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Among the many nonlinear loads, electric arc furnace (EAF) is a potential source of sub-harmonic currents. Again, turbine-generator (T-G) shaft possesses natural frequencies in the sub-synchronous/subharmonic range. If those sub-harmonic frequencies match to natural frequencies there occur amplification of torsional oscillating torques transmitted among the masses of T-G shaft. This may lead to damage rotating shaft, especially T-G shaft, in the system. This paper assesses the severity of amplified oscillating torques on TG shaft due to multiple EAFs connected to same point of common coupling (PCC). This paper also assesses the impact due to relative location of EAFs from power stations. For this purpose, a lumped-mass model of T-G shaft and mathematical model of electric arc have been considered. EAFs have been connected to the same PCC and their effects on T-G shaft have been measured with/without resonant excitation of torsional modes.

Impact of Torsional Resonance in Turbine-Generator Shaft Due to Multiple EAF Operation