Abstract
This paper analyzes the impact of active overexcitation limiters (OELs) on the dynamic security assessment of power systems, with focus on transient stability. The analysis is concentrated on dynamic security regions evaluation, considering different OELs types, including the takeover and summed ones. Initially, the importance of the OEL modelling is exemplified in a study carried out on the Brazilian Interconnected Power System, where the OEL activation results in a significant transfer capability limitation. After that, the work explores the development of dynamic security regions in the IEEE New England system, showing how these regions can be distorted depending on the OELs representation.
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