IEC 62909-2:2019

Bi-directional grid-connected power converters - Part 2: Interface of GCPC and distributed energy resources

IEC 62909-2:2019 specifies GCPC interface requirements for particular distributed energy resources, namely electric vehicle (EV), battery, and photovoltaic (PV) systems. These requirements are in addition to the general requirements given in IEC 62909-1.
This International Standard is to be used in conjunction with IEC 62909-1:2017.
The clauses of particular requirements in this document supplement or modify the corresponding clauses in IEC 62909-1:2017. Where the text of subsequent clauses indicates an "addition" to or a "replacement" of the relevant requirement, test specification or explanation of IEC 62909-1:2017, these changes are made to the relevant text of IEC 62909­1:2017. Where no change is necessary and the clause is applicable, the words "The provisions of IEC 62909-1:2017, Clause XX shall apply" are used. Additional clauses, tables, figures and notes which are not included in IEC 62909-1:2017, are numbered starting from 101.

Convertisseurs de puissance connectés aux réseaux bidirectionnels - Partie 2: Interface du GCPC avec les ressources énergétiques réparties

l'IEC 62909-2:2019 définit les exigences d'interface du GCPC pour des ressources énergétiques réparties particulières, notamment les véhicules électriques (VE), les batteries et les systèmes photovoltaïques (PV). Ces exigences viennent compléter les exigences générales fournies dans l'IEC 62909-1.
La présente Norme internationale doit être utilisée conjointement avec l'IEC 62909-1:2017.
Les articles relatifs aux exigences particulières définies dans le présent document complètent ou modifient les articles correspondants de l'IEC 62909-1:2017. Lorsque le texte des articles suivants spécifie une "addition" ou un "remplacement" concernant une exigence, une spécification d'essai ou une explication fournie dans l'IEC 62909-1:2017, ces modifications se rapportent au texte correspondant de l'IEC 62909­1:2017. Lorsqu'aucune modification n'est nécessaire et que l'article est applicable, la phrase "Les dispositions de l'IEC 62909-1:2017, Article XX doivent s'appliquer" est employée. Les paragraphes, tableaux, figures et notes qui sont ajoutés à ceux de l'IEC 62909-1:2017 sont numérotés à partir de 101.

General Information

• Status: Published
• Publication Date: 07-Mar-2019
• ICS: 29.200 - Rectifiers. Convertors. Stabilized power supply
• Technical Committee: SC 22E - Stabilized power supplies
• Drafting Committee: PT 62909-2 - TC 22/SC 22E/PT 62909-2
• Current Stage: PPUB - Publication issued
• Start Date: 08-Mar-2019
• Completion Date: 29-Mar-2019

Overview

IEC 62909-2:2019 is an international standard published by the International Electrotechnical Commission (IEC) that details the interface requirements for bi-directional grid-connected power converters (GCPC) specifically used with distributed energy resources (DER). This part of the IEC 62909 series supplements the general requirements set out in IEC 62909-1:2017, focusing on the unique needs of electric vehicle (EV) systems, battery storage systems, and photovoltaic (PV) installations. By specifying standardized interface protocols and performance criteria, IEC 62909-2 facilitates optimal integration and interoperability between GCPCs and these renewable and storage energy resources.

Key Topics

• GCPC Interface Requirements
  IEC 62909-2 sets forth the supplementary interface conditions for GCPC when connected to particular DERs such as EVs, batteries, and PV systems. These involve specific performance, protection, and communication requirements to ensure safe, reliable, and efficient operation.

• Electric Vehicle (EV) Section

  • General system and interface requirements including the EV coupler and charging cable assembly.
  • Electric shock protection and isolation strategies tailored for various system types.
  • Communication protocols and self-start capabilities to manage automated connection and disconnection processes.
  • Detailed test procedures for connection interfaces.

• Battery Storage (BS) Section

  • System configuration guidance to effectively manage DC voltage and current parameters.
  • Control port functionalities with embedded functional safety requirements to ensure operational robustness.
  • Installation and operational considerations for integrating battery systems with GCPCs.

• Photovoltaic (PV) Section

  • Emphasis on arc fault protection mechanisms critical for the safe deployment of PV systems within grid-connected environments.

• Earth Fault Detection

  • Dedicated requirements for detecting earth faults on DC ports improve overall system safety and fault diagnosis in bi-directional converters.

• Supplementing IEC 62909-1
  IEC 62909-2 modifies or adds to relevant clauses in IEC 62909-1, providing targeted specifications without redundancy. For example, where general clauses are sufficient, IEC 62909-1 provisions apply directly.

Applications

• Residential and Commercial Nanogrids
  IEC 62909-2 enables the seamless integration of EV chargers, battery energy storage, and solar PV panels within microgrid and nanogrid applications. This supports optimized energy consumption and improved energy management.

• Electric Vehicle Charging Stations
  Ensures comprehensive safety, interoperability, and communication standards for grid-connected EV charging power converters, fostering interoperability across different manufacturers and regions.

• Battery Energy Storage Systems (BESS)
  Promotes the standardized electrical interface and control functions necessary for integrating battery systems with grid-connected converters, optimizing energy storage and dispatch.

