generator - How does a wind farm prevent the fastest spinning turbine from driving the slowest one?

Just what the title says.

On a wind farm spread across several score hectares, I assume, the wind-speed wouldn't be uniform. The faster spinning turbines would probably induce more electricity than the slower ones ...

Assuming the output from the farm is ganged at some point, how is the output from the faster spinning turbines prevented from interfering with the slower ones? It wouldn't be just a matter of putting a diode, would it?

Answer

You are forgetting that each turbine is connected to the grid, which is much larger than any one turbine. Each generator on the grid runs synchronously. Unless the turbines have variable transmissions, each turbine spins at the same rate. The one with more wind will have more torque, and hence more power, at the fixed speed. As long as there is positive torque on the generator shaft, the generator will be pushing power onto the grid. Some turbines will be pushing more power than others, but since the grid is essentially a infinite sink at this level, they aren't pushing each other.