Estimation of Electric Arc Furnace Influence upon Flicker and Voltage Harmonics Distortion at Point of Common Coupling

Abstract

The paper presents a procedure for assessing the influence of an electric arc furnace on voltage flicker and harmonic distortion at the connection point. For this purpose, a mathematical model of the electric arc furnace - network system was developed, which simulates the instantaneous voltage values ​​at the connection point in order to analyze the flicker and harmonic distortion of the voltage at that point. The model was created in the Matlab-Simulink software package. A current source model was used for the electric arc furnace, and the equivalent network was modeled as a three-phase ideal voltage source with an equivalent inductance in each phase. Due to the stochastic nature of the furnace current waveforms, a special digital signal filtering procedure was used to analyze the harmonic distortion of the voltage at the connection point. A program was developed in the Matlab software package to calculate the short-term and long-term flicker intensity, based on the IEC 1000-4-15 standard. The impact of the new 60 MVA electric arc furnace, which is planned to be installed in the ironworks CMC Sisak, on the quality of the voltage on the 110 kV busbars was analyzed.

Božo Terzić

Full Professor | Department of Electrical Drives and Industrial Control

Full professor at the Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture in Split, with significant contributions in the field of industrial development projects including the design of prototypes of electronic converters used in industrial plants around the world. His research interests are focused on the application of electronic converters in electric drives and renewable energy sources.

Goran Petrović

Full Professor | Department of Electrical Measurements

Prof. dr. sc. Goran Petrović is a full professor at the Faculty of Electrical Engineering, Mechanical Engineering and Architecture in Split. His research interests include measurement of electrical and process quantities, analysis of geoelectrical and geothermal features of the soil, instrumentation for smart grids, measurement and application of synchrophasors. He is the author of numerous papers published in top-tier scientific journals and contributed to valuable international and national scientific projects.

Marin Despalatović

Full Professor | Department of Electrical Drives and Industrial Control

Full professor at the Faculty of Electrical Engineering, Mechanical Engineering, and Naval Architecture in Split, where he teaches courses Electric Machines, Electric Drive Systems, and Electromechanical System Modeling. His research focuses on power systems, energy storage, and smart grid technologies, with active participation in multiple national and international projects aimed at advancing energy infrastructure and improving system stability.