1.After synchronising the alternator to the grid,how we r
delivering power to the grid?if the i/p increases does the
speed hence frequency increases?
2.y the power factor is changing when exitation changes?what
is the relation with p.f and flux?
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Answer Posted / ashwani malhotra
The real power is goverened by Frequency of prime mover.
The relation between real power and frequency of prime
mover is inversly proportional.So as load increase on the
grid it is shared by the genset and increased load met by
reducing the speed .Then governer throat open more to enter
more steam to maintain the frequency.
The voltage at alternator is controlled by the reactive
power flow. So increase in excitation beyond normal provide
capacitive VARs and decrease in excitation less than normal
provides the Inductive VARs required by the system.
generally the system comprises of Inductive load like
motor,transformer so alternator operate mostly in Under
Excitation state.
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