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JNTUK Question Paper

The document is a past exam paper for the subject Power System Operation & Control. It contains 8 questions related to economic load dispatch, unit commitment, load frequency control, and reactive power compensation. Students are asked to answer any 5 of the 8 questions. The questions involve calculations related to determining optimal generation schedules, fuel costs, transmission losses, frequency response, and specifications for reactive power compensators.

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Yellaji Allipilli
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254 views2 pages

JNTUK Question Paper

The document is a past exam paper for the subject Power System Operation & Control. It contains 8 questions related to economic load dispatch, unit commitment, load frequency control, and reactive power compensation. Students are asked to answer any 5 of the 8 questions. The questions involve calculations related to determining optimal generation schedules, fuel costs, transmission losses, frequency response, and specifications for reactive power compensators.

Uploaded by

Yellaji Allipilli
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Code No: R41024 R10 Set No.

1
IV B.Tech I Semester Supplementary Examinations, October/November - 2017
POWER SYSTEM OPERATION & CONTROL
(Electrical and Electronics Engineering)
Time: 3 hours Max. Marks: 75
Answer any FIVE Questions
All Questions carry equal marks
*****

1 a) What is meant by economic load dispatch? [5]


b) Two units each of 200 MW in a thermal power plant are operating all the time
throughout the year. The maximum and minimum load on each unit is 200
MW and 50 MW respectively. The incremental fuel characteristics for the
two units are given as
dC1
= 15 + 0.08 PG1 Rs/ MWh
dPG1
dC2 / dPG2 = 13 + 0.1 PG2 Rs/ MWh
Determine the saving in fuel cost in Rs / h for the economic distribution of d
total load of 100 MW between two units of the plant. Also compared with
equal distribution of the same total load. [10]

2 a) Derive the expression for loss coefficient of two generators connected to the
loads through transmission line. State if any assumptions are considered. [7]
b) Two power plants are connected together by a transmission line and load at
plant 2 . The data for the loss equations consists of the information that
200MW transmitted from plant 1 to the load results in a Transmission loss of
20 MW. Find the optimum generation schedule considering transmission
Losses to supply a load of 204.41 MW. Assume that the incremental fuel cost
characteristics of plants are given by
dC1
= 0.025 PG1 + 14 Rs/ MWhr
dPG1
dC2
= 0.05 PG2 + 16 Rs/ MWhr
dPG 2 [8]

3 a) Obtain the hydro- thermal scheduling problem. State if any assumptions are
considered. [7]
b) A two-plant system having a steam plant near the load centre and a hydro
plant at a remote location. The load is 500MW for 16 hrs a day and 350 MW,
for 8 hrs a day.
The characteristics of the units are
2
C1 = 120 + 45 PGT + 0.075 PGT Rs./hr
w2 = 0.6 PGH + 0.00283 PGH 2
m3/sec
Loss co-efficient, B22 = 0.002 MW-1
Find the generation schedule, daily water used by hydro plant and daily
operating cost of thermal plant for j =80 Rs./ m3-hr. [8]

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Code No: R41024 R10 Set No. 1

4 a) Contrast between economic load dispatch and unit commitment. [5]


b) Illustrate why do you need unit commitment solution methods? List the
methods. [6]
c) What are the constraints considered in unit commitment? [4]

5 Develop the complete block diagram model of a single area load frequency
control system. [15]

6 Deduce the expression for static error frequency and tie line powers in two
area system with neat block diagram. [15]

7 Prove that the steady state change in frequency response is zero with
proportional plus Integral control of single area and draw its block diagram. [15]

8 a) What is the need of reactive power compensation in transmission systems? [7]


b) Explain the specifications of load compensator. [8]

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