Overload alleviation by topology modifications

This paper presents a methodology for fast selection of bus-bar configurations through switching actions that relieves system overloads. A new power flow model that widens the traditional bus-branch model to bus section-switching device model is also proposed. This approach considers switching elements, for instance, switches and circuit breakers, and allows the search for bus-bar configurations that increase robustness of the system against contingencies, or provide procedures for alleviating overloads in system, when it is in alert or emergency state. The method was tested on a modified IEEE test system and also on part of Brazilian South-Southeastern system. The algorithm is also coupled with a security constrained optimal power flow as a filter for correctable contingencies.