K.S.R. COLLEGE OF ENGINEERING (Autonomous) TIRUCHENGODE - 637215 DEPARTMENT OF ELECTRICAL & ELECTRONICS ENGINEERING 16EE763 - High Voltage Direct Current Transmission 2 MARKS QUESTIONS AND ANSWERS Year / Semester : IV/VII Regulation : 2016 Prepared by Dr.P.Suganya
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K.S.R. COLLEGE OF ENGINEERING (Autonomous) · 4.LTT- Light hissered thyrisor 5.Mos-controlled thyristo(MCT) 4. Write the advantages and disadvantages of HVDC Transmission Advantages
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K.S.R. COLLEGE OF ENGINEERING (Autonomous)
TIRUCHENGODE - 637215
DEPARTMENT OF ELECTRICAL & ELECTRONICS ENGINEERING
16EE763 - High Voltage Direct Current Transmission
2 MARKS QUESTIONS AND ANSWERS
Year / Semester : IV/VII
Regulation : 2016
Prepared by
Dr.P.Suganya
KSRCE / QM / 7.5.1 / 40 / EEE
K.S.R COLLEGE OF ENGINEEIRNG (Autonomous), TIRUCHENGODE - 637 215
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
LESSON PLAN
IV YEAR - EEE (JUNE 2019 - NOV 2020)
Subject Code/Name: 16EE763 - High Voltage Direct Current Transmission Year / Sem: IV /VII
Regulation: R 2016 Faculty Name: Dr.P.Suganya
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TOPIC
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UNIT - I
INTRODUCTION
L01 Introduction of DC power transmission 1 BB TB1 1
L02 Comparison of AC and DC transmission 1 BB TB1 2
L03 Economics of HVDC power transmission 1 BB TB1 2
L04 Technical performance 1 BB TB1 3
L05 reliability 1 BB TB1 5
L06 Description of HVDC transmission system 1 BB TB1 8
L07 Planning for HVDC transmission 1 BB TB1 15
L08 Modern trends in HVDC transmission 1 BB TB1 18
L09 Application of DC transmission 1 BB TB1 7
Total 9
UNIT - II
ANALYSIS OF HVDC CONVERTERS
L10 Pulse number 1 BB TB1 42
L11 Choice of converter configuration 1 BB TB1 43
L12
L13 Simplified analysis of Graetz circuit 2 PPT TB1 46
L14
L15 Converter bridge characteristics 2 PPT TB1 58
L16 Analysis of a 12 pulse converters 2 PPT TB1 61
L17
L18 Detailed analysis of converters. 1 PPT TB1 65
Total 9
UNIT - III
COMPOUNDING AND REGULATIONS
L19 General 1 PPT TB2 100
L20 Required regulation 1 PPT TB2 101
L21 Inverter compounding 1 PPT TB2 103
L22 Uncompounded inverter 1 PPT TB2 106
L23 Rectifier compounding 1 PPT TB2 108
L24 Transmission characteristics with the rectifier and inverter
compounding 1 PPT TB2 110
L25 Communication link 1 PPT TB2 115
L26 Current regulation from the inverter side 1 PPT TB2 116
L27 Transformer tap changing. 1 PPT TB2 120
Total 9
UNIT - IV
HARMONICS AND FILTERS
L28 Introduction 1 BB TB1 145
L29 Generation of harmonics 1 BB TB1 145
L30 Characteristics and uncharacteristic harmonics 1 BB TB1 147
L31
L32 Design of AC filters and DC filtes 2 BB TB1 149
L33
L34 Active filters 2 BB TB1 156
L35
L36 Interference with neighbouring communication lines. 2 BB TB2 156
Total 9
UNIT - V
HVDC CABLES AND SIMULATION OF HVDC SYSTEMS
L37 Introduction of DC cables 1 BB TB1 247
L38 Basic physical phenomenon arising in DC insulation 1 BB TB1 248
L39 Practical dielectrics 1 BB TB1 249
L40 Dielectric stress consideration 1 PPT RB3 250
L41 Economics of DC cables compared with AC cables 1 BB TB2 251
L42 Introduction to system simulation 1 BB TB2 252
L43 Philosophy and tools 1 BB TB1 253
L44 HVDC system simulation 1 PPT TB1 254
L45 Modeling of HVDC systems for digital dynamic simulation 1 BB TB1 259
Total 9
BB - Black Board, LCD - Projector, OHP - Over Head Projector, TB - Text Book; RB - Reference
Book
Text Books:
