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Consider two identical generating units with equal (4 %) speed-droop that operate in parallel in accordance with...

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Electrical Engineering

Consider two identical generating units with equal (4 %)speed-droop that operate in parallel

in accordance with the frequency-load characteristics as shownbelow.

(a) If both units are set to operate on curve A and the totalload is equal to 100 % of the rating

of one unit, what percentage of rated kW output is each unitsupplying and what is the

frequency of the common busbar?

(b) Repeat (a) if the total load is equal to 200 % of the ratingof one unit.

(c) If one unit is set to operate on curve B (while the otherremains operating on curve A) and

the total load is equal to 100 % of the rating of one unit, whatpercentage of rated kW

output is each unit supplying and what is the frequency of thecommon busbar?

(d) Repeat (c) if the total load is equal to 150 % of the ratingof one unit? How would you

characterize operation with any further increase in totalload?.

         Frequency                      Generator Rated Load %

A        106-102                                      100

B         104-100                                       100

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