Seat No.: Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-VIII EXAMINATION — SUMMER 2020Subject Code: 2180909 Date: 28/10/2020
Subject Name: Power System Operation and Control
Time:02.30 pm to 05.00 pm Total Marks: 70
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
Q.1 (a) List main components of Automatic voltage control scheme. 03
(b) Explain economical dispatch control for single area case. 04
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(c) What is power system security? Explain Power system security levels in Detail. 07
Q.2 (a) What do you mean by state estimation? 03
(b) List out the reasons which motivate to restructure the power system. 04
(c) Two generators rated 200MW and 400 MW are operating in parallel. The droop 07
characteristics of their governors are 4% and 5%, respectively from no load to
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full load. Assuming that the generators are operating at 50 Hz at no load, howwould a load of 600MW be shared between them? What will be the system
frequency at this load? Assume free governor operation.
OR
(c) Explain Basic Solution of Least Square Estimation. 07
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Q.3 (a) Obtain necessary relation between maximum power and line length. 03
(b) Explain function of different entities in deregulated power system. 04
(c) What is bad data in state estimation? How bad data are detected and suppressed in 07
state estimation.
OR
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Q.3 (a) Explain Concept of Black out: 03
(b) Show and discuss profile of reactive power losses in transmission line. 04
(c) Give flow chart for contingency selection. 07
Q.4 (a) Compare static state estimation and dynamic state estimation. 03
(b) Explain significance of ‘w’ in weighted least square estimation. 04
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(c) Describe Auto-Regressive Model and Auto- regressive Moving Average Model 07
for load forecasting.
OR
Q.4 (a) Explain classification of Voltage Stability. 03
(b) Give flow chart of one scheme of fast decoupled state estimation. 04
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(c) What do you mean by deregulated power system? Discuss its advantages and 07
relative limitations to vertical integrated system.
Q.5 (a) List a few practical aspects for describing the reactive power flow problem in 03
voltage collapse
(b) Explain various applications of state estimations in power systems. 04
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(c) Enlist different types of reactive power compensation methods for heavily 07
loaded and voltage stressed power systems. Explain static VAR compensators
in detail.
OR
Q.5 (a) Draw a neat sketch of turbine speed governing system. 03
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(b) What is the role of load forecasting? How it reflects in future trends? 04
(c) Establish relationships between voltage regulation and reactive power. Explain 07
how it is governed by short-circuits capacity.
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