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I believe a synchronous generator will stay in sync with the grid. The trick is to get it running very close to the same frequency and phase before you connect it. If you don't do that, very bad things can happen.
Synchronising is easy, you just connect a light bulb ( incandescent NOT CFL) rated at at least 2x the generator output voltage across the breaker for each phase. Then you get the generator running at the correct frequency and when the light is at it's dimmest ( it will brighten and dim as it approaches the correct phase) you close the breaker. If the generator is small compared to the line ( in most cases it is) it will be phase locked and stay that way while providing power. You are basically only connecting when the generator and line are almost in phase, the difference, if small, will not have any effect.