Gujarat Technological UniversityWinter 2025 examination

GTU 2170901 Interconnected Power System Winter 2025 Question Paper & PDF

B.E. · Electrical Engineering · Semester 7 · Subject code 2170901
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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
List out the functions of National Load Dispatch Center.
(b)
4 marks

Explain the concept of cascade tripping and black out in large size interconnected power system.

(c)
7 marks

Derive Static Load Flow Equations. Explain different type of buses used for load flow analysis.

Q.2

14 Marks
(a)
3 marks
Explain characteristics of Y-Bus Matrix.
(b)
4 marks
State and explain assumptions used in approximate load flow solution method.
(c)
7 marks

A network is shown in figure 1(a) with the values indicating impedance per unit. Its directed graph is shown in figure 1(b). Obtain the bus incidence matrix and primitive admittance matrices for the same and hence obtain Y-Bus matrix for the network.

GTU Interconnected Power System (2170901) Winter 2025 Question 2(c) Diagram
(c)
7 marks
Explain modification of Z-bus Matrix when adding a new branch between:
aA new bus and reference node; b) A new bus and an existing bus; c) An existing bus and reference node; d) Two existing buses In each case, clearly indicate in what manner the existing Z-Bus matrix shall be modified.

Q.3

14 Marks
(a)
3 marks
Write a Short Note on Unit Commitment.
(b)
4 marks
Compare N-R method and FDLF method of Load Flow Studies.
(c)
7 marks

Derive coordination equations for optimal operation of generating units and explain the iterative steps of obtaining solution for optimal generation.

(a)
3 marks
State advantages of interconnected power systems.
(b)
4 marks
Give comparison of G-S and N-R methods of Load Flow Studies.
(c)
7 marks

Derive expression for optimal generation scheduling for multiple plants when losses are taken into account. Clearly explain steps for obtaining solution of optimal generation scheduling problem.

Q.4

14 Marks
(a)
3 marks
Explain the importance of voltage control in power system.
(b)
4 marks

Explain how frequency and voltages are controlled in interconnected power system using P-f and Q-V control loops.

(c)
7 marks

With the help of a neat diagram explain turbine speed governing system. Also derive its mathematical model.

(a)
3 marks
Explain the importance of frequency control in power system.
(b)
4 marks
Explain Tie line load bias control in an interconnected power system.
(c)
7 marks

Explain in detail, Equal Area Criterion and its application for transient stability analysis.

Q.5

14 Marks
(a)
3 marks
Differentiate between steady state and transient stability.
(b)
4 marks

Define critical clearing angle and transfer reactance and their significance in stability studies.

(c)
7 marks
Enlist and explain various methods of voltage control in interconnected power system.
(a)
3 marks

Enlist various methods for improving transient stability of an interconnected power system.

(b)
4 marks
Using dynamics of synchronous machine, derive the swing equation.
(c)
7 marks

Enlist various methods for solution of swing equation and explain the Point by Point solution of swing equation in detail.

More Interconnected Power System papers

Questions repeat across sessions. Working through two or three papers shows you which topics GTU asks most.

Summer 202670 marks · 5 questions
Summer 202570 marks · 5 questions

Other Semester 7 subjects

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About this paper

Official Gujarat Technological University (GTU) examination paper for Interconnected Power System (Winter 2025, B.E. · Electrical Engineering, Sem 7). 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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