Evaluating the quality of the local grid supply voltage with arc furnaces
Keywords:
Arc furnace model, Harmonic distortion, Voltage distortion, Current distortion, Power quality problemsAbstract
Electric arc furnaces are widely used in many steel companies. The arc furnace can be considered as an unbalanced load with nonlinear and time-varying nature. Therefore, in order to have a permission to be connected to the grid, it is required that the effect of the arc furnace has to be evaluated and the local power system quality should be maintained at a level specified by authority. However, since the arc furnaces exhibit their nonlinear and time-varying characteristics as mentioned above, it is not easy to obtain an accurate model of a real arc furnace. This paper presents a modification of arc furnace models based on the classical Cassie and Mayr equations. The obtained appropriate model can be used in reality to appraise the quality of the local supply grid with the arc furnaces. The flicker calculation as well as the simulation results show that the nonlinearity of the arc furnace produces the distortion of the secondary voltage of the supply transformer but this may not make significant effect on producing harmonics to the grid.
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