Fluxo de carga em sistemas de transmissão e distribuição: proposta de unificação pela análise de malha.

Abstract

A load flow solution method based on the first iteration of Newton's method and mesh analysis is proposed. Initially, a model for solving radial systems is developed. For meshed systems, the links are neglected at first and the system equations are solved avoiding matrix assembling and inversion. Afterwards, the links are included as radial branches in which the power must be computed in order to impose equivalence with the original system. A set of linear equations for updating the variables is obtained by performing variable transformations. Voltage controlled buses (PV buses) are modeled as voltage drops between the PV bus and the slack bus. Aggregating this adjust to the model, the robustness was increased with respect to the unadjusted case. I f one includes only the reactive power of PV buses on the updating process the prior gain in linearity is held. Voltage control by transformer tap changing is also modeled. In this case, equations are solved apart the updating process, avoiding additional burden. The proposed method was implemented and some tests were performed with several realistic distribution systems and IEEE-14, 30 and 57 busbars test systems. The results were compared with those obtained using the FDLF method. The proposed method showed an excellent performance for distribution systems and a reasonable one for IEEE testsystems.