Análise de estabilidade transitória em sistemas de energia elétrica pelo critério de igualdade de áreas estendido.

Abstract

The analysis of the transient stability is an essential study to the planning and the operation of the electric power systems, consisting in the examination of the dynamic behavior of the synchronous machines after a major disturbance occurs. In the area equality criterion, the determination of the transient stability limit is obtained through purely algebraic procedures, achieving good precision results and with a calculation time well below the traditional numerical integration method, but can only be applied in case of two machines or one machine and one bus infinite. This paper presents the extension of this criterion to the case of multi-machine systems. In the Extended Area Equality Criterion - CIAE, the multi-machine system is separated into one or more potentially critical machines and the remaining machines are aggregated into one equivalent obtained using the center-of-angle concept. This two-machine equivalent system and transformed into an infinite bar-machine equivalent and then applied the equality of areas criterion. The mathematical modeling, the computational implementation, the application to the energy system of northeastern Brazil and the comparison of the results obtained with the analysis made by the traditional method are described.