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Gujarat Technological University: Instructions

This document contains an exam for a power system modeling and simulation course. The exam contains 5 questions assessing various topics related to power system modeling. Question 1 covers network matrices, deriving loop impedance matrices, and drawing tree and co-tree diagrams. Question 2 covers deriving fault current and voltage equations and algorithms for load flow analysis. Question 3 compares different load flow methods and covers DC load flow analysis and contingency analysis procedures. Question 4 covers contingency selection methods, network observability, and state estimation. Question 5 covers traveling waves, their effects, Bewley's lattice diagrams, and numerical integration techniques.

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55 views2 pages

Gujarat Technological University: Instructions

This document contains an exam for a power system modeling and simulation course. The exam contains 5 questions assessing various topics related to power system modeling. Question 1 covers network matrices, deriving loop impedance matrices, and drawing tree and co-tree diagrams. Question 2 covers deriving fault current and voltage equations and algorithms for load flow analysis. Question 3 compares different load flow methods and covers DC load flow analysis and contingency analysis procedures. Question 4 covers contingency selection methods, network observability, and state estimation. Question 5 covers traveling waves, their effects, Bewley's lattice diagrams, and numerical integration techniques.

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be6351
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Seat No.: _____ Enrolment No.

______

GUJARAT TECHNOLOGICAL UNIVERSITY


M.E Sem-I Regular Examination January / February 2011

Subject code: 710701N


Subject Name: Power System Modeling and Simulation
Date: 31 /01 /2011 Time: 02.30 pm 05.00 pm
Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1 (a) Define the following network matrix : 02


[1]Basic Cut-set matrix
[2] Branch Path incidence Matrix.
(b) Derive the following relation : Zloop = B[z] BT 05
Where Zloop = Loop impedence matrix.
B = Basic loop incidence matrix.
(c) For the network shown in the Figure 1.0, Draw the tree, co-tree and find out ZBUS 07

Q.2 (a) Derive the equation to find out fault current, fault voltage in a n-bus power 07
system with fault at the bus r with fault impedence Zr .
(b) Draw the flow chart for Fast-decoulped method for n bus power system having 07
both PV and PQ buses.
OR
(b) Explain the Algorithm for Load- flow solution only for PQ bus using N-R 07
method.

Q.3 (a) Compare the following Load flow method : 07


(1) N-R method versus G-S method
(2) Fast Decoupled method versus N-R method
(b) Explain Explain DC load flow study stating its conditions 07
OR
Q.3 (a) Draw the flow chart of contingency analysis procedure. 07
(b) Explain the following with respect to power system security 07
(1) Generation shift factor (2) Line outage distribution factor
Q.4 (a) What are various methods of contingency selection . Explain any one 07
method in detail.
(b) explain network obsevability and application of state estimation.. 07
OR
Q.4 (a) Explain the maximum likelihood concept using a suitable example. 07
(b) Explain Sparsity technique . Give any one method to store sparse matrix in 07
computer .

Q.5 (a) What is travelling wave ? How it is generated? 03


(b) Discuss the effect of travelling wave on short-circuited transmission line. 04
(c) Explain Bewleys Lattice diagram with neat sketch .What informations are 07
obtained from bewleys lattice diagram.?
OR
Q.5 (a) Explain the following numerical integration method. 07
(1) Forward Eulers method .
(2) Range-Kutta mehod.
(b) Write a short note on Step-Size selection with respect to Numerical integration 07
technique.

*************

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