Abstract

The multifunctional operation of photovoltaic (PV) inverters consists in using the PV inverter for ancillary services as reactive power injection and harmonic current compensation. The multifunctional operation can improve the ac-grid power quality. Thus, this paper presents a dynamic method based on the Second Order Generalized Integrator coupled with a Phase Locked Loop (SOGI-PLL) structure to detect the most predominant harmonic current components in the distribution system. This work intends to show the improvement of the detection method by the use of negative feedback on the SOGI. It is used an extension of this detector to detect multiple harmonic currents according to its amplitude. Besides, the influence of the discretization method is presented and the error in this conversion is analyzed. At last, it can be seen a performance improvement in the detection of the harmonic current amplitudes.

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