Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-10-02T23:37:04Z No. of bitstreams: 1 EvandroAilsonDeFreitasNunes_DISSERT.pdf: 2832434 bytes, checksum: fbd09520d8dfca43784e60b088545e00 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-10-07T00:23:58Z (GMT) No. of bitstreams: 1 EvandroAilsonDeFreitasNunes_DISSERT.pdf: 2832434 bytes, checksum: fbd09520d8dfca43784e60b088545e00 (MD5) / Made available in DSpace on 2017-10-07T00:23:58Z (GMT). No. of bitstreams: 1 EvandroAilsonDeFreitasNunes_DISSERT.pdf: 2832434 bytes, checksum: fbd09520d8dfca43784e60b088545e00 (MD5) Previous issue date: 2017-06-30 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Atualmente, os incentivos ? gera??o de energia el?trica a partir da fontes consideradas limpas v?m aumentando consideravelmente devido ? escassez dos combust?veis f?sseis, at? ent?o utilizados em abund?ncia. Em paralelo, unidades de gera??o distribu?da que utilizam fontes renov?veis tamb?m ganha for?a com a diminui??o dos impostos aplicados sobre os componentes constituintes dos sistemas de gera??o que utilizam este tipo de fonte de energia. No entanto, a qualidade da energia el?trica tem sido severamente afetada pelo aumento do n?mero desses sistemas ligados ?s redes de distribui??o de baixa tens?o. Com base nisso, nesta disserta??o s?o avaliados os impactos na rede de distribui??o de energia el?trica decorrentes da conex?o de instala??es fotovoltaicas, em v?rios n?veis de penetra??o. Nesse intuito, ? realizado um estudo de caso que consiste em operar uma planta fotovoltaica de 9 kWp conectada ao ponto de acoplamento comum de uma subesta??o com pot?ncia nominal de 15 kVA. O sistema fotovoltaico utilizado, se divide em: i) sistema trif?sico fixo de 8 kWp e ii) sistema monof?sico fixo de 1 kWp. A avalia??o ? feita com base nos indicadores da qualidade da energia el?trica, que indicam as caracter?sticas de pot?ncia, harm?nicos de tens?o e corrente, desequil?brios entre fases do sistema e regula??o do fator de pot?ncia. A partir da an?lise desses indicadores, obtidos com aux?lio da transformada discreta de Fourier, ? realizada uma an?lise do impacto gerado pela planta fotovoltaica no ponto de conex?o com a rede el?trica. Por meio de resultados experimentais, os indicadores s?o estimados durante a opera??o do sistema fotovoltaico e s?o analisados e comparados com o padr?o internacional estabelecido pelo IEEE (do ingl?s, Institute of Electrical and Electronics Engineers). / Currently, incentives for clean energy generation have been increasing considerably due to the limitation of fossil fuels, until then used in abundance. In parallel, distributed generations increase with the reduction of the taxes of the embedded components of the renewable energy sources. However, the power quality (PQ) has been severely affected by the increasing number of these types of energy sources connected to low voltage distribution networks. In this dissertation, the impact on the utility grid will be evaluated under varying levels of a photovoltaic system penetration. A 9 kWp photovoltaic plant, composed of three system topologies connected to a 15 kVA substation common coupling point, will be carried out: a 8 kWp three-phase fixed topology and a 1 kWp fixed single phase. These photovoltaic systems are power electronics based devices, such as inverters constructed from semiconductor switches, which, due to their construction and operation, affect the waveform of the electrical voltage and current, deteriorating the PQ. From the analysis of PQ indices, obtained by means of discrete Fourier transform, for power characteristics, voltage and current harmonics, imbalanced levels among system phases and power factor regulation, an analysis of the impact generated by the photovoltaic plant at its point of connection with the utility grid will be performed. The indices will be analyzed and compared to the standards established by the Institute of Electrical and Electronics Engineers (IEEE) in order to evaluate the impact caused by the connection of the photovoltaic system at the PCC.