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This document contains details of an examination for a Computer Methods in Power Systems course, including 8 questions covering various power system analysis topics. The questions address load flow analysis techniques like Gauss-Siedel and Newton-Raphson methods, fault analysis using sequence components and bus/fault impedance matrices, steady state and transient stability concepts like swing equations and techniques to improve stability limits. The exam is for a first semester B.Tech course with a duration of 3 hours and maximum marks of 80. Students must answer any 5 of the 8 questions provided.

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57 views1 page

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This document contains details of an examination for a Computer Methods in Power Systems course, including 8 questions covering various power system analysis topics. The questions address load flow analysis techniques like Gauss-Siedel and Newton-Raphson methods, fault analysis using sequence components and bus/fault impedance matrices, steady state and transient stability concepts like swing equations and techniques to improve stability limits. The exam is for a first semester B.Tech course with a duration of 3 hours and maximum marks of 80. Students must answer any 5 of the 8 questions provided.

Uploaded by

padmajasiva
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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com

RR

Code :RR410203
IV B.Tech I Semester(RR) Supplementary Examinations, May 2011
COMPUTER METHODS IN POWER SYSTEMS
(Electrical & Electronics Engineering)

Time: 3 hours

Max Marks: 80

Answer any FIVE questions


All questions carry equal marks

1. (a) Explain the load flow solution using G-S method with the help of a flow chart.
(b) How do you classify system variables in terms of state, input and output variables, in power flow
studies.
2. (a) Describe the Newton-Raphson method for the solution of power flow equations in power systems
deriving necessary equations.
(b) What are P-V Buses? How are they handled in the above method.
3. Carry out one iteration of load flow analysis of the given system by Fast Decoupled method as shown
in the figure1

R
E

K
N

A
R

Figure 1:

T
S

Bus No.
1
2
3

R
I
F

Type

|V|

Slack
P-V
P-Q

1.01
1.00
-

Generation p.u
P
Q
0.7
-

Load
P
1.0

p.u
Q
0.4

4. Derive the equations for fault Current , line Currents , bus Voltages when a three phase fault occurs
(which is not grounded) at a bus, using fault admittance matrix in sequence Component form.
5. Derive the expressions for fault Current at buses and lines, Voltages at the faulted and other buses,
When a three-phase-to-ground fault occurs at a bus , using fault impedance and bus impedance
matrices in sequence Component form.
6. (a) Distinguish between steady state, transient state and dynamic stability.
(b) Derive the power angle equation of a single machine connected to infinite bus.
(c) Explain the following terms
i. transfer reactance.
ii. Inertia constant.
7. (a) Discuss the general considerations and assumptions that are taken into account while studying
transient stability.
(b) Discuss the various techniques adopted to improve transient stability limit.
8. (a) Give the mathematical model for the transient stability analysis of multi machine power system.
(b) Discuss fourth-order Runge-Kutta for solving the swing equation.

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