Verified answer

I think dip has to do with the voltage sag and recovery caused by a given step increase in the generator load.

I think trim refers to adjusting the average output voltage.

I think droop refers to the percent steady state voltage sag as the load increases from minimum to maximum. This non perfect average voltage regulation helps several paralleled generators to share load changes better.

You might search the following group of key words for more info:

"power generator' tutorial dip trim droop

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Regards,

John Popelish