JN
Code No: D4303 R09
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
M. Tech II Semester Examinations, January - 2018
TU
FLEXIBLE AC TRANSMISSION SYSTEMS
(Power Electronics)
Time: 3hours Max.Marks:60
Answer any five questions
H
All questions carry equal marks
---
U
1.a) Explain in detail various factors limiting the transmission line loading capability.
b) Explain, with the help of neat circuit diagram, basic types of FACTS controllers and
SE
identify the basic controllable parameter and its importance for each of the controller.
[6+6]
2.a) Explain in detail working principle of three-phase full wave bridge converter operation
D
with neat wave forms.
b) With the help of neat circuit diagram explain the transformer connections for 12 pulse
operation of bridge converter. [6+6]
PA
3.a) Explain various means employed in practice for mitigating the harmonics in bridge
convertor operation.
b) Compare current source converters with voltage source converters. [6+6]
PE
4.a) Briefly explain the objectives of shunt compensation.
b) Show that mid-point shunt compensation doubles the power transfer capability of the
line. [6+6]
R
5. Explain, with the help of neat circuit diagram, variable impedance type static var
generators. Draw VI characteristics of each of them. Also give the strategies employed
to reduce harmonics. [12]
12
6.a) Explain the concept of regulating slope in compensating devices. Discuss about the
control logic to implement it.
-
b) Explain the basic construction, principle of operation and VI characteristics of
01
STATCOM. [6+6]
7.a) Explain the concept of series compensation and list out its basic objectives.
b) Explain, with a neat sketch and waveforms, the GCSC type of series controller.
-1
[6+6]
8
8.a) Explain the basic principle and different modes of operation in TCSC.
b) Analyse the capability of TCSC in damping the oscillations and improving transient
stability of power system. [6+6]
---ooOoo---
