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Gujarat Technological University

This document is an exam for a course on HVDC Transmission Systems. The exam contains 5 questions with 3 parts each, testing students on various topics relating to HVDC transmission. Key topics covered include: 1) Comparing AC and DC transmission in terms of economy and reliability. 2) Descriptions of selective harmonic elimination technique, HVDC link schematic diagrams, and types of HVDC systems. 3) Explanations of six pulse converters, effects of firing angle delay, and rotating reference frame theory. 4) Classifications of PWM techniques and explanations of real and reactive power control using VSC. 5) Discussions of corona effect, types of insulators, phase

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99 views1 page

Gujarat Technological University

This document is an exam for a course on HVDC Transmission Systems. The exam contains 5 questions with 3 parts each, testing students on various topics relating to HVDC transmission. Key topics covered include: 1) Comparing AC and DC transmission in terms of economy and reliability. 2) Descriptions of selective harmonic elimination technique, HVDC link schematic diagrams, and types of HVDC systems. 3) Explanations of six pulse converters, effects of firing angle delay, and rotating reference frame theory. 4) Classifications of PWM techniques and explanations of real and reactive power control using VSC. 5) Discussions of corona effect, types of insulators, phase

Uploaded by

wolf gaming
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Seat No.: ________ Enrolment No.

___________

GUJARAT TECHNOLOGICAL UNIVERSITY


BE - SEMESTER– VI (NEW) EXAMINATION – WINTER 2021
Subject Code:3160921 Date:04/12/2021
Subject Name:HVDC Transmission Systems
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Simple and non-programmable scientific calculators are allowed.

MARKS
Q.1 (a) Compare AC and DC Transmission in view of economy and 03
reliability.
(b) Describe selective harmonic elimination technique. 04
(c) Describe the schematic diagram of a HVDC link, mentioning all the 07
key elements.

Q.2 (a) Write types of HVDC systems. 03


(b) Explain six pulse converter with neat diagram. 04
(c) Explain effects of firing angle delay in line commutated converters. 07
OR
(c) Explain twelve pulse converters. 07

Q.3 (a) Classify PWM techniques. 03


(b) Explain rotating reference frame theory. 04
(c) Explain real and reactive power control using VSC. 07
OR
Q.3 (a) Explain starting and stopping of HVDC link. 03
(b) Explain principles of DC Link Control in a VSC based HVDC 04
system.
(c) Write short note on high level controllers. 07

Q.4 (a) Explain corona effect. 03


(b) Enlist different types of insulators. Explain all in short. 04
(c) Draw Phase locked loop diagram. Explain its working in detail. 07
OR
Q.4 (a) Enlist reactive power sources in HVDC system. 03
(b) Explain basic concept of power system angular control. 04
(c) Explain basic principles of synchronous and asynchronous links. 07

Q.5 (a) Write types of Multi-terminal HVDC System. 03


(b) Explain Mono-polar Operation of HVDC link. 04
(c) Write short note on DC circuit breakers. 07
OR
Q.5 (a) What is modular multilevel converter? 03
(b) Explain Parallel Operation of HVDC. 04
(c) Write notes on voltage stability problems in HVAC/DC systems. 07

*************

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