New formulations for the reconfiguration problem in energy distribution systems. / Novas formulações para o problema de reconfiguração de redes de distribuição de energia elétrica.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The reconfiguration of electricity distribution systems is concerned with finding the state of switching and protective devices so as to optimize a given objective function, which is usually defined as minimization of total loss, fault isolation, load balancing among feeders, or improvement of voltage profile. In this work, the objective function is defined as the minimization of total active loss. The main difficulties associated with this problem arise from the high number of binary variables that represent the switching and protective devices, as well as the quadratic relationship between electric loss and currents flowing through the network branches. This work develops some new formulations for the distribution system reconfiguration problem, which are then solved through mixed-integer nonlinear programming. In addition, it is shown that the continuous part in all formulations is convex, which guarantees the uniqueness of the optimal solution for a given switch profile. This property allows using the Standard Newton Method for solving the continuous part of the problem, with the following advantages: impossibility of the Newton Method identifying a local minimum instead of the desired global minimum, and convergence in just one iteration owing to the quadratic nature of all formulations. The proposed formulations were implemented as computational programs and their performance was evaluated through various study cases.

ASSUNTO(S)

power distribution redes de distribuição de energia elétrica loss minimization system reconfiguration

ACESSO AO ARTIGO

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