The main objective of power system operation and control is to maintain continuous supply of power with an acceptable quality, to all the consumers in the system. The system will be in equilibrium, when there is a balance between the power demand and the power generated. As the power in AC form has real and reactive components: the real power balance; as well as the reactive power balance is to be achieved.
English
Last updated
Mon, 15-Aug-2022
The ALFC is to control the frequency deviation by maintaining the real power balance in the
system. The main functions of the ALFC are to i) to maintain the steady frequency; ii) control the
tie-line flows; and iii) distribute the load among the participating generating units. The control
(input) signals are the tie-line deviation ∆Ptie (measured from the tie line flows), and the frequency
deviation ∆f (obtained by measuring the angle deviation ∆δ). These error signals ∆f and ∆Ptie are
amplified, mixed and transformed to a real power signal, which then controls the valve position.
Depending on the valve position, the turbine (prime mover) changes its output power to establish
the real power balance.
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