6.1 LOAD FREQUENCY CONTROL OF TWO-AREA SYSTEM
In single-area frequency control we could represent the frequency deviations by a single variable ∆ƒ. However, in the case of two-area frequency control, we assume each area to be individually strong, and have inter connected through a weak tie-line. This therefore leads us to the assumption that the frequency deviation in the two areas can be represented by two variables ∆ƒ1, and ∆ƒ2 respectively.
An extended power system can be divided into a number of load frequency control areas inter connected by means of tie-lines. Consider a two-area case connected by a single tie-line as shown in Fig 6.1. Power systems are inter connected for economy and continuity of power supply. For an inter connected operation, ...
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