SIST-TS CLC IEC/TS 63291-2:2025
(Main)High voltage direct current (HVDC) grid systems and connected converter stations - Guideline and parameter lists for functional specifications - Part 2: Parameter lists
High voltage direct current (HVDC) grid systems and connected converter stations - Guideline and parameter lists for functional specifications - Part 2: Parameter lists
From this edition, the CLC TS 50654-2 is the adoption (identical) of the IEC TS 63291-2 (not covered by a parallel procedure).
This document defines aspects on planning, specification, and execution of multi-vendor HVDC grid systems also referred to as HVDC grids. The terms "HVDC grid systems" or "HVDC grids" are used in this document to describe HVDC systems for power transmission having more than two HVDC stations connected to a common DC circuit. The DC circuit can be of radial or meshed topology or a combination thereof. In this document, the term "HVDC grids" is used.
While this document focuses on requirements specific for HVDC grids, some requirements are considered applicable to all HVDC systems in general, i.e., including point-to-point HVDC systems. Existing IEC (e.g., IEC TR 63363-1 [1]), Cigre or other relevant documents have been used for reference as far as possible.
Corresponding to electric power transmission applications, this document is applicable to high voltage systems, i.e., those having typically nominal DC voltages higher than 50 kV with respect to earth are considered in this document.
NOTE While the physical principles of DC networks are basically voltage independent, the technical options for designing equipment get much wider with lower DC voltage levels, e.g. in the case of converters or switchgear.
This document covers technical aspects of:
• coordination of HVDC grid and AC systems,
• HVDC grid characteristics,
• HVDC grid control,
• HVDC grid protection,
• AC/DC converter stations,
• HVDC grid installations, including DC switching stations and HVDC transmission lines,
• studies and associated models,
• testing.
Beyond the scope of this document, the following content is proposed for future work:
• DC/DC converter stations.
Hochspannungsgleichstrom-Netzsysteme und angeschlossene Umrichterstationen - Leitfaden und Parameterlisten für funktionale Spezifikationen - Teil 2: Parameter-Listen
Réseaux en courant continu à haute tension (CCHT) et postes de conversion connectés - Lignes directrices et listes de paramètres pour les spécifications fonctionnelles - Partie 2: Listes de paramètres
Sistemi visokonapetostnega enosmernega omrežja in priključene pretvorniške postaje - Smernice in seznam parametrov za funkcijsko specifikacijo - 2. del: Seznam parametrov
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2025
Sistemi visokonapetostnega enosmernega omrežja in priključene pretvorniške
postaje - Smernice in seznam parametrov za funkcijsko specifikacijo - 2. del:
Seznam parametrov
High voltage direct current (HVDC) grid systems and connected converter stations -
Guideline and parameter lists for functional specifications - Part 2: Parameter lists
Hochspannungsgleichstrom-Netzsysteme und angeschlossene Umrichterstationen -
Leitfaden und Parameterlisten für funktionale Spezifikationen - Teil 2: Parameter-Listen
Réseaux en courant continu à haute tension (CCHT) et postes de conversion connectés
- Lignes directrices et listes de paramètres pour les spécifications fonctionnelles - Partie
2: Listes de paramètres
Ta slovenski standard je istoveten z: CLC IEC/TS 63291-2:2025
ICS:
29.200 Usmerniki. Pretvorniki. Rectifiers. Convertors.
Stabilizirano električno Stabilized power supply
napajanje
29.240.01 Omrežja za prenos in Power transmission and
distribucijo električne energije distribution networks in
na splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
TECHNICAL SPECIFICATION CLC IEC/TS 63291-2
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION September 2025
ICS 29.240.01; 29.200 Supersedes CLC/TS 50654-2:2020
English Version
High voltage direct current (HVDC) grid systems and connected
converter stations - Guideline and parameter lists for functional
specifications - Part 2: Parameter lists
(IEC/TS 63291-2:2023)
Réseaux en courant continu à haute tension (CCHT) et Hochspannungsgleichstrom-Netzsysteme und
postes de conversion connectés - Lignes directrices et angeschlossene Stromrichterstationen - Leitfaden und
listes de paramètres pour les spécifications fonctionnelles - Parameter-Listen für funktionale Spezifikationen - Teil 2:
Partie 2: Listes de paramètres Parameter-Listen
(IEC/TS 63291-2:2023) (IEC/TS 63291-2:2023)
This Technical Specification was approved by CENELEC on 2025-08-26.
CENELEC members are required to announce the existence of this TS in the same way as for an EN and to make the TS available promptly
at national level in an appropriate form. It is permissible to keep conflicting national standards in force.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. CLC IEC/TS 63291-2:2025 E
European foreword
This document (CLC IEC/TS 63291-2:2025) consists of the text of document IEC/TS 63291-2:2023,
prepared by IEC/TC 115 "High Voltage Direct Current (HVDC) transmission for DC voltages above
100 kV".
