Abstract

VALVERDE-GRANJA, Agustín; DE SOUZA, Teófilo M.  and  MAGALHAES-SOBRINHO, Pedro. Study of the electrical Power quality in the common connection point between a 7.8 kWp PV system and a low-voltage network. Ing. compet. [online]. 2018, vol.20, n.1, pp.63-73. ISSN 0123-3033.  https://doi.org/10.25100/iyc.v20i1.4222.

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 5001 standard, 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 % lower, and the voltage harmonics (TDH) increased 7, 0.8 and 3 % 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 % 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.

Keywords : Low voltage network; Power quality; solar PV system; experimental network.

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