Abstract
Electric arc furnaces (EAF) are widely used in the steel production industry. They are unbalanced, nonlinear and time varying loads. These loads cause voltage flickers harmonics and perturbations of the grid, which decrease energy efficiency and power system quality in the system. In order to reduce these impacts, a Static Var Compensator (SVC) is use and connected in parallel with EAF. However, passive elements in SVC occupy a large volume and have a high cost. Therefore, in the paper, the author optimizes passive elements to compensate reactive power and to decrease the harmonics in SVC. Firstly, a studied model is built to study the impact of the arc furnace on the power system. It is implemented in Matlab/Simulink. The EAF arc model based on a linearization of the arc voltage-current characteristic. Secondly, an SVC is added in parallel with EAF in studied model to compensation of the reactive power and to filter some harmonics. Finally, the filters in SVC are designed by optimization to reduce their volume, to filter dominant harmonics (5th and 7th), to improve energy efficiency of EAF and to enhance power system quality.
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