IEC 60633:2019
(Main)High-voltage direct current (HVDC) transmission - Vocabulary
High-voltage direct current (HVDC) transmission - Vocabulary
IEC 6033:2019 defines terms for high-voltage direct current (HVDC) power transmission systems and for HVDC substations using electronic power converters for the conversion from AC to DC or vice versa. This document is applicable to HVDC substations with line commutated converters, most commonly based on three-phase bridge (double way) connections (see Figure 2) in which unidirectional electronic valves, for example semiconductor valves, are used. For the thyristor valves, only the most important definitions are included in this document. A more comprehensive list of HVDC valve terminology is given in IEC 60700-2. This edition includes the following significant technical changes with respect to the previous edition:
- 40 terms and definitions have been amended and 31 new terms and definitions have been added mainly on converter units and valves, converter operating conditions, HVDC systems and substations and HVDC substation equipment;
- a new Figure 13 on capacitor commutated converter configurations has been added.
The contents of the corrigendum of February 2020 have been included in this copy.
Transport d'énergie en courant continu à haute tension (CCHT) - Vocabulaire
IEC 60633:2019 définit les termes relatifs aux systèmes de transport de puissance en courant continu à haute tension (CCHT), et aux postes CCHT utilisant des convertisseurs électroniques de puissance pour la conversion du courant alternatif en courant continu ou inversement. Le présent document est applicable aux postes CCHT avec des convertisseurs commutés par le réseau, fondés le plus souvent sur le schéma en pont triphasé (deux voies) (voir Figure 2) dans lequel des valves électroniques unidirectionnelles, comme les valves à semiconducteurs, sont utilisées. Pour les valves à thyristors, seules les définitions les plus importantes sont incluses dans le présent document. Une liste plus complète de la terminologie des valves CCHT est donnée dans l’IEC 60700-2. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- 40 termes et définitions ont été modifiés et 31 nouveaux termes et définitions ont été ajoutés principalement pour les unités de conversion et les valves, les conditions de fonctionnement du convertisseur, les systèmes et postes CCHT et les équipements des postes CCHT;
- une nouvelle Figure 13 portant sur les configurations à convertisseurs commutés a été ajoutée.
Le contenu du corrigendum de février 2020 a été pris en considération dans cet exemplaire.
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Terminology for High-voltage direct current (HVDC) transmission – Vocabulary
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The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
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IEC 60633 ®
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REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Terminology for High-voltage direct current (HVDC) transmission – Vocabulary
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.200 ISBN 978-2-8322-6878-0
– 2 – IEC 60633:2019 RLV © IEC 2019
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Symbols and abbreviated terms . 5
3.1 Letter symbols . 5
3.2 Subscripts . 6
3.3 Abbreviated terms . 6
4 Graphical symbols . 6
5 General terms related to converter circuits . 7
6 Converter units and valves . 9
7 Converter operating conditions . 13
8 HVDC systems and substations . 17
9 HVDC substation equipment . 20
10 Modes of control . 24
11 Control systems . 25
12 Control functions . 27
Bibliography . 39
Figure 1 – Graphical symbols . 29
Figure 2 – Bridge converter connection . 29
Figure 3 – Example of a converter unit . 30
Figure 4 – Commutation process at rectifier and inverter modes of operation . 31
Figure 5 – Illustrations of commutation in inverter operation . 32
Figure 6 – Typical valve voltage waveforms . 33
Figure 7 – Example of an HVDC substation . 34
Figure 8 – Example of bipolar two-terminal HVDC transmission system . 35
Figure 9 – Example of a multiterminal bipolar HVDC transmission system with parallel
connected HVDC substations . 35
Figure 10 – Example of a multiterminal HVDC transmission system with series
connected HVDC substations . 36
Figure 11 – Simplified steady-state voltage-current characteristic of a two-terminal
HVDC system . 36
Figure 12 – Hierarchical structure of an HVDC control system . 37
Figure 13 – Capacitor commutated converter configurations . 38
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TERMINOLOGY FOR HIGH-VOLTAGE DIRECT CURRENT
(HVDC) TRANSMISSION – VOCABULARY
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC
Publication(s)"). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition. A vertical bar appears in the margin wherever a change
has been made. Additions are in green text, deletions are in strikethrough red text.
– 4 – IEC 60633:2019 RLV © IEC 2019
International Standard IEC 60633 has been prepared by subcommittee 22F: Power electronics
for electrical transmission and distribution systems, of IEC technical committee 22: Power
electronic systems and equipment.
