Análise do fluxo de potência no modelo completo de subestações de energia

Abstract

According to the constant need to analyze the charge flow of an electric power system so that it always works properly and reliably, this work address the need for power flow analysis considering the complete substation model for possible protection studies. In most load flow studies, where key system information is provided, such as voltage modulus and angle, active and reactive power generation in all system buses and also active and reactive power flows in all lines switches and circuit breakers, called switchable branches, are not represented in the modeling of the electrical network due to the mathematical difficulties in modeling the impedances present in these branches. This work presents a methodology that contemplates the concepts of representation of switchable branches in the formulation of the charge flow problem, through new state variables added in the application of the Newton-Raphson method. For the analysis of the power flow, through the ANAREDE and Matlab software, the systems - standardized test of the IEEE and system-test based on the Brazilian Electric System were used, in order to solve the power flow with conventional modeling and at the level of bus section, and it is possible to observe that in both models the active and reactive power injections of the systems respect Kirchhoff's law for currents, thus validating the applied study.