Abstract
Electrical arc furnace (EAF) is a nonlinear and time-varying load consuming low frequency fluctuating power. This results in mechanical fatigue in the nearby small scale synchronous generators (SSSGs), especially their corresponding turbines, that reduces their lifetime. Furthermore, to improve the power supply reliability and reduce electricity expenditures, utilizing SSSGs is inevitable. In this paper, an industrial EAF is modelled and verified based on the field measurement studies; moreover, an actual islanded microgrid including an EAF and an SSSG is studied to quantize the effect of EAF fluctuations on the SSSG mechanical parameters based on the introduced appropriate indices. In addition, the SSSG controller parameters are properly determined to alleviate the mechanical torque fluctuations. The use of the proposed practical and simple method without imposing any additional cost decreases the SSSG mechanical oscillation magnitude considerably.
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