CLC/TS 50654-1:2020

HVDC Grid Systems and connected Converter Stations - Guideline and Parameter Lists for Functional Specifications - Part 1: Guidelines

1.1 General These Guidelines and Parameter Lists to Functional Specifications describe specific functional requirements for HVDC Grid Systems. The terminology "HVDC Grid Systems" is used here describing HVDC systems for power transmission having more than two converter stations connected to a common DC circuit. While this document focuses on requirements, that are specific for HVDC Grid Systems, some requirements are considered applicable to all HVDC systems in general, i.e. including point-to-point HVDC systems. Existing IEC, Cigré or other documents relevant 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. 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 case of converters or switchgear. Both parts have the same outline and headlines to aid the reader. 1.2 About the Present Release The present release of the Guidelines and Parameter Lists for Functional Specifications describes technical guidelines and specifications for HVDC Grid Systems which are characterized by having exactly one single connection between two converter stations, often referred to as radial systems. When developing the requirements for radial systems, care is taken not to build up potential showstoppers for meshed systems. Meshed HVDC Grid Systems can be included into this specification at a later point in time. The Guidelines and Parameter List to the Functional Specification of HVDC Grid Systems cover technical aspects of: - coordination of HVDC grid and AC systems - HVDC Grid System characteristics - HVDC Grid System control - HVDC Grid System protection - AC/DC converter stations - HVDC Grid System installations, including DC switching stations - models and validation - HVDC Grid System integration tests Beyond the present scope, the following content is proposed for future work: - transmission lines and transition stations - DC/DC converter stations - DC line power flow controllers

Hochspannungsgleichstrom-Netzsysteme - Leitfaden und Parameter-Listen für funktionale Spezifikationen - Teil 1: Leitfaden

Réseaux CCHT et stations de conversion connectées - Lignes directrices et listes de paramètres pour les spécifications fonctionnelles - Partie 1: Lignes directrices

Sistemi visokonapetostnega enosmernega omrežja in priključene pretvorniške postaje - Smernice in seznam parametrov za funkcijsko specifikacijo - 1. del: Smernice

General Information

• Status: Published
• Publication Date: 18-Jun-2020
• ICS: 29.240.01 - Power transmission and distribution networks in general
• Technical Committee: CLC/TC 8X - System aspects of electrical energy supply
• Drafting Committee: CLC/TC 8X/WG 06 - System aspects for HVDC grid
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 19-Jun-2020
• Due Date: 07-Mar-2021
• Completion Date: 19-Jun-2020
• Ref Project: SIST-TS CLC/TS 50654-1:2020 - HVDC Grid Systems and connected Converter Stations - Guideline and Parameter Lists for Functional Specifications - Part 1: Guidelines

Relations

• Replaces: CLC/TS 50654-1:2018 - HVDC Grid Systems and connected Converter Stations - Guideline and Parameter Lists for Functional Specifications - Part 1: Guidelines
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2020
Nadomešča:
SIST-TS CLC/TS 50654-1:2018
Sistemi visokonapetostnega enosmernega omrežja in priključene pretvorniške
postaje - Smernice in seznam parametrov za funkcijsko specifikacijo - 1. del:
Smernice
HVDC Grid Systems and connected Converter Stations - Guideline and Parameter Lists
for Functional Specifications - Part 1: Guidelines
Hochspannungsgleichstrom-Netzsysteme - Leitfaden und Parameter-Listen für
funktionale Spezifikationen - Teil 1: Leitfaden
Réseaux CCHT et stations de conversion connectées - Lignes directrices et listes de
paramètres pour les spécifications fonctionnelles - Partie 1: Lignes directrices
Ta slovenski standard je istoveten z: CLC/TS 50654-1:2020
ICS:
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/TS 50654-1

SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
June 2020
ICS 29.240.01 Supersedes CLC/TS 50654-1:2018
English Version
HVDC Grid Systems and connected Converter Stations -
Guideline and Parameter Lists for Functional Specifications -
Part 1: Guidelines
Réseaux CCHT et stations de conversion connectées - Hochspannungsgleichstrom-Netzsysteme - Leitfaden und
Lignes directrices et listes de paramètres pour les Parameter-Listen für funktionale Spezifikationen - Teil 1:
spécifications fonctionnelles - Partie 1: Lignes directrices Leitfaden
This Technical Specification was approved by CENELEC on 2020-04-13.

