Summary
In this article, a qualitative index based on an analytical methodology for calculating a global mechanical withstand safety margin for a power transformer is developed. The safety margin is calculated using parameters describing the transformer's mechanical characteristics, as well as the electrical conditions in the power system to which it is connected. The proposed methodology would allow utility professionals to evaluate the mechanical withstand adequacy of transformers produced by different manufacturers at the time of transformer acquisition, and to monitor any changes in the mechanical withstand capability of transformers already in operation as a result of the evolution of the power system itself. Moreover, the safety margin can serve as a useful metric in defining the distributed generation (DG) hosting capacity of the grid. The practical application of the proposed analysis method is illustrated by analyzing 3 power transformers with different mechanical characteristics, and with ratings of 15 kVA, 5 MVA, and 100 MVA.
This work aims to understand and analyze how synthetic inertia influences in the Brazilian electrical system. With the increase of renewable sources, mainly with the increasing advancement in distributed generation, largely due to the increase in photovoltaic energy and also by wind power plants, both being controlled by electronic converters, the kinetic energy has decreased, thus causing instability in the system, when there is a failure of some bar, for example. For this reason, the study aims to study the synthetic inertia extracted through the blades of wind generators, analyzing the influence caused on the 14 bus system, applied to the SIN
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