Analysis of Voltage Sags due to Unbalanced Faults in Distribution Systems in the Presence of AC Generators

A.P. Grilo, W. Freitas, and C.A.F. Murani (Brazil)


Distributed generation, distribution systems, synchronous generators, induction generators, voltage sags, unbalanced short-circuits.


This paper presents a preliminary analysis on the impact of ac generators on voltage sags in distribution systems cause by unbalanced short-circuits. The analysis is conducted through numerous electromagnetic transient simulations. Distributed generation systems composed by synchronous and induction machines are considered. The results show that the voltage sags in different system buses are affected due to the presence of ac generators.

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