IEC 62747:2014/AMD1:2019
(Amendment)Amendment 1 - Terminology for voltage-sourced converters (VSC) for high-voltage direct current (HVDC) systems
Amendment 1 - Terminology for voltage-sourced converters (VSC) for high-voltage direct current (HVDC) systems
Amendement 1 - Terminologie relative aux convertisseurs de source de tension (VSC) des systèmes en courant continu à haute tension (CCHT)
General Information
- Status
- Published
- Publication Date
- 23-Jan-2019
- Drafting Committee
- MT 33 - TC 22/SC 22F/MT 33
- Current Stage
- PPUB - Publication issued
- Start Date
- 24-Jan-2019
- Completion Date
- 31-Jan-2019
Relations
- Effective Date
- 05-Sep-2023
Overview
IEC 62747:2014/AMD1:2019 is an international amendment prepared by the International Electrotechnical Commission (IEC) that updates terminology related to voltage-sourced converters (VSC) used in high-voltage direct current (HVDC) systems. This amendment clarifies, refines, and standardizes the definitions, symbols, and abbreviations essential for engineers, manufacturers, and technical experts working with VSC HVDC technology. It plays a vital role in ensuring consistent communication and understanding across the global power electronics and electrical transmission community.
The document provides updated terms for components such as VSC valves, converter arms, and operating states, along with revisions of related letter symbols and subscripts used for voltages and currents in converter systems. It also addresses HVDC system configurations like asymmetrical monopolar systems and enhances terminology for substation equipment. This amendment is based on rigorous IEC subcommittee review and maintains alignment with other IEC standards like IEC 60633.
Key Topics
Voltage-Sourced Converters (VSC) Terminology
Defines critical terms and updated definitions for VSC components such as:- VSC switch type valves: IGBT-diode pairs switched simultaneously.
- VSC controllable voltage source valves: Complete assemblies connecting AC and DC terminals.
- Converter arms: Parts connecting AC phase terminals to DC pole terminals.
Updated Letter Symbols and Subscripts
Standardizes notation for electrical quantities relevant to converters:- Voltages on converter side of interface transformers (line-to-line, line-to-earth).
- Valve terminal-to-terminal voltages and currents.
- Subscripts indicating converter side (c), valve (v), and terminal-to-terminal (tt) for clarity.
Operating Conditions
Specifies definitions for operating states like the blocked state, where all IGBTs within a VSC unit receive continuous turn-off signals.HVDC System Configurations
Clarifies terminology for systems such as asymmetrical monopolar HVDC systems, describing configurations with unbalanced DC output voltages and grounded terminals.Substation Equipment Terminology
Updates terms related to metallic and earth return transfer devices:- Changes "metallic return transfer breaker" to "metallic return transfer switch".
- Changes "earth return transfer breaker" to "earth return transfer switch".
- References IEC 60633 for further equipment component details.
Bibliographic Updates
Replaces and removes several references to semiconductor device standards and introduces updated references relevant to power losses in VSC valves:- IEC 62751-1 and IEC 62751-2 for VSC valve power losses become primary referenced documents.
Applications
IEC 62747:2014/AMD1:2019 serves as a foundational reference standard for professionals involved in:
Design and Manufacturing
Engineers designing voltage-sourced converters and related HVDC equipment can leverage the standardized terminology to enhance design clarity, interoperability, and compliance.Power Transmission and Distribution
Utility operators and system planners rely on consistent definitions for control, protection, and monitoring of VSC HVDC systems, improving safety and operational efficiency.Technical Documentation and Training
Standardized terminology facilitates creation of technical manuals, educational materials, and training programs to ensure uniform understanding across multinational teams.Regulatory and Compliance Frameworks
Regulatory bodies and certification organizations utilize IEC standard terms to define performance, safety, and installation criteria for VSC HVDC components.
This standard amendment underpins reliable communication and development in the expanding global market for HVDC power electronics, essential to modern electricity grids integrating renewable energy sources and long-distance power transmission.
Related Standards
To enhance comprehensive knowledge and application of IEC 62747:2014/AMD1:2019, consider the following complementary IEC standards:
IEC 60633: Terminology for high-voltage direct current (HVDC) transmission
Provides specialized HVDC system terminology, complementing the VSC-focused terms in IEC 62747.IEC 62751-1: Power losses in voltage sourced converter (VSC) valves for HVDC systems – Part 1: General requirements
Details methodologies and requirements for assessing power losses in VSC valves.IEC 62751-2: Power losses in voltage sourced converter (VSC) valves for HVDC systems – Part 2: Modular multilevel converters
Covers specific aspects of power losses in modular multilevel converter valves used in HVDC systems.IEC 60747: Semiconductor devices (superseded references removed in amendment)
Earlier semiconductor terminology standards, now largely replaced or referenced selectively.
