EMC - Trabalhos de Conclusão de Curso
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Navegando EMC - Trabalhos de Conclusão de Curso por Autor "Alves, Antônio César Baleeiro"
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Item Análise modal estática aplicada ao problema de fluxo de carga em coordenada retangular para avaliação de estabilidade de tensão(Universidade Federal de Goiás, 2024-02-02) Sena, Katarina Leite de; Santos, Vinícius Morais Calixto dos; Brigatto, Gelson; Kopcak, Igor; Kopcak, Igor; Alves, Antônio César Baleeiro; Garcés Negrete, Lina PaolaA voltage instability is a phenomenon directly linked to the inability of an electrical power system to meet its demand for active power, caused by inadequate reactive power support. Traditionally, voltage stability margins are calculated through static methods based on the load flow problem. Additionally, Static Modal Analysis has been a tool foridentifying critical buses or areas regarding voltage stability. This methodology uses the representation of voltage phasors in cylindrical or polar coordinates. In contrast, this study proposes applying Static Modal Analysis to the Jacobian of Load Flow in Rectangular Coordinates, where voltage phasors are represented by their Cartesian coordinates on the real and imaginary axes. The aim was to assess whether this new approach could provide additional qualitative information for identifying critical buses regarding voltage stability, complementing traditional Static Modal Analysis. For the analysis of results, well-known transmission networks from the literature were employed, and for comparing the performance of the methods developed in this study, Static Modal Analysis in polar coordinates was adopted as a reference. The results obtained demonstrate that the method developed in this study is satisfactory, as the provided voltage stability margins are close to those of the traditional method, and the Static Modal Analysis applied to Rectangular Load Flow classified the critical buses of the tested systems correctly.Item Formulação alternativa do método de Newton-Raphson com modelo ZIP – testes e comparações(Universidade Federal de Goiás, 2019-11-28) Abranches, Guilherme Araújo; Brigatto, Gelson Antônio Andrêa; Brigatto, Gelson Antônio Andrêa; Garces Negrete, Lina Paola; Alves, Antônio César BaleeiroThe formulation of the equations of the elements related to the main diagonal of the [N] and [L] sub-matrices of the Jacobian matrix of the Newton-Raphson method considering the ZIP load model presented in the technical literature of the load flow problem does not match the mathematical development of these equations. Based on this disagreement, this paper aims to propose an alternative formulation for the equations of the main diagonal elements of the [N] and [L] sub-matrices of the Newton-Raphson method with the ZIP load model. As a way of comparing the two formulations, it is adopted as performance criterion the number of iterations taken for the solution of the charge flow problem, with performance tests performed in electrical networks known in the technical literature: the 14-bar system, in this case in a version with modified load data to verify the accuracy of the results, as well as the 30-bar and 57-bar systems.V