  This paper is addressing the quantification and the comparison of pumped
storage power plants, PSPP, contribution to synchronous inertia and synthetic
inertia when fixed speed and variable speed motor-generators technologies are
considered, respectively. Therefore, a grid stability study was conducted by
means of 1D SIMSEN simulation for the 2 x 395 MW PSPP Frades 2 in Portugal with
both fixed speed and variable speed technologies in case of operation connected
to an infinite power network or to an islanded 4.4 GW synchronous power
network.