• Photovoltaic Power Systems
  Supports safe and efficient PV system interfaces including arc fault detection technologies essential for compliance and operational security.

• Grid Integration and Renewable Energy Targets
  By providing clear interface standards, IEC 62909-2 facilitates the broader adoption of distributed renewable energy resources in grids, helping utilities and grid operators manage distributed generation sources effectively.

Related Standards

• IEC 62909-1:2017
  The foundational part of the series defining general GCPC requirements applicable to all types of system configurations.

• IEC 61851 Series
  For electric vehicle conductive charging systems covering charging equipment for EVs.

• IEC 62109 Series
  Safety standards specifically for power converters connected to PV systems.

• IEC 61727
  Photovoltaic system interface with the utility grid-establishing requirements for grid-connected PV inverters.

• IEC 60364 Series
  Electrical installations of buildings, important for addressing protective measures such as earth fault detection.

Conclusion

IEC 62909-2:2019 provides critical extensions to foundational standards to ensure bi-directional grid-connected power converters operate safely, reliably, and efficiently with key distributed energy resources-EVs, batteries, and PV systems. It plays a vital role in standardizing interfaces that are essential for the evolving energy landscape where renewable integration and smart grid technologies are more prevalent. Complying with this standard benefits manufacturers, energy service providers, and end-users by promoting interoperability, safety, and optimized performance within modern electric power systems.

Keywords: IEC 62909-2, bi-directional grid-connected power converters, GCPC, distributed energy resources, electric vehicle interface, battery storage interface, photovoltaic interface, EV charging standard, earth fault detection, renewable energy integration, IEC standards.

Standards Content (Sample)

IEC 62909-2 ®
Edition 1.0 2019-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Bi-directional grid-connected power converters –
Part 2: Interface of GCPC and distributed energy resources

Convertisseurs de puissance connectés aux réseaux bidirectionnels –
Partie 2: Interface du GCPC avec les ressources énergétiques réparties

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
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
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: [e-mail].
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC - Electropedia - www.electropedia.org
webstore.iec.ch/advsearchform Le premier dictionnaire d'électrotechnologie en ligne au
La recherche avancée permet de trouver des publications IEC monde, avec plus de 22 000 articles terminologiques en
en utilisant différents critères (numéro de référence, texte, anglais et en français, ainsi que les termes équivalents dans
comité d’études,…). Elle donne aussi des informations sur les 16 langues additionnelles. Egalement appelé Vocabulaire
projets et les publications remplacées ou retirées. Electrotechnique International (IEV) en ligne.

IEC Just Published - webstore.iec.ch/justpublished Glossaire IEC - std.iec.ch/glossary
Restez informé sur les nouvelles publications IEC. Just 67 000 entrées terminologiques électrotechniques, en anglais
Published détaille les nouvelles publications parues. et en français, extraites des articles Termes et Définitions des
Disponible en ligne et une fois par mois par email. publications IEC parues depuis 2002. Plus certaines entrées
antérieures extraites des publications des CE 37, 77, 86 et
Service Clients - webstore.iec.ch/csc CISPR de l'IEC.

Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
[e-mail].
IEC 62909-2 ®
Edition 1.0 2019-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Bi-directional grid-connected power converters –

Part 2: Interface of GCPC and distributed energy resources

Convertisseurs de puissance connectés aux réseaux bidirectionnels –

Partie 2: Interface du GCPC avec les ressources énergétiques réparties

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.200 ISBN 978-2-8322-6613-7

– 2 – IEC 62909-2:2019  IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 GCPC general specifications . 11
4.1 General . 11
4.2 Description of GCPC and its components . 11
4.3 Operating modes . 11
4.4 Interfaces with distributed energy resources . 11
4.101 Specific requirements for earth fault detection on DC-port interfaces . 12
5 Performance requirements. 12
6 Hazard protection requirements . 12
7 Test requirements . 12
8 Information and marking requirements . 12
101 Interface requirements for EV section . 13
101.1 General system requirement and interface . 13
101.2 Protection against electric shock . 13
101.3 Connection between the power supply and the EV . 13
101.4 EV coupler requirements . 13
101.5 Charging cable assembly requirements . 13
101.6 Specific requirements for GCPC including EV section . 13
101.7 Communication . 13
101.8 Isolation . 14
101.8.1 General . 14
101.8.2 GCPC of system A . 14
101.8.3 GCPC of system B . 14
101.8.4 GCPC of system C. 14
101.9 Connection/disconnection . 15
101.10 Self-start up . 16
101.10.1 General . 16
101.10.2 EV section of system A . 16
101.11 Test requirements and procedures for connection . 19
101.12 EV section requirements . 19
102 Interface requirements for BS section . 19
102.1 General . 19
102.2 System configuration . 19
102.3 Voltage and current requirements . 20
102.3.1 General . 20
102.3.2 Location for the information for selection . 20
102.3.3 Voltage and current ranges . 20
102.4 Requirements of the control port . 21
102.5 Functional safety requirements of the control port . 21
102.6 Installation . 21
103 Interface requirements for PV section . 21
103.1 Protection against arc fault . 21

