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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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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