Need for parallel operation of alternators:
1) Share the electric load on the power system.
2) Reduce the size of the standby unit (reserve unit).
3) Operate the generator units near or at their maximum efficiencies.
4) Increase the reliability of the electric power system as in case of any problem with one of the units, the remaining units can take up the load.
5) Maintain the cost of generation per unit of energy to the optimum.
Conditions for proper synchronization of alternators:
1) The terminal voltage between the corresponding lines of the two alternators must be identical in magnitude and phase.
2) The frequencies of the emfs of two alternators must be equal.
3) The phase sequence of the phases RYB of two alternators must be identical.
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