The main objectives of load frequency
control in a power system are
1. To bring the steady state error to zero after load change.
2. To maintain the net tie-line flow.
3. To maintain voltages on all buses.
4. To economize the cost of generation.
1 and 2
2 and 3
3 and 4
1, 2, 3 and 4
1, 2, 3 and 4
The main objective of
load frequency controller is to exert control of frequency and at the same time
of real power exchange via the outgoing lines i.e. tie lines.
The change in frequency
and the tie-line real power are sensed which is a measure of the change in
rotor angle 
. Voltages on all
buses are maintained by voltage compensation techniques.
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