Analysis of new electric arc furnace influence in steel-plant CMC Sisak upon voltage quality at point of common coupling.

Abstract

In this study, the influence of the 60 MVA electric arc furnace, which is planned to be installed in the CMC Sisak steel plant, on the voltage quality on the 110 kV busbars of TS Zeljezara was analyzed based on two standard quality indicators, harmonic distortion and voltage flicker. In order to compare the results of the analysis with the limitations defined by the corresponding international norms, the study first provides an overview of these norms. This is followed by a presentation and analysis of the results of measurements carried out on the primary side of the transformer in TS Zeljezara, through which it is planned to power a new electric arc furnace, and today a 12.5 MVA furnace is powered through it. In the fourth chapter, an analysis of the impact of the new electric arc furnace on voltage quality is given, considering harmonic distortion and flickering of the voltage at the connection point. This analysis, in addition to the already mentioned measurements of the current values ​​of the electric arc furnace in the Split ironworks, is based on data on the substitute reactance of the network at the connection point for characteristic operating conditions. The values ​​of these reactances are determined from data on short-circuit currents obtained from the Transmission System Operator. The analysis was carried out using the Matlab software package, whether existing program routines were used or new programs were developed for some specific processing, such as the determination of time-varying harmonics or flicker calculation.

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.