Autorrestauração de redes de distribuição com foco na operação da distribuição - ferramenta de auxílio à tomada de decisão

Abstract

The interruption of the power supply has been configured as one of the most serious incidents affecting power quality. The power distribution system restoration has a crucial role in the electric utilities environment, in view of the pressure experienced by the distribution system operators and the goals established by the regulatory agencies, which include even the possibility of concession loss in cases of recurrence of noncompliance with DEC and FECs goals. In this sense, the self-healing systems may be an alternative, since they perform the restoration faster and automatically, reducing the impacts caused by accidental system disturbances. This work proposes a new distribution system restoration strategy, which has as main characteristic to deal with the problem from the operators view, without simplifications that are used in most of the literature work. In this proposal, a mono-objective algorithm based on the ILS (Iterated Local Search) was used in order to restore, in real time, the maximum loads, without depending on a priori knowledge of the location of the fault. Two merit functions, (i) non-restored load and (ii) number of maneuvers, were combined in a lexicographical function, in which the goal is to minimize the percentage of non-restored loads and, in case of equalities, the merit function (ii) is used as a decisive criteria. To validate the proposed methodology, two large real systems provided by CEMIG-D were tested: one with two substations, 5 feeders, 703 buses and 132 equipment, and the other with three substations, 7 feeders, 21,633 buses and 2,808 equipment. These systems have been subjected to situations of single and multiple failures. The results obtained were as expected, being achieved with very low processing time, of the order of ten seconds, complying all the operating requirements