Dear Enrique,
From the information in the links you provided, it looks like SAM's dish Stirling model would be appropriate for the Infinia PowerDish, but not for the IBM solar dish. The IBM system uses a dish-shaped collector to focus light on a PV cell, and generates both heat for a thermal application and electricity.
SAM's dish Stirling model is somewhat limited in that it requires parameters like a set of Beale curve-fit coefficients for the Stirling engine, which may not be readily available.
I am not aware of a different model to model these types of systems.
Best regards,
Paul.