Producing electricity from wind, biomass and solar sources (WBSS) is a promising alternative from a sustainability perspective. Considering that the increasing insertion of WBSS into the Brazilian National Grid is an irreversible trend, it is essential to go deeper into the debate on the resulting impacts. Will it be possible to service the growth in load using WBSS and to what extent? Which strategy should be adopted to foster the inclusion of WBSS while retaining security of supply? The main objective of this article is to discuss the problems that surround these questions under the focus of full load servicing.
The aim of this work is to propose a fast and reliable method to rank a list of contingencies ordered by severity under the voltage stability point of view. The basic steps of the method consist of computing the system's post-contingency state and computing the respective performance index. These steps must be repeted for contingencies associated to all system branches. So an ordered contingency list is built considering the performance index of each contingency as a merit factor. With this list it is possible to pick the most severe contingencies and submit them to conventional tools that allow a more complete analysis and appropriate decisions to avoid operating system in insecure conditions if one of the severe contingencies occurs.It is possible to use this method as a real time tool due to its efficiency. Little computational effort is made to get the ordered contingency list and it is possible to focus the human and computational effort on the most severe contingencies. The real time operation requires efficient decision-making procedures and this method brings up the possibility of saving time since it is no longer necessary to analize all system contingencies to find out the most severe one. It suffices to analize the top-ranked contingencies captured by the proposed method.Agradeço ao gerente de Furnas Centrais Elétricas S. A., Sr. Agenor José Henriques Giannini, pelo apoio prestado, possibilitando minha participação nas aulas necessárias ao embasamento teórico imprescindível ao desenvolvimento do trabalho.Há muitas pessoas que de uma forma ou de outra contribuíram para a consecução deste trabalho e às quais aqui presto minha homenagem. Expresso minha sincera e profunda gratidão a todas elas.Muito obrigado.
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