DISSERTAÇÃO DE MESTRADO - PROGRAMA DE PÓS GRADUAÇÃO EM ENGENHARIA DE ELETRICIDADE

URI Permanente para esta coleçãohttps://tedebc-teste.ufma.br/handle/tede/280

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Navegando DISSERTAÇÃO DE MESTRADO - PROGRAMA DE PÓS GRADUAÇÃO EM ENGENHARIA DE ELETRICIDADE por Autor "806.031.907-82"

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    Modelo computacional eletromagnético de um sistema de distribuição para investigação de problemas de qualidade de energia elétrica
    (Universidade Federal do Maranhão, 2018-03-09) BRAGA JUNIOR, Demerval Pinheiro; PESSANHA, José Eduardo Onoda; 806.031.907-82; http://lattes.cnpq.br/8268655137736254; SOUZA, Lindomar Jacinto de; http://lattes.cnpq.br/1695996364026949; MATOS, José Gomes de; http://lattes.cnpq.br/2748821360301364
    This research implements through the ATPDraw program a distribution network for simulation of electromagnetic phenomena, identified in this research as electromagnetic model, in order to investigate power quality problems. The network in question is real, as well as the power quality problems investigated. The development and validation of implementation were made with data obtained from field measurements, i.e. actual data. In this way, the parameters can be adjusted in order to improve the accuracy of the implemented system and the final version may be used for other applications, including for preventive measures.
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    Solução de problemas de fluxo de potencia mal condicionados através do método GMRES incluindo controladores FACTS
    (Universidade Federal do Maranhão, 2016-02-26) Montelo, Marcos Silva; PESSANHA, José Eduardo Onoda; 806.031.907-82
    In this work is investigated the performance of the GMRES Method in studies of power flow extremely loaded, ill-conditioned and including FACTS Controllers, focusing on Jacobian matrix with high numbers of conditioning and real eigenvalue close to zero, in order to consolidate the virtues of GMRES in ill-conditioned problems. From this information you can set operating scenarios that may indicate points of robustness and GMRES efficiency. Consolidating test systems (hypothetical and actual) of difficult convergence associated with extremely high loaded, is also part of research to create s cenarios close to reality, or that may occur in practice. The primary purpose of the inclusion of FACTS is to assess the impact that these devices can cause the Jacobian matrix. These characteristics are informed through eigenvalues and conditioning number. In addition, we propose an iterative solver developed in MATLAB platform for power flow studies and a detailed investigation of the influence of the reordering and the e limination of non-null elements in the quality of the preconditioner of incomplete factors. The proposed methodology was applied to hypothetical and real systems with FACTS controllers, and the results of the experiments showed the greater efficiency of the iterative solver GMRES in most simulations. It was found that the larger the size of the electrical system and the worse their numeric characteristics, the better its performance.