  The Central American Regional Interconnected Power System (SER) connects six
countries: Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica, and Panama,
it is operated by the regional system operator Ente Operador Regional (EOR).
Due to its geographical shape and layout of major transmission lines, SER has a
weakly meshed grid, where disturbances can easily propagate, challenging its
reliability. Having an accurate dynamic model is important for EOR when facing
those reliability challenges. This paper describes interconnection-level model
validation efforts for the SER and Mexico interconnected system. A detailed
equivalent model of Mexico is incorporated in the existing SER planning model
used by EOR. The resultant model is then validated using simulated dynamic
contingency analysis and real system disturbance data. A fully automated suite
of scripts is also developed and shared with EOR engineers. This work helps EOR
improve their validation routine practices, to continuously improve SER dynamic
model, and hence its reliability.
