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To auto synchronize an alternator with grid, consider the manual method first... 1. Adjust RPM so that frequency is slightly higher than the grid
2. Adjust excitation current so that voltage is slightly higher than the grid
3. Just before phase angle of zero is encountered, close the breaker
4. Immediately adjust input power (close steam bypass valves) and adjust excitation current to achieve desired watts and vars
5. Monitor and trim as needed So, to do this automatically, build a controller that does this. A computer, perhaps?

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