5.4 STEADY STATE RESPONSE
The purpose of automatic load frequency control (ALFC) is to maintain the desired output of a generator unit while controlling the frequency of the larger interconnection. The ALFC also helps to keep the net interchange of power among pool members at pre-determined values. One of the objectives of the loop is to maintain constant frequency in spite of floating loads.
Output → ∆f
Inputs → ∆PC, ∆PD
where ∆PC = Change in speed changer setting, and
∆PD = Change in load demand.
The speed changer has a fixed setting, i.e. ∆PC = 0 and the load demand changes.
This is called as free governor operation.
(i) Let us assume that the speed changer has a fixed setting ∆PC (S) = 0.
Assume that there is a small step of change of load ...
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