Three physically identical synchronous generators are operating in parallel. They are all rated for a full load of 3 MW at 0.85 PF lagging.

- The no-load frequency of generator A is 61 Hz, and its speed droop is 3.4 percent.
- The no-load frequency of generator B is 61.5 Hz, and its speed droop is 3 percent.
- The no-load frequency of generator C is 60.5 Hz, and its speed droop is 2.6 percent.

If a total load consisting of 7 MW is being supplied by this power system, what will the system frequency be, and how will the power be shared among the three generators?

Given data: Three physically identical synchronous generators are operating in parallel. They are all rated for a full load of 3 MW at 0.85 PF lagging.

The no-load frequency of generator A is 61 Hz, and its speed droop is 3.4 percent. The no-load frequency of generator B is 61.5 Hz, and its speed droop is 3 percent. The no-load frequency of generator C is 60.5 Hz, and its speed droop is 2.6 percent.

If a total load consisting of 7 MW is being supplied by this power system, Solution: We can start by finding the per-unit power rating of each generator.

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