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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VIII (NEW) EXAMINATION — WINTER 2018
Subject Code: 2180909 Date: 19/11/2018
Subject Name: Power System Operation and Control
Time: 02:30 PM TO 05:00 PM Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
MARKS
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Q.1 (a) Discuss concept of black out. 03
(b) Explain classification of Voltage Stability. 04
(c) Explain meaning of deregulated power system. Discuss its advantages and limitations in relation to vertically integrated system. 07
Q.2 (a) List main components of Automatic voltage control scheme. 03
(b) Define generation shift factor and line outage distribution factor in relation to security analysis. 04
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(c) Draw and explain flow chart for contingency selection. 07OR
(c) Describe Auto-Regressive Model and Auto- regressive Moving Average Model for load forecasting. 07
Q.3 (a) List out important points of electricity act - 2003. 03
(b) Explain meaning of state estimation. 04
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(c) Draw hierarchy of Load dispatch centers in India. Also list out Locations of NLDC, Regional LDCs and that of ALDCs of Western Region 07OR
Q.3 (a) Explain concept of power system security. 03
(b) Define voltage collapse. Enlist the main factors that contribute the phenomena of voltage collapse. 04
(c) Enlist different types of reactive power compensation methods for heavily loaded and voltage stressed power systems. Explain static VAR compensators in detail. 07
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Q.4 (a) Obtain necessary relation between maximum power and line length. 03
(b) Explain role of load dispatch center in power system. 04
(c) Describe the various operating states of power systems with necessary diagrams. 07
OR
Q.4 (a) Explain speed governor dead-band and its effect on AGC. 03
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(b) Explain restoration process after black out. 04(c) Discuss in brief the application aspects of the primary and secondary automatic load frequency control loops. 07
Q.5 (a) Explain significance of ‘w’ in weighted least square estimation. 03
(b) List out different sources and sinks of reactive power in power systems. 04
(c) Explain turbine speed governing mechanism. 07
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OR
Q.5 (a) Explain least square estimation in brief. 03
(b) Explain functions of different entities in deregulated power system. 04
(c) Derive the expression for voltage regulation of a transmission line and explain its relation with reactive power. 07
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