Análise da qualidade de energia elétrica proveniente de uma planta solar fotovoltaica conectada à rede de distribuição de energia

Ce document présente l'analyse de la qualité de l'énergie dans une centrale solaire photovoltaïque - avec une capacité installée de 1 MWpico, relié au réseau de distribution d’électricité en 11,9 kV, qui a comme but connaître et également de comparer à la norme nationale actuelle, les effets de la qualité de l'énergie électrique résultant de l'utilisation de cette type matrice génératrice. Le rapport a été basé sur des niveaux spécifiés dans le module 8 des Procédures de distribution d'électricité dans le réseau national d'électricité - PRODIST, qui précise les directrices sur la question de la qualité de l'énergie électrique sur le territoire brésilien. Il a été considéré aussi les recommandations internationales 929 et 1547, qui proposent des pratiques recommandées concernant des systèmes de génération de l'énergie solaire PV (photovoltaïque), et également des normes pour le raccordement de ces types de sources au réseau de distributions d'électricité, tous deux établis par l'Institut des ingénieurs électriciens et électroniciens, largement connu comme IEEE. Le développement et le travail sur le terrain a eu lieu de manière continué, et non dans des moments spécifiques, assurant de cette manière, la fiabilité des données obtenues

A influência da temperatura nas impedâncias de sequência de condutores utilizados na rede primária de distribuição

Distribution networks are formed by long lines that carry electricity substations to homes and industries. These lines have associated impedance and depending on operating conditions of the network these impedances may vary. This paper provides a detailed analysis of the effects observed in studies of voltage drop, short circuit and electrical losses, when considered the drivers sequence impedances used in primary distribution network at different temperatures. Therefore, it is initially presented a calculation methodology and details the factors that influence the final values. The methodology presented tackles in a practical way the main factors that directly or indirectly influence the values of the impedances as an emblematic example and will be properly dealt with throughout the paper is the effect of temperature on the values of the sequence impedances. More specifically is dealt with the case of XLPE cables protected, by having a higher maximum operating temperature than the operating temperature of the network. The effects observed in the power flow generated when considering the impedance values at both temperatures were analyzed. The impedance drivers tend to increase with increasing temperature. Thus the impedance of the conductor XLPE protected will tend to be greater for the maximum operating temperature for which the operating temperature of the network, resulting in greater voltage drop and higher electrical losses

Alocação de modem PLC utilizando SNR em uma rede elétrica de baixa tensão

Pós-graduação em Engenharia Elétrica - FEIS

Modelos dinâmicos simplificados, para verificação do comportamento de rede de satélites amarrados por cabos flexíveis, usando-se o método explícito das diferenças finitas

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Uso de redes neurais com adaptação de pesos por modos deslizantes para controle de sistemas e aplicações em máquinas elétricas

Pós-graduação em Engenharia Elétrica - FEIS

A internet e a prática da leitura: o uso da rede por acadêmicos do sexto período do curso superior em Tecnologia em Alimentos

Pós-graduação em Educação - FFC

Desenvolvimento de um sistema on line de avaliação para análise do desempenho escolar: um estudo exploratório sobre avaliação em rede

Pós-graduação em Educação Escolar - FCLAR

O ensino de redação em sites: diálogos em rede

We know that studies on reading and writing take place within the Linguistic for several decades and, with de computer, the language entered the network and this is opening a learning space for writing classes, no more reduced to a classroom but expanded to a universe that has no geographical boundaries, namely de Internet. Our research fits into this context and is part of the project The discourse on writing practices in contemporary Brazilian media: the art making, the pedagogical practice, and the production of meaning to develop discourse analysis on the practice of writing on sites dedicated to teaching and learning of this practice. The main objective of this research is to investigate the relationship between school attendance of redaction - made here as discourse gender, as you know Bakhtin - and the discourse of the sites that constitute our corpus. We set out the hypothesis that the sites are intended for the teaching/learning of writing seeking to create virtually teaching imaginarily conditions similar to those that exist in school attendance of the Portuguese language. We are interested in, therefore, observe, discursively, as the image is created of the interlocutors to which they are intended considering that the enunciators are not in front of those who occupy the place of real students, because they are virtual students. We, too, to know as the gender class manifested itself in those sites, as these sites dialogue with the face-to-face class in relation to ideology, the function of the teacher, the conception of language and writing. The constitution of the corpus was from search tools on the internet. The sites that we analyzed were: alunosonline.com.br, brasilescola.com.br, coladaweb.com.br, guiadoestudante.com.br, infoescola.com.br, mundoeducação.com.br, mundovestibular.com.br, português.com.br, professorjuscelino.com.br and redaçãodissertativa.com.br. The selection was qualitative, considering the...

Caminhos de uma rede: o percurso do usuário de álcool e outras drogas

Pós-graduação em Psicologia - FCLAS

Alocação ótima de equipamentos SVC e TCSC na rede de transmissão de energia elétrica

Pós-graduação em Engenharia Elétrica - FEIS