Download GTU BE/B.Tech 2019 Winter 8th Sem New 2180909 Power System Operation And Control Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 8th Sem New 2180909 Power System Operation And Control Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? VIII (New) EXAMINATION ? WINTER 2019
Subject Code: 2180909 Date: 25/11/2019

Subject Name: Power System Operation and Control
Time: 02:30 PM TO 05:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

MARKS

Q.1 (a) State operating states with nature of control action in a power system. 03
(b) Write importance of frequency and voltage control. 04
(c) Explain operation of transmission line for no load condition. 07

Q.2 (a) Draw block diagram which shows state estimation. 03
(b) Explain how a relationship between voltage regulation and reactive power is
governed by short-circuits capacity of transmission line.
04
(c) Describe least square approximation state estimation. 07
OR
(c) Explain the effect of tap-changing transformer in voltage control of a
transmission line
07
Q.3 (a) State and Define sensitivity factors with mathematical model. 03
(b) Explain System monitoring and Contingency Analysis related to power
system security.
04
(c) Derive equation which shows relation between maximum power and line
length of power line.
07
OR
Q.3 (a) Show graphical representation of power transfer and line length. 03
(b) List a few practical aspects for describing the reactive power flow problem
resulting voltage collapse.
04
(c) Prove that the receiving end voltage is extremely sensitive to any change in
power status at the receiving end bus.
07
Q.4 (a) Classify bad data for state estimation. 03
(b) Describe steps for detection of bad data. 04
(c) Briefly discuss the concept of ?Control Area? for automatic Load Frequency
Control and hence explain two Area Load Frequency Control.
07
OR
Q.4 (a) List out different load forecasting methods. 03
(b) Discuss reflection of load forecasting in current and future trends of power
system.
04
(c) A 100 MVA, 50 Hz synchronous generator having inertia constant of the
machine as 5 kW-sec per kVA. The load suddenly increases by 50 MW. Due
to delay in governor action there is a delay of 0.6 seconds in opening of
steam valve. Find the frequency deviation.
07
Q.5 (a) Explain static and dynamic state estimation. 03
(b) Discuss international scenario related to deregulation. 04
(c) Explain power sector scenario of India. 07
OR

Q.5 (a) Differentiate Regulated power system and Deregulated power system. 03
(b) Explain importance of state estimation in power system. 04
(c) Explain deregulation of power supply and state it?s benefits 07
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