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,
Turkey 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
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. CLC/TS 50654-1:2020 E

Contents Page
European foreword . 6
Introduction . 7
1 Scope . 8
1.1 General . 8
1.2 About the Present Release . 8
2 Normative references . 9
3 Terms, definitions and abbreviations . 10
3.1 Terms and definitions . 10
3.2 Abbreviations . 12
4 Coordination of HVDC Grid System and AC Systems . 13
4.1 General . 13
4.2 Purpose of the HVDC Grid System and Power Network Diagram . 13
4.3 AC/DC Power Flow Optimisation . 14
4.4 Converter Operational Functions . 15
4.4.1 General . 15
4.4.2 Basic Operation Functions – Converter Normal Operation State . 15
4.4.3 Basic Operation Functions – Converter Abnormal Operation State . 16
4.4.4 Ancillary Services. 18
5 HVDC Grid System Characteristics . 23
5.1 HVDC Circuit Topologies . 23
5.1.1 Availability and Reliability . 23
5.1.2 Basic Characteristics and Nomenclature . 23
5.1.3 Attributes of HVDC Grid Systems or HVDC Grid Sub-Systems . 27
5.1.4 Attributes of a Station . 28
5.2 Connection Modes . 29
5.3 Grid Operating States . 29
5.3.1 General . 29
5.3.2 Normal State . 29
5.3.3 Alert State . 29
5.3.4 Emergency State . 29
5.3.5 Blackout State . 29
5.3.6 Restoration . 30
5.4 DC Voltages . 30
5.4.1 General . 30
5.4.2 Nominal DC System Voltage . 30
5.4.3 Steady-State DC Voltage . 30
5.4.4 Temporary DC Voltage . 31
5.4.5 Neutral Bus Voltages . 32
5.5 Insulation Coordination . 33
5.6 Short-Circuit Characteristics . 33
5.6.1 Calculation of Short-Circuit Currents in HVDC Grid Systems . 33
5.6.2 Short-Circuit Current Design Requirements . 34
5.7 Steady-State Voltage and Current Distortions . 34
5.7.1 Voltage and Current Distortion Limits . 34
5.7.2 Frequency Dependent DC System Impedance . 36
5.8 DC System Restoration . 37
5.8.1 General . 37
5.8.2 Post DC Fault Recovery . 37
5.8.3 Restoration from Blackout . 37
6 HVDC Grid System Control . 37
6.1 Closed-Loop Control Functions . 37
6.1.1 General . 37
6.1.2 Core Control Functions . 38
6.1.3 Coordinating Control Functions . 38
6.2 Controller Hierarchy . 38
6.2.1 General . 38
6.2.2 Internal Converter Control . 39
6.2.3 DC Node Voltage Control . 40
6.2.4 Coordinated HVDC Grid System Control . 41
6.2.5 AC/DC Grid Control . 43
6.3 Propagation of Information . 44
6.4 Open-Loop Controls . 45
6.4.1 Coordination of Connection Modes between Stations and their PoC-DCs . 45
6.4.2 Operating Sequences for HVDC Grid System Installations . 45
6.4.3 Post DC Fault Recovery . 46
7 HVDC Grid System Protection . 47
7.1 General . 47
7.2 DC Fault Separation . 47
7.3 Protection System Related Installations and Equipment . 48
7.3.1 AC/DC Converter Station . 48
7.3.2 HVDC Grid System Topology and Equipment . 48
7.4 HVDC Grid System Protection Zones . 49
7.4.1 General . 49
7.4.2 Permanent Stop P . 51
7.4.3 Permanent Stop PQ . 53
7.4.4 Temporary Stop P . 54
7.4.5 Temporary Stop PQ . 56
7.4.6 Continued Operation . 56
7.4.7 Example of a Protection Zone Matrix . 58
7.5 DC Protection .
...