A Newly-Developed Control Method for Harmonic Mitigation in PV Grid-Connected Inverters Under Electric Arc Furnaces in Industrial Microgrids

A microgrid (MG) is a discrete energy system consisting of distributed generation (DG) and loads or nonlinear loads that is able to operate at the same time the main grid is operating. The DG units can operate in parallel with the main grid or in an MG mode. The unbalanced and nonlinear characteristics of numerous loads that are in connection with the power system have the potential to bring about some problems, in terms of power quality, which can affect other consumers. For instance, the electric arc furnaces (EAFs) cause considerable problems for power quality. The instantaneous power theory (pq) and the coordinate formulation (dq) are proposed in this paper for harmonic current compensation for PV grid-connected inverters and EAF in MGs. With the proposed control strategy under EAF conditions, the total harmonic distortions of the system current were decreased from 38.24% to 3.25%, which duly satisfies the IEEE 519-1992 standard.

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