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IEC 62747
Edition 1.0 2014-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
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)
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IEC 62747
Edition 1.0 2014-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
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
PRICE CODE
INTERNATIONALE
CODE PRIX V
ICS 29.200; 29.240 ISBN 978-2-8322-1702-3
– 2 – IEC 62747:2014 IEC 2014
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references. 5
3 Symbols and abbreviations . 5
3.1 List of letter symbols . 5
3.2 List of subscripts . 6
3.3 List of abbreviations . 7
4 Graphical symbols . 8
5 General terms related to converter circuits . 9
6 VSC topologies . 10
7 Converter units and valves . 10
8 Converter operating conditions. 16
9 HVDC systems and substations . 20
10 HVDC substation equipment . 23
11 Modes of control . 26
12 Control systems . 27
Bibliography . . 30
Figure 1 – Converter symbol identifications . 7
Figure 2 – Graphical symbols . 8
Figure 3 – Voltage-sourced converter unit . 11
Figure 4 – Phase unit of the modular multi-level converter (MMC) in basic half-bridge,
two-level arrangement, with submodules . 13
Figure 5 – Phase unit of the cascaded two-level converter (CTL) in half-bridge form . 14
Figure 6 – Phasor diagram showing a.c. system voltage, converter a.c. voltage and
converter a.c. current . . 18
Figure 7 – Example of bipolar VSC transmission with earth return . 21
Figure 8 – VSC transmission with a symmetrical monopole illustrated with capacitive
earthing on the d.c. side . 22
Figure 9 – VSC transmission with an asymmetrical monopole with metallic return . 22
Figure 10 – VSC transmission with an asymmetrical monopole with earth return . 22
Figure 11 – Major components that may be found in a VSC substation . 25
Figure 12 – Hierarchical structure of an HVDC control system . 29
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TERMINOLOGY FOR VOLTAGE-SOURCED CONVERTERS (VSC)
FOR HIGH-VOLTAGE DIRECT CURRENT (HVDC) SYSTEMS
FOREWORD
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International Standard IEC 62747 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 standard is based on the following documents:
CDV Report on voting
22F/301/CDV 22F/317A/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
– 4 – IEC 62747:2014 IEC 2014
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under
...