Analysis of Impact of One Unit of Distributed Photovoltaic Generation in Power Quality of a Rural Property

Abstract

This paper presents the analysis of the power quality before and after the installation of distributed photovoltaic generation units at the delivery point (distributor/consumer) of a rural property dedicated to milk production in the city of Medianeira, located in the western region of the state of Paraná. Measurements of the aspects that describe the energy quality of the property in question, such as steady state voltage, power factor, frequency, fluctuation, unbalance and voltage harmonics, and short duration voltage variation were performed. The values obtained in these measurements were then compared to the limits considered adequate, according to the procedures of distribution of electric energy in the national electrical system. To carry out these measurements an IMS power quality analyzer model PowerNET PQ - 700 G4 was used. It was found that the limits of three aspects related to the quality of electric power were violated prior to the installation of the photovoltaic panels, which are the power factor, voltage fluctuation and short voltage variations. After the installation of the system, there were improvements in the steady state voltage levels. In addition, a reduction of power factor and fluctuation, imbalance and harmonic distortions of voltage were obtained. The work is finished suggesting solutions to the most relevant problems related to product quality.