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document is read in conjunction with CLC IEC/TS 63291-1:2025.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Technical Specification IEC/TS 63291-2:2023 was approved by CENELEC
as a European Technical Specification without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60633:2019 NOTE Approved as EN IEC 60633:2019 (not modified)
IEC 61660-1:1997 NOTE Approved as EN 61660-1:1997 (not modified)
IEC 61000-4-7 NOTE Approved as EN 61000-4-7
IEC 61975:2010 NOTE Approved as EN 61975:2010 (not modified)
IEC 61975:2010/A1:2016 NOTE Approved as EN 61975:2010/A1:2017 (not modified)
IEC 60909 (series) NOTE Approved as EN 60909 (series)
IEC 62271-100 NOTE Approved as EN IEC 62271-100
IEC 62271-102 NOTE Approved as EN IEC 62271-102
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 62747 2014 Terminology for voltage-sourced converters EN 62747 2014
(VSC) for high-voltage direct current (HVDC)
systems
+ A1 2019 + A1 2019
IEC/TS 63291-1 2023 High voltage direct current (HVDC) grid CLC IEC/TS 63291-1 2025
systems and connected converter stations -
Guideline and parameter lists for functional
specifications - Part 1: Guideline
IEC TS 63291-2 ®
Edition 1.0 2023-09
TECHNICAL
SPECIFICATION
colour
inside
High voltage direct current (HVDC) grid systems and connected converter
stations – Guideline and parameter lists for functional specifications –
Part 2: Parameter lists
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.200; 29.240.01 ISBN 978-2-8322-7572-6
– 2 – IEC TS 63291-2:2023 © IEC 2023
CONTENTS
FOREWORD . 9
INTRODUCTION . 11
1 Scope . 12
2 Normative references . 12
3 Terms, definitions and abbreviated terms . 13
3.1 Terms and definitions . 13
3.2 Abbreviated terms . 17
4 Coordination of HVDC grid and AC systems . 18
4.1 About HVDC grids . 18
4.2 HVDC grid structure . 18
4.3 Purpose of the HVDC grid and power network diagram . 18
4.4 AC/DC power flow optimisation . 19
4.5 Converter operational functions . 21
4.5.1 Basic operation functions – Converter normal operation state . 21
4.5.2 Basic operation functions – Converter abnormal operation state . 22
4.5.3 Ancillary services . 24
5 HVDC grid characteristics . 28
5.1 HVDC circuit topologies . 28
5.1.1 Availability and reliability . 28
5.1.2 Basic characteristics and nomenclature . 28
5.1.3 Attributes of HVDC grids or HVDC grid subsystems . 29
5.1.4 Attributes of an HVDC station . 29
5.2 Connection modes . 30
5.3 Grid operating states . 30
5.3.1 General . 30
5.3.2 Normal state . 30
5.3.3 Alert state . 30
5.3.4 Emergency state . 30
5.3.5 Blackout state . 30
5.3.6 Restoration . 30
5.4 DC voltages . 31
5.4.1 General . 31
5.4.2 Nominal DC system voltage . 32
5.4.3 Steady-state DC pole voltage . 32
5.4.4 Temporary DC pole voltage . 32
5.4.5 DC neutral bus voltage . 33
5.5 Insulation coordination . 35
5.6 Short-circuit characteristics . 35
5.6.1 Calculation of short-circuit currents in HVDC grids . 35
5.6.2 Short-circuit current design requirements . 37
5.7 Steady-state voltage and current distortions . 37
5.7.1 Emissions and impacts . 37
5.7.2 Rights and obligations of a connectee . 39
5.7.3 Similarities between HVDC grids and AC networks . 39
5.7.4 Voltage and current distortion limits . 39
5.7.5 Allocation of limits to individual connectees . 39
IEC TS 63291-2:2023 © IEC 2023 – 3 –
5.7.6 Frequency-dependent DC system impedance . 39
5.8 DC system restoration. 39
5.8.1 General . 39
5.8.2 Post-DC fault recovery . 40
5.8.3 Restoration from blackout . 40
6 HVDC grid control . 40
6.1 Closed-loop control functions . 40
6.1.1 General . 40
6.1.2 Core control functions . 40
6.1.3 Coordinating control functions . 40
6.2 Controller hierarchy . 40
6.2.1 General . 40
6.2.2 Internal converter control . 40
6.2.3 DC node voltage control . 40
6.2.4 Coordinated HVDC grid control . 41
6.2.5 AC/DC grid control . 44
6.3 Propagation of information . 44
6.4 Open-loop controls. 48
6.4.1 Coordination of connection modes between HVDC stations and their
PoC-DC . 48
6.4.2 Operating sequences for HVDC grid installations .
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.