Avaliação das Violações dos Limites de Tensão em uma Rede de Distribuição de Energia Elétrica após a Inserção de uma Unidade de Geração Distribuída Fotovoltaica

e320

Abstract

This work presents an evaluation of the voltage values at the point of common coupling of a
secondary electricity distribution network after the insertion of a photovoltaic distributed
generation unit, located in a city in the northeast of Brazil. With this evaluation, it was possible to
verify whether after the insertion of photovoltaic distributed generation there was a violation of the
voltage limits determined by the National Electric Energy Agency. To evaluate the voltage values,
computer simulations of a real distribution network were carried out, considering its constructive
characteristics, as well as the power demand of the consumer units connected to the network, the
installed power of the generation unit and the local solar power and temperature. The simulations
were carried out considering the months of the year to analyze the influence of seasonality on the
change in the simulated voltage values. With the results obtained, it was found that the insertion of
photovoltaic distributed generation can cause more than 20 violations of the voltage limit over the
months, causing financial damage to the energy concessionaire. Voltage limit violations occurred
45.83% of the time at 1 pm, indicating that the occurrences are recurrent at times of high generation
and low consumer demand, increasing the voltage value at the common coupling point of the
distribution network. Thus, it was possible to identify the instants in which the operation of the
protection system of the distribution network is compromised, so that later it is possible to propose
methods to regulate the voltage at the point of common coupling.