  The progressive integration of electronic converter based Renewable Energy
Sources will lead to a reduction of the system synchronous inertia that can
endanger the system frequency stability behavior, especially in the case of
isolated or poorly interconnected systems, such as the case of Iberian
Peninsula system. This work focuses on the study of the impact that the
synchronous inertia reduction can have on the Iberian system frequency
stability for different critical operation scenarios and disturbances. For this
purpose, an equivalent dynamic model of the Iberian system interconnected with
the central European network was first developed using the Matlab Simulink
graphical programming environment. The parameters of this model are identified
using a parameter estimation approach that explores the recorded behavior of
the frequency following an outage of a nuclear unit in Spain. This model was
used afterwards to perform simulations for different generation outages and
multiple operation scenarios between 2020 and 2040.
