Estudio de la calidad de la energía en el punto común de conexión entre una red de baja tensión y un sistema solar fotovoltaico de 7.8 kWp

Abstract

An experimental 1,000 kWh/month PV solar system was connected to a low-voltage network at the Universidad de
Ibagué, Colombia. In this work, we present the findings about the electrical voltage issues in the common connection
point. The characterization of the low-voltage network was based on the NTC 5001standard, including aspects such as
voltage imbalance, intermittency, short and long-term flicker, and harmonics. The maximum energy production was
850 kWh /month, equal to the 72.65% of the total installed capacity. In this condition, the minimum voltage measurements
evidenced a 2 % increase from the previous value, the voltage imbalance was 3.5 to 70 percent lower, and the
voltage harmonics (TDH) increased 7, 0.8 and 3 percent in the phases U1, U2 and U3, respectively. Current harmonics
did not show significant increases in lines U2 and U3, line U1 recorded an increase of 22%, but there were no significant
variations in the short and long-term flicker, notches and interruptions. Regarding the electrical power, the active and
reactive components increased 58 and 42%, respectively, and the thermographic study indicated a 7.5 percent increasing
temperature after the installation of the experimental PV system. This experience aims to be a reference project in
the implementation of the Act 1715 of the Colombian government to promote solar systems.