Most of synchronous generators are operating in parallel with other
synchronous generators to supply power to the same power system.
Obvious advantages of this arrangement are:
1.Several generators can supply a bigger load;
2.A failure of a single generator does not result in a total power loss to the load
increasing reliability of the power system;
3.Individual generators may be removed from the power system for maintenance
without shutting down the load;
4.A single generator not operating at near full load might be quite inefficient. While
having several generators in parallel, it is possible to turn off some of them when
operating the rest at near full-load condition.