1. Padiyar, K. R., HVDC Power Transmission System, Wiley Eastern Limited, New Delhi 1992.
2. Edward Wilson Kimbark, Direct Current Transmission, Vol. I, Wiley interscience, New York, London, Sydney, 1971.
Reference Books:
1. Colin Adamson and Hingorani N G, High Voltage Direct Current Power Transmission, Garraway Limited, London, 1960.
2. Arrillaga, J., High Voltage Direct Current Transmission, Peter Pregrinus, London, 1998.
3. Rakosh Das Begamudre, Extra High Voltage AC Transmission Engineering, New Age International (P) Ltd., New Delhi, 1990.
4. Robert L. Shedden, High Voltage Direct Current Transmission, Cornell University,1971.
16EE763 - HIGH VOLTAGE DIRECT CURRENT TRANSMISSION
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
PART – A (2 Marks)
UNIT 1 1NTRODUCTION (CO 1)
PART – A (2 Marks) 1. Compare AC and DC transmission.(Remembering)
DC Transmission.
It requires only two conductors as compared to three for a.c
transmission There is no skin effect in a d.c system.
A d.c line has less corona loss and reduced interference.
AC Transmission
The power can be generated at high voltages
The maintenance of a.c sub-station is easy and cheaper 2. What are the types of DC link?(Remembering)
Monopolar link
Bipolar link
Homopolar link
3. List the types of power devices for HVDC transmission.(Remembering) 1.Thyristor
2.Insulated fiats bipolar transistor
3.GTO-gate turn-off thyristor
4.LTT- Light hissered thyrisor
5.Mos-controlled thyristo(MCT)
4. Write the advantages and disadvantages of HVDC
Transmission Advantages : (Remembering) 1.Full control over power transmitted
2.The ability to enhance transient and dynamic stability in
associated AC networks
3.Fast control to limit fault current in DC lines
4.Reduced transmission lines.
5.Interconnection of systems operating at different frequencies
Disadvantages:
1.Inability to use transformer to change voltage levels
2.High cost of converter equipment
3.Generation of harmonics which requires AC and DC filters, adding to
he cost of converters station
4.Complexity of control
6. Mention the some of HVDC projects from abroad? (Remembering)
8. What is meant by an Asynchronous tie?(understanding) When two power systems are connected through DC ties, there is no need Of
coordinated control. It is called asynchronous fie. The two systems which Have
different nominal frequencies.
9. What is LASCR? How does it differ from a conventional SCR?(Remembering) Light activated thyristor, also called LASCR. It is turned on by throwing a Pulse of
light on the silicon wafer of thyristor. This is the major difference to Others.
10. What are the types of commutation?(Remembering)
11. Why circuit turn off time should be greater than the thyristor turn-off
time?(Analysing)
Circuit turn off time should be greater than the thyristor turn-off time for re liable
turn-off, otherwise the device may turn-on at an undesired instant, a process called
commutation failure.
12. What is the turn-off time for converter grade SCRs and inverter grade
SCRs? (Remembering)
Turn-off time for converter grade SCRs is 50 – 100 ms turn-off time for
converter grade SCRs and inverter grade SCRs and for inverter grade SCRs is 3
– 50 ms.
13. What is firing angle?(Remembering)
The angle at which thyristor is triggered it is defined as the angle between the
zero crossing of the input voltage and the instant the thyristor is fired.
14. Draw the circuit of Graetz circuit. (Remembering)