Gujarat Technological UniversitySummer 2025 examination

GTU 3160920 Inter Connected Power System Summer 2025 Question Paper & PDF

B.E. · Electrical Engineering · Semester 6 · Subject code 3160920
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Total
70 marks
To pass
23 marks (33%)
Duration
2.5 Hours 10:30 AM – 1:00 PM
Questions
5 with internal choice
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Q.1

14 Marks
(a)
3 marks

What is meant by interconnected power systems? Explain in brief, the advantages of interconnection

(b)
4 marks

What is cascade tripping? Which conditions can lead to cascade tripping? Also explain the concept of islanding

(c)
7 marks

What is bus admittance matrix? Why bus admittance matrix is generally sparse? Discuss the formulation of bus admittance matrix using singular transformation method

Q.2

14 Marks
(a)
3 marks
Discuss load flow problem and hence derive static load flow questions.
(b)
4 marks
Derive the criteria for most economic dispatch neglecting transmission losses
(c)
7 marks

Explain why frequency control is important in power system? Give valid reasons and explain which component of power system would be adversely affected when frequency deviates significantly from its normal value? Discuss tie line load bias method of frequency control

(c)
7 marks
Discuss the different methods of voltage control employed in power systems

Q.3

14 Marks
(a)
3 marks
How FDLF differs from NR method? Comment
(b)
4 marks

The following data for a certain power system is available Bus code Impedance Line charging Ypq 1-2 0.02 + j0.08 j0.08 1-3 0.06 + j0.24 j0.06 Find Y11 and Y12

(c)
7 marks
Derive transmission loss formula in terms of B-loss coefficients
(a)
3 marks
What is penalty factor? Under which conditions its value is equal to 1?
(b)
4 marks

Incremental fuel costs in Rs/MWhr for two units in a plant are dF1/dP1 = 0.1P1 + 20 and dF2/dP2 = 0.12P2 + 16. Determine incremental fuel cost and allocation of load between units when the load is 150 MW. Neglect losses

(c)
7 marks
With the help of flowchart, explain GS method of load flow

Q.4

14 Marks
(a)
3 marks
Define steady state, dynamic and transient stability
(b)
4 marks
Discuss equal area criteria of stability
(c)
7 marks
Discuss the dynamics of synchronous machine and hence derive the swing equation
(a)
3 marks

In a certain power system the sending and receiving end voltages are |Vs| = 1.5 pu, |Vr| = 1.0 pu and X = 1.2 pu. If operating angle δ = 300, find the electrical power transferred.

(b)
4 marks

Discuss the transient model of synchronous machine tied to an infinite bus when mechanical input is suddenly increased

(c)
7 marks
Explain in detail the factors affecting transient stability

Q.5

14 Marks
(a)
3 marks
What is acceleration factor in load flow? How it affects load flow solution?
(b)
4 marks

A 100 MVA synchronous generator operates initially at no load at 3000 rpm, 50 Hz. A 25 MW load is suddenly applied to the machine. Due to time lag in the governor system, the steam valves commence to open after 0.6 seconds. Determine the frequency of the system before the steam flow commences to increase to meet the new load. Assume H = 5 MW-sec/MVA

(c)
7 marks
Discuss numerical solution of the swing equation
(a)
3 marks

Explain what is meant by synchronizing coefficient or electrical stiffness of the machine

(b)
4 marks

For the purpose of load flow analysis, classify different types of buses in power system

(c)
7 marks
What is meant by LDC? Explain the functions carried out by LDC

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About this paper

Official Gujarat Technological University (GTU) examination paper for Inter Connected Power System (Summer 2025, B.E. · Electrical Engineering, Sem 6). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.

Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.

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