Previous Year Question

Correct Answer

B — Frequency and real power exchange

Concept and Reasoning

In an interconnected system, load-frequency control maintains system frequency near nominal and regulates scheduled real-power interchange over tie lines between control areas. Reactive power and bus voltage are primarily handled by excitation/voltage control. Therefore option B.

Calculation / Key Relation

ACE combines frequency deviation and tie-line real-power error

Exam Takeaway

LFC/AGC controls frequency + real-power interchange.

Common Mistake

Do not include reactive-power exchange as the main objective of load-frequency control.