EE2401 Power System Operation and Control question bank seventh semester
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EE2401 Power System Operation and Control question bank seventh semester
PART A
1.
What is the objective of power system control?
2.
What is the objective of power system operation and
control?
3.
What is load curve?
4.
What is daily, Weekly, Annual load curve?
5.
What is load duration curve?
6.
Define load factor.
7.
Define diversity factor.
8.
Define spinning reserve.
9.
Define Cold reserve.
10. Define
hot reserve.
12. Define
demand factor.
13. What
is plant use factor?
PART B
1. A
generating station has the
following daily load cycle:
Time (hours)
|
0-6
|
6-10
|
10-12
|
12-16
|
16-20
|
20-24
|
Load(MW)
|
20
|
25
|
30
|
25
|
35
|
20
|
Draw the Load curve (1)and load duration
curve(1) and find
i.
Maximum
demand(2)
ii.
Units
generated per day(2)
iii.
Average
Load(2)
iv.
Load
Factor.(2)
2. Consider an inductive Load of type Z=R+jX
i.
By
how many percent will the real load drop if the voltage is reduced by 5
percent?(8)
ii.
How
would a 2 percent drop in frequency affects the real load, if the load is
assumed to have a power factor of 0.8.(8)
3. A Power station has to meet the following
demand.
Group
A: 200kW between 8 A.M and 6 P.M
Group
B: 100kW between 6 A.M and 10 A.M
Group
C: 50kW between 6 A.M and 10 A.M
Group
D: 100kW between 10 A.M and 6 P.M and 6
P.M and 6 A.M
Plot the daily load cure and load duration curve and
determine
(i) Diversity factor
(ii) Units generated per day
(iii) Load
factor.
UNIT II-REAL POWER -
FREQUENCY CONTROL
Fundamentals of speed governing mechanism and
modeling: Speed-load characteristics – Load sharing between two synchronous
machines in parallel; concept of control area, LFC control
of a single-area system: Static and dynamic analysis of uncontrolled and
controlled cases, Economic Dispatch Control. Multi-area systems: Two-area
system modeling; static analysis, uncontrolled case; tie line with frequency
bias control of two-area system derivation, state variable model.
PART A
1. What
is the necessity for frequency constancy in a power system? (M/J 2006)
2. What
is the need for frequency regulation? (M/J 2006)
3. What
is the need for voltage regulation in power system? (M/J 2006)
4. What
happens to frequency if the load on the generator increases? (M/J 2006)
5. What
is meant by AFRC? (M/J 2006)
6. State
the difference between P-f and Q-lVl.(N/D 2006)
7. Define
area control error.(M/J 2006)
8. Give
the two control loops of large generators. (A/M 2005)
9. What
is the basic role of ALFC?(N/D 2004)(N/D 2006)
10. What is
meant by control area? (N/D 2004)(N/D 2005)
11. Specify the
disadvantage of ALFC loop.(A/M 2005)
12. Write the
tie line power deviation equation in terms of frequency?(N/D 2005)
13. List the
advantage of multi area operation. (M/J 2007)
PART B
1. Using
a simplified functional diagram
explain the operating features of a speed governing
system.(8) (M/J 2006)
2. Develop a linear mathematical model of a
speed governing system.(8) (M/J 2006)
3. Explain the static and dynamic response
of ALFC control loop.(8)(N/D 2004)
4. Explain the technique involved in load frequency
control (LFC)of a single area
system.(8) (M/J 2006)
5. Explain the principle, involved in tie
line frequency control in case of two area system.
(M/J
2006)
6. Develop a linear mathematical model of
two area system.(8)(N/D 2004)
7. Explain the tie line bias control of two
area system .(8)(N/D 2004)
8. Briefly discuss the LFC control of single
area systems.(16)(N/D 2005)
9. Explain the dynamic response of two area
system.(8) (N/D 2005)
10. Develop a linear mathematical model of
two area system.(6)
11. Explain the tie line bias control of two
area system.(6)
12. Describe the expression for Critical gain
(4)
13. A single area controlled system has the
following data(8)
Area capacity =2000MW
Operating Load=1000MW
R=2.4Hz/p.u.MW
Find
KI and find the nature of roots for KI=1.
14. Determine the primary ALFC loop parameter
for a control area having the following
data :
Total rated area capacity,
Pr =2000MW
Normal Operating Load, Pd=1000MW
Inertia constant, H= 5 sec
R=2.4Hz/p.u. MW (all area
generators)
We
shall assume that the load frequency dependency as linear meaning that the old
load would increase 1% for 1% frequency increases.
15. A single area controlled system has the
following data(8)
Area capacity =3000MW
Operating Load=1500MW
R=3%
H=5 sec and frequency=50 Hz
Compute
steady state drop in frequency in Hz for a step load changing of 25MW
16. Two 50 Hz power station are connected by
means of an interconnected cable of negligible
impedance so that the station are in parallel.
Station A has a full load capacity of 15 MW and uniform speed regulation of 3%,
Station B has a capacity of 4MW and a uniform speed regulation of 4%. The load
on the bus bar of station A is 10MW and B is 4MW. Calculate the generated
output of each station. The power transmitted by the interconnected and the
operating frequency .Assume frequency governor action and the speed changer of
generator were set to have a frequency of 50 Hz
EEE ENGINEERING NOTES
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