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Power Quality Improvement of an Electric Arc Furnace Using a New Universal Compensating System  

Esfandiari Ahmad (Dept. of Electrical Eng., Sharif University of Technology)
Parniani Mostafa (Dept. of Electrical Eng., Sharif University of Technology)
Mokhtari Hossein (Dept. of Electrical Eng., Sharif University of Technology)
Ali Yazdian-Varjani (Dept. of Electrical Eng., University of Tarbiat Modares)
Publication Information
Journal of Power Electronics / v.6, no.3, 2006 , pp. 195-204 More about this Journal
Abstract
This paper presents a new compensating system, consisting of series and shunt active filters, for mitigating voltage and current disturbances. The shunt filter is used to compensate for unbalanced and distorted load currents. The series filter comprises two inverters, used to suppress voltage disturbances and handle source currents independently. This configuration is devised to reduce the overall cost of active compensators by using low-frequency high-current switches for the latter inverter. The filters are controlled separately using a novel control strategy. Since voltages at the point of common coupling contain interharmonics, conventional methods cannot be used for extracting voltage references. Therefore, voltage references are obtained from generated sinusoidal waveforms by a phase-locked loop. Current references are detected based on rotating frame vector mapping. Simulation results are presented to verify the system.
Keywords
power quality; active filters; electric arc furnace; voltage flicker;
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