igor Papic and Dr.Bostjan Blazic of the University of Ljubljana under normal furnace operations. As result of these measured data an SVC Light system was proposed to mitigate flicker. In this paper the proposed SVC Light® system was simulated showing the results for voltage profile, power factor correction and flicker mitigation using the electromagnetic computer program PSCAD/EMTDC Version 4.2.0 from Manitoba HVDC Research Center Inc. For the simulations, the field measured currents were injected into the computer model to reproduce exactly the actual EAF and LF conditions. A time window (15 minutes) corresponding to the maximum flicker level recorded during the measurement period has been selected for the digital simulations. The simulation shows that the maximum flicker level at PCC (Ravne 110 kV substation) can be decreased from about 5.8 to 1.15 using a SVC Light rated for 64 MVA. The voltage/current unbalance and distortion emitted by the industrial plant has been evaluated from the measured data. With the proposed SVC Light, the power quality will be improved substantially.