Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 8th Sem 2180909 Power System Operation And Control Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?VIII (NEW) EXAMINATION ? WINTER 2020
Subject Code:2180909 Date:21/01/2021
Subject Name:Power System Operation and Control
Time:02:00 PM TO 04:00 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Explain the generator shift factor and line outage factor concepts of power
03
system security
(b) Discuss surge impedance and surge impedance loading.
04
(c) Discuss requirements and types of load forecasting. Also discuss auto
07
regressive and auto regressive moving average models.
Q.2 (a) Explain the load frequency control considering generation rate constraints.
03
(b) Discuss the effect of Dead-band on Automatic Generation Control.
04
(c) Two generators (A & B) are operating in parallel with system frequency of
07
50 Hz at no load. The detailed specifications are given below.
Generator-A
Capacity = 200 MW, droop characteristic of governor from no load to full
load = 4%.
Generator-B
Capacity = 400 MW, droop characteristic of governor from no load to full
load = 5%.
calculate the followings
(i) How do they share system load of 600 MW?
(ii) If both generators offer droop characteristic of governor from no load to
full load of the order of 5 %, in this case, how the system load of 600 MW
will be shared by them?
Q.3 (a) Discuss the deregulation of the power system
03
(b) Discuss the model of speed governing system
04
(c) Discuss single line contingency of power system and derive the equations
07
Q.4 (a) Discuss motivation for restructuring of power system.
03
(b) Discuss generator load model
04
(c) Discuss the power system security analysis using performance index
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criteria.
Q.5 (a) Define (i) State variables, (ii) Measurement variables, and (iii) Redundancy
03
or degree of freedom
(b) List out objectives of state estimation.
04
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(c) Using figure 1, determine the size and elements of H-matrix of least square
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estimation method used for state estimation.
Q.6 (a) Define the state estimation and discuss how does it differ from load flow
03
study?
(b) Discuss the Gaussian probability density curve.
04
(c) Discuss weighted least square estimation technique.
07
Q.7 (a) List out important points of Electricity rules- 2003.
03
(b) Explain role of reactive power for voltage collapse.
04
(c) A three-phase, 50 Hz, 200 km long, transmission line operates at 220 kV.
07
It has surge impedance of the order of 400 . Calculate surge impedance
loading of it. Analyze the following
(i) If the length of line is increased to double, what will be its effect on surge
impedance of transmission line?
(ii) If the length of line is reduced to half, in this case, what will be its effect
on surge impedance of transmission line?
(iii) Discuss the effect of surge impedance load on length of transmission
line.
Q.8 (a) Explain electrical market entities and model in brief
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(b) List out the changes in power system contributing to voltage collapse.
04
Further, explain the role of on-line tap changer in this regard.
(c) List out reactive power compensation methods for heavily loaded
07
transmission line. Discuss shunt compensation using P-V curves for
different levels of compensation
Figure 1
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This post was last modified on 04 March 2021