I don't know about the rotational speed control on the large turbines, but something similar to an automatic transmission would seem fitting to keep the output speed to the generator constant. It would still require something to synchronize the phase to the grid.
Some of the turbines generate ac or DC and use a true sine wave inverter to convert the voltage to be grid useable and have electronic synchronization controls to match the output to the grid frequency phase.
Small versions of this can be seen in some of the portable generators that can be linked together to provide more power. Each gasoline/diesel generator has an inverter and sync control and I think they dairy chain to one of the gens.
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