Contribuições para o fluxo de carga em microrredes em operação isolada

Abstract

The Load Flow is an iterative technique that determines the static operating point of an electrical power network, that is, the complex voltages in all its buses. Load Flow is a tool that also allows knowing the power flows through all elements of an electrical network, as well as its electrical losses. Therefore, it is an essential tool for stability studies, planning, expansion and operation of any electrical system. In general, in transmission networks, distribution networks or even in microgrids that operate connected to a main grid, this calculation can be done through conventional methods, such as the Newton-Raphson method and the methods known as decoupled. However, in the particular case of microgrids in isolated operation, the application of these conventional methods has limitations, since this type of network presents a series of particular characteristics that cannot be modeled in conventional Load Flow approaches, such as the absence of a slack bus and the presence of significant fluctuations in electrical frequency. This dissertation presents an alternative strategy to solve the Load Flow of isolated microgrids, with low computational cost, based on the application of the classic fast decoupling theory. The proposed strategy was applied in two test systems, a 6-bus and a 38-bus microgrid, with multiple distributed generations and load types. The results obtained in the tests performed, demonstrated its feasibility and accuracy, thus validating the proposed methodology.