Análise de estabilidade transitória na rede eléctrica nacional: estudo de caso - divisão de transporte centro

Abstract

This report aims to analyze the transient stability of the central region transmission network. Since this analysis is based on analytical methods, the first step was to construct equations that mathematically describe the problem. Due to the nature of the equations, it is practically impossible to solve them without the help of a computer program. For this purpose, the PSS/E package was used to solve the equations and plot the resulting curves. An applied, exploratory and experimental research was used using a case study. The experiment involved a fault applied in Songo, Mavuzi and Chicamba for two load conditions, the elimination of the fault by means of automatic sequencing of distance relay operations, and the plotting of swing curves for the synchronous machines for a period of 3 seconds. The curves showed that the network is stable for faults in Songo in both load conditions, and unstable for faults in Mavuzi and Chicamba for both load conditions. From this analysis it was concluded that the central transmission network is transiently unstable.