For further information and to ensure use of the latest editions, access IEC’s webstore and Electropedia online dictionary of electrotechnical terminology.
Keywords: IEC 62747 amendment, voltage-sourced converter terminology, VSC HVDC systems, high-voltage direct current, HVDC terminology, power electronics standards, IEC VSC standard, HVDC system definitions, electrical transmission standards, VSC components, HVDC converter arms, IGBT valves, HVDC substation equipment terminology.
Frequently Asked Questions
IEC 62747:2014/AMD1:2019 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Amendment 1 - Terminology for voltage-sourced converters (VSC) for high-voltage direct current (HVDC) systems". This standard covers: Amendment 1 - Terminology for voltage-sourced converters (VSC) for high-voltage direct current (HVDC) systems
Amendment 1 - Terminology for voltage-sourced converters (VSC) for high-voltage direct current (HVDC) systems
IEC 62747:2014/AMD1:2019 is classified under the following ICS (International Classification for Standards) categories: 29.200 - Rectifiers. Convertors. Stabilized power supply; 29.240.99 - Other equipment related to power transmission and distribution networks. The ICS classification helps identify the subject area and facilitates finding related standards.
IEC 62747:2014/AMD1:2019 has the following relationships with other standards: It is inter standard links to IEC 62747:2014. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
IEC 62747:2014/AMD1:2019 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
IEC 62747 ®
Edition 1.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Terminology for voltage-sourced converters (VSC) for high-voltage direct
current (HVDC) systems
Terminologie relative aux convertisseurs de source de tension (VSC) des
systèmes en courant continu à haute tension (CCHT)
IEC 62747:2014-07/AMD1:2019-01(en-fr)
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IEC 62747 ®
Edition 1.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Terminology for voltage-sourced converters (VSC) for high-voltage direct
current (HVDC) systems
Terminologie relative aux convertisseurs de source de tension (VSC) des
systèmes en courant continu à haute tension (CCHT)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.200; 29.240.99 ISBN 978-2-8322-6426-3
– 2 – IEC 62747:2014/AMD1:2019
© IEC 2019
FOREWORD
This amendment has been prepared by subcommittee 22F: Power electronics for electrical
transmission and distribution systems, of IEC technical committee 22: Power electronic
systems and equipment.
The text of this amendment is based on the following documents:
CDV Report on voting
22F/481/CDV 22F/489/RVC
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the stability date indicated on the IEC website under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_____________
2 Normative references
Add the following normative reference to the list:
IEC 60633, Terminology for high-voltage direct current (HVDC) transmission
3.1 List of letter symbols
Replace the existing first paragraph by the following new paragraph:
Essential terms and definitions necessary for the understanding of this standard are given
here; other terminology is as per relevant parts of IEC 60747, and as per IEC 60633 for
certain specialized types of equipment which are found mainly on line-commutated HVDC
schemes but may occasionally be included in VSC HVDC schemes.
Replace the existing letter symbols, and their definitions, "U ", "U ", "U " (including its note),
v ve c
"U " and "U " by the following new letter symbols and definitions:
ce valve
U line-to-line voltage on converter side of interface transformer, r.m.s. value including
c
harmonics
U line-to-earth voltage on converter side of interface transformer, r.m.s. value including
ce
harmonics
U voltage between terminals of a valve (any defined value)
vtt
© IEC 2019
Replace the existing letter symbols "I " and "I ", including their definitions, by the following
v valve
new letter symbols and definitions:
I current on converter side of interface transformer, r.m.s. value including harmonics
c
I current through a valve
ν
3.2 List of subscripts
Replace the existing subscripts "c", "v" and "valve", including their definitions, by the following
new subscripts and definitions:
c converter side of interface transformer
v through or across one valve
tt terminal to terminal
Figure 1 – Converter symbol identifications
Replace the existing Figure 1 by the following new figure:
Positive d.c. terminal
I I
v d
U
vtt
U U U
Le ce dpe
U
L
I
L I
c
U
dpp
U
c
Transformer Transformer
line side converter side
I
d
I
v
Negative d.c. terminal
IEC
3.3 List of abbreviations
Replace the existing abbreviation "NGBS" by "NBGS".
– 4 – IEC 62747:2014/AMD1:2019
© IEC 2019
5 General terms related to converter circuits
5.4
arm
converter arm
Replace the existing definition by the following new definition:
part of a converter connecting one a.c. phase terminal with one d.c. pole terminal
7 Converter units and valves
7.8
VSC valve
Replace the existing term and definition by the following new term and definition:
VSC switch type valve
a
...
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