This document contains 20 questions about load-frequency control in single-area power systems. The questions cover topics like the function of load frequency control, how real power is controlled, definitions of terms like fly ball governor, inertia constant, area control error, per unit droop, tie line bias control, and the basic role of automatic load frequency control. It also asks about control areas, tie line power deviation equations, static and dynamic responses, assumptions in dynamic response modeling, speed regulation, automatic frequency response control, block diagrams, the need for speed changers, the importance of load frequency control, and definitions of time constant and frequency deviation.

1. LOAD-FREQUENCY DYNAMICS OF SINGLE-AREA
POWER SYSTEMS
Viva Questions
1. What is the function of load frequency control?
2. How is the real power in a power system controlled/
3. What is meant by fly ball governor?
4. Define inertia constant.
5. What is area control error?
6. Define per unit droop.
7. Write the principle of tie line bias control.
8. State the basic role of ALFC.
9. What is meant by control area?
10. Write the tie line power deviation equation in terms of frequency.
11. Differentiate static and dynamic response of an ALFC loop.
12. What are the assumptions made in dynamic response of uncontrolled case?
13. Define Speed regulation.
14. What is mean by AFRC?
15. Draw a block diagram for single area load frequency control.
16. What is a need of speed changer?
17. Why load frequency control is important in operation of power systems?
18. What is ALFC?
19. Define time constant.
20. What is meant by frequency deviation?