Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 7th Sem New 2170901 Inter Connected Power System Previous Question Paper
Page 1 of 2
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2170901 Date: 26/11/2018
Subject Name: Inter Connected Power System
Time: 10:30 AM TO 01:00 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) What is the importance of interconnected power system? 03
(b) Explain Cascade Tripping. 04
(c) Discuss Zbus building algorithm. Explain all types of modifications
when transmission lines are added between the buses.
07
Q.2 (a) Give reasons: Bus admittance matrix is a sparse Matrix. 03
(b) Explain the following.
1) Bus Incidence matrix
2) Primitive network
04
(c) The fuel cost of two unit plants are given by
C1 = 100 + 2P1 + 0.005 P1
2
C2 = 200 + 2P2 + 0.01 P2
2
where P1 and P2 in MW. The plant supplies
a load of 450 MW. Find economic load scheduling of two unit and find
incremental fuel cost, neglecting losses.
07
OR
(c) A constant load of 300 MW is supplied by two 200 MW generators 1
and 2, for which the respective incremental fuel cost are
dC1/dPG1=0.1 PG1+ 20
dC2/dPG2=0.12 PG2+15
With Power PG in MW and cost C in Rs/hr. Determine
1) The most economical division of the load between the
generators and
2) The saving in Rs/day thereby obtained compared to equal
sharing between the machines.
07
Q.3 (a) Explain Properties of Y- bus matrix. 03
(b) Write a Short Note on Unit Commitment. 04
(c) State the assumptions made for load flow studies and applications of
load flow studies.
07
OR
Q.3 (a) Explain the main features of Load Dispatch centre. 03
(b) Define following :
1) Steady-state stability
2) Transient stability
04
(c) Explain GS method with the help of flowchart. 07
Q.4 (a) What is critical clearing angle? 03
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Page 1 of 2
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2170901 Date: 26/11/2018
Subject Name: Inter Connected Power System
Time: 10:30 AM TO 01:00 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) What is the importance of interconnected power system? 03
(b) Explain Cascade Tripping. 04
(c) Discuss Zbus building algorithm. Explain all types of modifications
when transmission lines are added between the buses.
07
Q.2 (a) Give reasons: Bus admittance matrix is a sparse Matrix. 03
(b) Explain the following.
1) Bus Incidence matrix
2) Primitive network
04
(c) The fuel cost of two unit plants are given by
C1 = 100 + 2P1 + 0.005 P1
2
C2 = 200 + 2P2 + 0.01 P2
2
where P1 and P2 in MW. The plant supplies
a load of 450 MW. Find economic load scheduling of two unit and find
incremental fuel cost, neglecting losses.
07
OR
(c) A constant load of 300 MW is supplied by two 200 MW generators 1
and 2, for which the respective incremental fuel cost are
dC1/dPG1=0.1 PG1+ 20
dC2/dPG2=0.12 PG2+15
With Power PG in MW and cost C in Rs/hr. Determine
1) The most economical division of the load between the
generators and
2) The saving in Rs/day thereby obtained compared to equal
sharing between the machines.
07
Q.3 (a) Explain Properties of Y- bus matrix. 03
(b) Write a Short Note on Unit Commitment. 04
(c) State the assumptions made for load flow studies and applications of
load flow studies.
07
OR
Q.3 (a) Explain the main features of Load Dispatch centre. 03
(b) Define following :
1) Steady-state stability
2) Transient stability
04
(c) Explain GS method with the help of flowchart. 07
Q.4 (a) What is critical clearing angle? 03
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(b) Explain Incremental fuel cost and penalty factor with its equation. 04
(c) State the methods of Load frequency control and explain bias tie line
frequency control.
07
OR
Q.4 (a) What is primitive network? 03
(b) Draw the block diagram of AGC. 04
(c) Describe the methods of voltage control adopted for large size power
system in detail.
07
Q.5 (a) What are the advantages of FDLF method over NR method? 03
(b) Explain Power angle curve. 04
(c) A 100 MVA, 2 pole, 60 Hz generator has a moment of inertia 50 ? 10
3
kg. m
3
. 1) What is energy stored in the rotor at rated speed? 2) What is
the corresponding angular momentum? 3) Determine the inertia
constant H.
07
OR
Q.5 (a) Classify various types of buses in power system for load flow analysis. 03
(b) Explain Equal area criteria of stability. 04
(c) Discuss in brief the methods for improving transient stability. 07
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This post was last modified on 20 February 2020