Power System Operation and Control

COMPETITIVE EXAMINATION QUESTION

1. Consider the following statements regarding load frequency control:

    

   (IES 2004)

   1. Time constant of automatic load frequency control is about 15 seconds
   2. Integral control eliminates static frequency drop.
   3. In tie-line load bias control, the control signal for each area is proportional to change in frequency as well as charge in tie-line power.

   Which of the statements given above are correct?

   1. 1,2 and 3
   2. 1 and 2
   3. 1 and 3
   4. 2 and 3