Avaliação da estabilidade de tensão por sobrecarregamento global ou local do sistema elétrico

Abstract

Abstract: The assessment of static voltage stability is essential for the operational safety of an electrical system. Commonly, this study is conducted by simultaneously incrementing all system buses at the same rate until reaching the point of maximum loading. While this method of calculating stability limits is justified as it represents the most adverse situation possible, it doesn’t allow for the identification of the most critical buses in voltage collapse in parts of the network. In this article, the voltage stability is evaluated when the buses are overloaded one by one. For the case study in the IEEE 14-bus system, it was found through conventional loading that the most sensitive buses to the increment are buses 14 and 9, while the least sensitive bus is the bus 12. However, through individual overloading of the buses, bus 12 proved to be more critical to the increment than bus 9, presenting a lower remaining load capacity when the loading factor is applied solely to it. This reinforces the notion that sensitive buses (most affected by overloading) are different from critical buses (the most determinant of collapse).