In parallel operation of synchronous generators, the incoming generator must have a slightly higher speed than the connected generators to avoid synchronization issues. If both generators operate at the same speed upon connection, a phase difference will occur due to differing load responses, leading to reverse current flow and potential activation of the reverse power trip. The new generator will slow down as it takes on load, while the existing generator will speed up as it experiences reduced load. This difference in speeds results in the generators being out of sync, causing operational complications. Proper synchronization is crucial for stable generator performance in a connected system.
