Exam Details
| Subject | interconnected power systems | |
| Paper | ||
| Exam / Course | pddc | |
| Department | ||
| Organization | Gujarat Technological University | |
| Position | ||
| Exam Date | May, 2017 | |
| City, State | gujarat, ahmedabad |
Question Paper
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER VII- EXAMINATION SUMMER 2017
Subject Code: X70902 Date: 01/05/2017
Subject Name: Interconnected Power Systems
Time: 02.30PM to 05.00PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Symbols have their usual meanings
Q.1
Explain the process of formulation of YBUS matrix using singular transformation
Explain the concept of interconnection. State the advantages and disadvantages
interconnections.
Q.2
Derive static load flow equations (SLFE). Also state the assumptions made in
in approximate load flow and explain how SLFE's get modified due to these
assumptions.
Explain in brief, how unit commitment problem can be solved using dynamic
programming method
OR
With the help of neat diagram explain fly ball speed governing mechanism
Q.3
With the help flowchart explain GS method of load flow
Compare NR and GS method of load flow
OR
Q.3
A certain power system network has the following data
Bus code Line reactance/km Shunt susceptance/km Length(km)
1-2 j0.001 j0.0016 100
2-3 j0.001 j0.0016 200
1-3 j0.001 j0.0016 250
Compute YBUS for the network neglecting line resistance
Derive the expression for most economical operation taking transmission losses into account
Q.4
Derive transmission loss formula in terms B-coefficients
Two generators rated 200 MW and 400 MW are operating in parallel. The droop
characteristics of their governors are and from no-load to full load respectively from
no-load to full load. Assuming that the generators are operating at 50 Hz at no-load, how a
load of 600 MW would be shared between them, and what would be the system frequency?
OR
Q.4
Starting from the first principles, derive swing equation
Explain equal area criteria of stability
Q.5
Two turbo-alternators with ratings given below are interconnected via a short transmission
line
Machine 4 pole, 50 Hz, 60 MW, pf 0.80 lagging, moment of inertia 30,000 kg-m2
Machine 2 pole, 50 Hz, 80 MW, pf 0.85 lagging, moment of inertia 10,000 kg-m2
Calculate the inertia constant of the single equivalent machine on a base of 200 MVA
Explain the significance of synchronous coefficient of the machine in steady state stability
analysis
OR
Q.5
Explain numerical solution of swing equation
Discuss the methods employed to improve transient and steady state stability
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER VII- EXAMINATION SUMMER 2017
Subject Code: X70902 Date: 01/05/2017
Subject Name: Interconnected Power Systems
Time: 02.30PM to 05.00PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Symbols have their usual meanings
Q.1
Explain the process of formulation of YBUS matrix using singular transformation
Explain the concept of interconnection. State the advantages and disadvantages
interconnections.
Q.2
Derive static load flow equations (SLFE). Also state the assumptions made in
in approximate load flow and explain how SLFE's get modified due to these
assumptions.
Explain in brief, how unit commitment problem can be solved using dynamic
programming method
OR
With the help of neat diagram explain fly ball speed governing mechanism
Q.3
With the help flowchart explain GS method of load flow
Compare NR and GS method of load flow
OR
Q.3
A certain power system network has the following data
Bus code Line reactance/km Shunt susceptance/km Length(km)
1-2 j0.001 j0.0016 100
2-3 j0.001 j0.0016 200
1-3 j0.001 j0.0016 250
Compute YBUS for the network neglecting line resistance
Derive the expression for most economical operation taking transmission losses into account
Q.4
Derive transmission loss formula in terms B-coefficients
Two generators rated 200 MW and 400 MW are operating in parallel. The droop
characteristics of their governors are and from no-load to full load respectively from
no-load to full load. Assuming that the generators are operating at 50 Hz at no-load, how a
load of 600 MW would be shared between them, and what would be the system frequency?
OR
Q.4
Starting from the first principles, derive swing equation
Explain equal area criteria of stability
Q.5
Two turbo-alternators with ratings given below are interconnected via a short transmission
line
Machine 4 pole, 50 Hz, 60 MW, pf 0.80 lagging, moment of inertia 30,000 kg-m2
Machine 2 pole, 50 Hz, 80 MW, pf 0.85 lagging, moment of inertia 10,000 kg-m2
Calculate the inertia constant of the single equivalent machine on a base of 200 MVA
Explain the significance of synchronous coefficient of the machine in steady state stability
analysis
OR
Q.5
Explain numerical solution of swing equation
Discuss the methods employed to improve transient and steady state stability
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