Presenting High Speed Measuring Method for Optimal Capacity Utilization of SVC to Reduce Flicker in Electric ARC Furnaces

Electrical systems operators implement compensating equipment like SVC to compensate reactive power, enhance power quality, reduce voltage fluctuations and flicker. The effectiveness of utilizing these devices to compensate reactive power and decrease voltage fluctuations and flicker depends increasing their response speed. In the designing of these equipment, their response speed can be enhanced in different parts of these devices including control circuit, active and reactive power measurement circuits and switching devices. In this paper, it is tried to achieve a desired response speed by the aid of calculating the active and reactive power in the time less than a half-cycle and removing disturbing harmonics. Accordingly, the active and reactive power equations are derived in such a way that they are calculated within one-eighth cycle. Also, to exclude the harmonics, a simple and fast comparing filter based on the notch circuit in the main frequency is used. The proposed methodology has been designed and manufactured using EWB512 software. Finally, to evaluate the quality of the proposed method, an electric arc furnace in a steal company has been simulated and studied in the EMTP simulation package.