Abstract
Electric Arc Furnaces (EAFs) play an essential role in the production of superior quality steel, using metal scrap as raw material. However due to its non-linear electrical characteristics, it creates lot of power quality problems in the 3-phase 4-wire power distribution system. In this paper, time domain based hyperbolic EAFs model is considered as an unbalanced, time-varying non-linear load and the power quality issues created by EAF are considered. A four-leg distribution static compensator (FL-DSTATCOM) is utilized for elimination of current harmonic and 3-phase current imbalance. Simultaneously, it nullifies the current flow in the neutral conductor, compensate the reactive power and rectify the poor PF which are caused by the EAFs in the power distribution system. The FL-DSTATCOM injects reactive and harmonics components of furnace current extracted using synchronous reference frame theory. In order to evaluate the compensation capability of FL-DSTATCOM under static and dynamic furnace loading conditions, the digital simulation is carried out using MATLAB/SIMULINK. The simulation results demonstrate that the FL-DSTATCOM is capable of making the supply current balanced and sinusoidal. It also helps in maintaining the power factor at point of common coupling near to unity and reduces the supply neutral current very close to zero.
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