The need to synchronize an alternator with the grid exists any time a generator is brought on line, whether it's a wind turbine or one of the generators at Hoover Dam. But it's not such a huge problem as you might think, since a three-phase AC alternator is also a synchronous motor. So as long as you have power from the grid, you can motorize the alternator to bring it up to speed; it will then be in sync with the grid.
As it turns out, there are both AC and DC wind turbine generators, check the link below.
BTW, the reason generators must be synchronized BEFORE they are brought on line is that they WILL be in sync AFTER they are connected to the grid. Connecting an unsynchronized generator to the grid is going to break something; it might rip the generator right out of its mounts.
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Today's Featured Article - Repairing A Massey Harris 22 - by John Reeves. I have just given this old girl (boy?) a replacement RH rear axle. I was lucky enough to find an axle in good shape at a reasonable price - also a replacement for the right rear brake assembly which was
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