Elaboração de algoritmos de fluxo de potência para redes de distribuição considerando geração distribuída

Abstract

The load flow studies are fundamental to the operation of the electric power system. It allows us to see the operational conditions of the steady state of the system. Conventional methods for calculating load flow in transmission networks, such as the Gauss-Seidel and Newton-Raphson methods, among others, may present poor performance when applied in distribution systems, specialy for radial networks with large number of bars. This work considers the development of a power flow analysis algorithm through the BFS method (Backward / Forward Sweep). In order to do so, a theoretical basis for understanding the power flow concepts and the methods used to solve them, both for transmission systems and for distribution systems, was developed during the course of the study. In this study we presented the equations of the BFS method involving the complex operator, as well as a step-by-step explanation of its solution. We also implemented an algorithm to calculate the hourly power flow based on the BFS method. Another issue addressed was the issue of distributed generation, especially eolic generation, for which an algorithm was implemented to obtain wind speed curves from historical data. Finally, we compared the results of the voltage in the 10, 33 and 69 bars systems obtained by the algorithm implemented in the software MATLAB ® with the results obtained by the resolution of the Gauss-Seidel method and the software ANAREDE ® for scenarios with and without distributed generation, and also the validation of the hourly power flow algorithm.