### 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?
4.      What is daily, Weekly, Annual load curve?
5.      What is load duration curve?
7.      Define diversity factor.
8.      Define spinning reserve.
9.      Define Cold reserve.
10.  Define hot reserve.
11.  Define Maximum Demand.
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
i.            Maximum demand(2)
ii.            Units generated per day(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
(i) Diversity factor
(ii) Units generated per day

UNIT II-REAL POWER - FREQUENCY CONTROL

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
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
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