Harmonics of the Microinverters for the Operation of the Grid-Connected Photovoltaic Energy System Considering the Uncertainty of Irradiance

Acero J.F.C.; Castañon N.J.B.; Yucra R.C.; Viveros H.P.; Coaquira A.M.L. · Smart Innovation, Systems and Technologies (2022) · DOI: 10.1007/978-3-031-08545-1_68

Resumen

To evaluate the relevant parameters for the study, such as the power factor and the total harmonic distortion in the current (THDi) and voltage (THDv), we use Microinverters, all of them connected to the grid. The objective of this work is to verify the effects of the operation in the connection of the photovoltaic system to the distribution network in RMS voltage, RMS current, balancing in a three-phase star form; as well as identifying the power quality parameters for injection into the grid. The system under study has an installed power of 2 kWp. Measured on the boards present an imbalance in their phases as a result of the photovoltaic sources, which produces an increase in current through the neutral conductor and therefore it is advisable to balance the phases in terms of the power supplies. The results of June 24, 2021, with a frequency of 60 Hz for maximum RMS values in phases A (microinverters), were 9.30 A and, for the voltages, they were 302.50 V, respectively. The active and reactive powers are 1380 W, 241 Var phase A (microinverters). In the percentage values of the harmonic current, they increase when the solar irradiance decreases, we have as the most critical with irradiance close to 0 W/m2 with 99.94% THDi, On the contrary, it can also be observed that reaching an irradiance of 1200 W/m2 the THDi in the currents of the three phases decreases.

Instituciones: Universidad Nacional del Altiplano; Universidad Nacional de Juliaca