PS7005 High Voltage Direct Current Transmission M.E Question Bank : srmeaswari.ac.in
Name of the College : Easwari Engineering College
University : Anna University
Subject Code/Name : PS7005/ High Voltage Direct Current Transmission
Dept : Electrical & Electronics
Degree : M.E (POWER ELECTRONICS AND DRIVES)
Year: II
Website : srmeaswari.ac.in
Document Type : Question Bank
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/srmeaswari.ac.in/3324-HVDC%20Question%20Bank.docx
SRM Easwari Direct Current Transmission Question Paper
QUESTION BANK :
TWO MARKS :
Chapter 1
1. Define the term short circuit ratio.
Related : Easwari Engineering College Power Electronics For Renewable Energy Resources M.E Question Bank : www.pdfquestion.in/3323.html
2. Give the schematic representation of different configuration of asynchronous interconnection
3. State the main criteria to go for HVDC transmission.
4. List the types of DC links.
5. Define the two measures of overall system reliability.
6. Name the 3 possible configurations of interconnections.
7. List the types of applications for which HVDC are used.
8. List four major disadvantages of HVDC transmission.
9. Distinguish between characteristics harmonics and non-characteristic harmonics
10. Discuss filter carrier frequency.
Chapter 2
1. Draw and explain what do you understand by current margin.
2. Show that converters (rectifier and inverter) consume reactive power.
3. What is meant by commutation group.
4. Why the use of 12 pulse converter is preferable over the six pulses and increase in pulse number beyond 12 is not practical.
5. Describe the three mode of converter
6. State the assumption made in the analysis of converters
7. Define pulse number
8. Explain the principle of DC link control
9. State the reasons why feedback control of power in DC link is not desirable.
10. Define characteristics and non – characteristics harmonics in HVDC system
Chapter 3
1. What are the potential applications of MTDC systems?
2. What are the typical problems considered for study of MTDC systems?
3. What are the two basic requirements for the firing pulse generation of HVDC values?
4. What is meant by start up of DC link with long pulse firing?
5. Discuss the role of converter transformer in a HVDC link.
6. Explain “ Back to Back” and “ point to point “ HVDC links.
7. State the drawbacks of EPC scheme.
8. Name a few high level controllers used in HVDC systems.
9. What is constant –current control and constant firing angle control?
10. List the advantages of MTDC systems.
Chapter 4
1. What are the basic considerations in representation of the DC systems?
2. Define per unit system for DC quantities.
3. State the problems associated with the injection of harmonics in the system.
4. State the criteria under which the effectiveness of DC filter is judged.
5. What is the significance of power flow analysis?
6. What are the equations used for corrections to the bus voltage estimation in fast decoupled load flow method?
7. Define harmonics distortion and telephone harmonic form factor.
8. What are the effects of carrier frequency and RI noise?
9. Explain how DC power is reversed in HVDC link.
10. Draw na explain VDCL characteristics.
Chapter 5
1. Draw the physical model of HVDC simulator.
2. What are the disadvantages of dynamic simulation?
3. List the tools that employed for the simulation of dynamic systems.
4. Draw the EMTP model of a valve with mathematical relation.
5. List the advantages of HVDC system simulation.
6. What are the applications of HVDC systems simulation?
7. What are the requirements of a good simulation tool?
8. List the studies that can be carried out using simulation.
9. Discuss why ?min is maintained in inverters.
10. Explain the different modes of converter controls.
16 MARKS :
UNIT-1 :
1. Compare AC and DC transmission system based on Economic aspects, technical performance and reliability?
2. With a neat sketch discuss different types of HVDC links? And explain modern trends in DC transmission.
3. Discuss the function of various components in a converter station.
4. With a neat sketch explain the different types of DC links used in DC transmission systems.
5. What are the disadvantages of DC transmission? How are they overcome recently.
6. Describe the major components of HVDC transmission.
7. What are the modern trends in Dc transmission? Explain.
8. Compare the HVDC transmission with EHVAC transmission in the following aspects, if bulk power is transmitted over a long distance.
(i) Economics of power transmission.
(ii) Technical performance and
(iii) Reliability.
9. Explain the technological development in control and protection, for better performance and reliability of a dc transmission system.
10. Explain how the economic choice of voltage level is selected for a fixed power transfer in dc transmission system.