This third edition cancels and replaces the second edition published in 1998,
Amendment 1:2009 and Amendment 2:2015. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) 40 terms and definitions have been amended and 31 new terms and definitions have been
added mainly on converter units and valves, converter operating conditions, HVDC
systems and substations and HVDC substation equipment;
b) a new Figure 13 on capacitor commutated converter configurations has been added.
The text of this International Standard is based on the following documents:
CDV Report on voting
22F/480/CDV 22F/491A/RVC
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The “colour inside” logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this publication using a colour printer.
The contents of the corrigendum of February 2020 have been included in this copy.
TERMINOLOGY FOR HIGH-VOLTAGE DIRECT CURRENT
(HVDC) TRANSMISSION – VOCABULARY
1 Scope
This document defines terms for high-voltage direct current (HVDC) power transmission
systems and for HVDC substations using electronic power converters for the conversion from
AC to DC or vice versa.
This document is applicable to HVDC substations with line commutated converters, most
commonly based on three-phase bridge (double way) connections (see Figure 2) in which
unidirectional electronic valves, for example semiconductor valves, are used. For the thyristor
valves, only the most important definitions are included in this document. A more
comprehensive list of HVDC valve terminology is given in IEC 60700-2.
2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this International Standard. At the time of publication, the editions
indicated were valid. All normative documents are subject to revision, and parties to
agreements based on this International Standard are encouraged to investigate the possibility
of applying the most recent editions of the normative documents indicated below. Members of
IEC and ISO maintain registers of currently valid International Standards.
IEC 60027 (all parts), Letter symbols to be used in electrical technology
IEC 60050-551:1998, International Electrotechnical Vocabulary – Part 551: Power electronics
IEC 60146-1-1:1991, General requirements and line commutated convertors – Part 1-1:
Specifications of basic requirements
IEC 60617-5:1996, Graphical symbols for diagrams – Part 5: Semiconductors and electron
tubes
IEC 60617-6:1996, Graphical symbols for diagrams – Part 6: Production and conversion of
electrical energy
There are no normative references in this document.
3 Symbo
...
IEC 60633 ®
Edition 3.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
High-voltage direct current (HVDC) transmission – Vocabulary
Transport d'énergie en courant continu à haute tension (CCHT) – Vocabulaire
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
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IEC 60633 ®
Edition 3.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
High-voltage direct current (HVDC) transmission – Vocabulary
Transport d'énergie en courant continu à haute tension (CCHT) – Vocabulaire
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.200 ISBN 978-2-8322-6812-4
– 2 – IEC 60633:2019 © IEC 2019
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Symbols and abbreviated terms . 5
3.1 Letter symbols . 5
3.2 Subscripts . 6
3.3 Abbreviated terms . 6
4 Graphical symbols . 6
5 General terms related to converter circuits . 6
6 Converter units and valves . 9
7 Converter operating conditions . 12
8 HVDC systems and substations . 15
9 HVDC substation equipment . 19
10 Modes of control . 23
11 Control systems . 23
12 Control functions . 26
Bibliography . 37
Figure 1 – Graphical symbols . 27
Figure 2 – Bridge converter connection . 27
Figure 3 – Example of a converter unit . 28
Figure 4 – Commutation process at rectifier and inverter modes of operation . 29
Figure 5 – Illustrations of commutation in inverter operation . 30
Figure 6 – Typical valve voltage waveforms . 31
Figure 7 – Example of an HVDC substation . 32
Figure 8 – Example of bipolar two-terminal HVDC transmission system . 33
Figure 9 – Example of a multiterminal bipolar HVDC transmission system with parallel
connected HVDC substations . 33
Figure 10 – Example of a multiterminal HVDC transmission system with series
connected HVDC substations . 34
Figure 11 – Simplified steady-state voltage-current characteristic of a two-terminal
HVDC system . 34
Figure 12 – Hierarchical structure of an HVDC control system . 35
Figure 13 – Capacitor commutated converter configurations . 36
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE DIRECT CURRENT
(HVDC) TRANSMISSION – VOCABULARY
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC
Publication(s)"). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60633 has been prepared by subcommittee 22F: Power electronics
for electrical transmission and distribution systems, of IEC technical committee 22: Power
electronic systems and equipment.
This third edition cancels and replaces the second edition published in 1998,
Amendment 1:2009 and Amendment 2:2015. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) 40 terms and definitions have been amended and 31 new terms and definitions have been
added mainly on converter units and valves, converter operating conditions, HVDC
systems and substations and HVDC substation equipment;
b) a new Figure 13 on capacitor commutated converter configurations has been added.
– 4 – IEC 60633:2019 © IEC 2019
The text of this International Standard is based on the following documents:
CDV Report on voting
22F/480/CDV 22F/491A/RVC
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the doc
...
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