If turbine and generator inertial masses and shaft torsional effects are required for your study, the Synchronous Machine can be easily interfaced with the Multi-Mass Torsional Shaft component as illustrated below:
The multi-mass component is configured for use with the induction machine (For Use With... input parameter set to Sync_Machine), and the machine component is set to enable the multi-mass interface (Multimass Interface input parameter set to ENABLE).
Here, the machine is automatically operated in speed control mode supplying the multi-mass component with a calculated electrical torque Te and an mechanical torque signal Tm. The speed control signal w is then generated by the multi-mass component, for input into the machine.
If you want to control the speed of the machine directly, you may enable the multi-mass interface and connect your speed signal directly to the w input signal.