Programa de Pós-Graduação em Engenharia Elétrica e de Computação - PPGEEC/UNICAMP
URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/9606
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Navegando Programa de Pós-Graduação em Engenharia Elétrica e de Computação - PPGEEC/UNICAMP por Assunto "Engenharia elétrica"
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Item Acesso aberto (Open Access) Contribuição para o planejamento econômico de sistemas de energias elétrica: um algoritmo para a expansão simultânea da geração e transmissão usando aproximação linear(Universidade Estadual de Campinas, 1983) BRANCO, Tadeu da Mata Medeiros; KOO, Robert Liang; http://lattes.cnpq.br/0610628446391103Contribution tho the eletric power systems economic planning: an algorithm for the simultaneos expansion of generation and transmission using linear approximation. Economic Planning of Generation and Transmission in Electrical Power Systems constitutes a Nonlinear Optimization Problem which has some complexity and must be treated in a global manner. Several iteractive methods has been proposed to solve problems of this nature but sometimes are unaceptable due time and large computer storage requirements. This complexity is enlarged if generation and transmission were simultaneously optimized. Linear programming has been considered as a promissing tool to solve these problems but due the linearization of nonlinear functions the results presents some loss of accuracy, even so, for planning purposes these results are aceptable. In this work we propose a Global Algorithm for the Economic Planning of Simultaneous Expansion of Generation and Transmission in Electrical Power Systems based on the application of a Linear Programming Method and Minimum Cost Flow Algorithm which permits discret addition of generation and circuits units to the system with minimum investment cost in each period. Losses and maximum capacity of the lines are included in the algorithm, some examples are shown and at the end we suggest some extensions to further works.Item Acesso aberto (Open Access) Método rigoroso das diferenças finitas em análise de estruturas de guias dielétricos anisotrópicos com perfil de índice de refração variável(Universidade Estadual de Campinas, 1992-07-13) SOUZA SOBRINHO, Carlos Leônidas da Silva; GIAROLA, Attilio José; http://lattes.cnpq.br/7834721061998959A rigorous, general and versatil finite-difference formulation for the analysis of the propagation characteristics in structures, having the dielectric waveguide as the basic element, is presented here. In this formulation, the finite-diff erence method is used in the numerical solution of the scalar wave equation, written in terms of the transverse components of the magnetic field. As a result, a conventional eigenvalue problem is obtained without the presence of spurious modes (present in previous formulations), due to the implicit inclusion of the divergence of the magnetic field equal to zero. The general case of biaxial anisotropic dielectrics is considered, with the refractive index profile varying arbitrarily in the waveguide cross section. Dispersion characteristics for isolated and parallel coupled dielectric waveguides are calculated. The theoretical development was then used to solve particular problems and the results agree with those available from other methods. Results were obtained for a variety of guiding wave structures, of much interest, particularly for the development of integrated optics.Item Acesso aberto (Open Access) Otimização com restrições lineares e pre-condicionamento periódico: teoria e experimentos(Universidade Estadual de Campinas, 1987-09-18) GOMES, Hermínio Simões; MARTINEZ, José Mário; http://lattes.cnpq.br/8543703316798123