Bibliography . 23

Figure 101 – GCPC with multiple earth fault detection circuits . 12
Figure 102 – GCPC with EV section . 13
Figure 103 – GCPC with an isolated DC/DC converter in its EV section . 14
Figure 104 – GCPC with a non-isolated DC/DC converter in its EV section . 15
Figure 105 – Active EV section of GCPC with a switch at DC-connection interface side . 15
Figure 106 – Inactive EV section . 16
Figure 107 – Interface circuit for charging/discharging control of system A station . 18
Figure 108 – An example of GCPC containing a battery system with discrete DC/DC
converter . 19
Figure 109 – An example of GCPC containing a battery system with an integrated
dc/dc converter . 20
Figure 110 – External AFD . 22
Figure 111 – Integrated AFD . 22

Table 101 – Alphabetical list of terms . 8
Table 102 – Parameters and values for interface circuit in Figure 107. 17

– 4 – IEC 62909-2:2019  IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
BI-DIRECTIONAL GRID-CONNECTED POWER CONVERTERS –

Part 2: Interface of GCPC and distributed energy resources

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 62909-2 has been prepared by subcommittee 22E: Stabilized
power supplies, of IEC technical committee 22: Power electronic systems and equipment.
This International Standard is to be used in conjunction with IEC 62909-1:2017.
The clauses of particular requirements in this document supplement or modify the
corresponding clauses in IEC 62909-1:2017. Where the text of subsequent clauses indicates
an "addition" to or a "replacement" of the relevant requirement, test specification or
explanation of IEC 62909-1:2017, these changes are made to the relevant text of
IEC 62909-1:2017. Where no change is necessary and the clause is applicable, the words
"The provisions of IEC 62909-1:2017, Clause XX shall apply" are used. Additional clauses,
tables, figures and notes which are not included in IEC 62909-1:2017, are numbered starting
from 101.
The text of this International Standard is based on the following documents:
FDIS Report on voting
22E/196/FDIS 22E/198/RVD
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.
A list of all parts in the IEC 62909 series, published under the general title Bi-directional
grid-connected power converters, can be found on the IEC website.
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.
– 6 – IEC 62909-2:2019  IEC 2019
INTRODUCTION
In order to optimize power consumption, for example, within the nanogrid of a home,
electricity generation should be optimally combined with rechargeable energy storage. This
optimization is accomplished, in part, by providing an efficient transfer between DC and AC
electricity to accommodate storage batteries. The IEC 62909 series describes a bi-directional
grid-connected power converter (GCPC) which efficiently integrates sources of power
generation with energy storage.
IEC 62909-1 defines common general requirements, independent from the special
characteristics of individual applications. This document defines the additional requirements
necessary for interfacing particular types of distributed energy resources to a GCPC.

BI-DIRECTIONAL GRID-CONNECTED POWER CONVERTERS –

Part 2: Interface of GCPC and distributed energy resources

1 Scope
This part of IEC 62909 specifies GCPC interface requirements for particular distributed
energy resources, namely electric vehicle (EV), battery, and photovoltaic (PV) systems. These
requirements are in addition to the general requirements given in IEC 62909-1.
2 Normative references
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.
IEC 60730-1:2013, Automatic electrical controls – Part 1: General requirements
IEC 60730-1:2013/AMD1:2015
IEC 61508 (all parts), Functional safety of electrical/electronic/programmable electronic
safety-related systems
IEC 61851-23:2014, Electric vehicle conductive charging system – Part 23: DC electric
vehicle charging station
IEC 62909-1:2017, Bi-directional grid-connected power converters – Part 1: General
requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62909-1 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
Table 101 provides an alphabetical cross-reference listing of terms.

– 8 – IEC 62909-2:2019  IEC 2019
Table 101 – Alphabetical list of terms
Term Term Term
Term Term Term
number number number
arc fault detector 3.101 distributed energy 3.113 photovoltaic 3.124
resources
AFD PV
arc fault interrupter 3.102 earth fault 3.114 PV DC-port interface 3.125
AFI
battery management 3.103 electric vehicle 3.115 PV section 3.126
system
EV
BMS
battery system 3.104 EV DC/DC converter 3.116 shutdown sequence 3.127
BS
BS section 3.105 EV DC-port interface  3.117
BS DC-port interface 3.106 EV section 3.118
charge/discharge 3.107 fault status signal 3.119
switch
charging connector 3.108 GCPC 3.120
DC-connection 3.109 GCPC fault detection 3.121
interface circuit
DC/DC converter 3.110 grid-independent 3.122
operation
DC-port interface 3.111 isolated DC/DC 3.123
converter
dedicated auxiliary
3.112
power port
Add the following terms and definitions:
3.101
arc fault detector
AFD
device or group of devices to detect arcs
Note 1 to entry: This note applies to the French language only.
3.102
arc fault interrupter
AFI
device able to interrupt arc faults triggered by an arc fault detector
Note 1 to entry: This note applies to the French language only.
3.103
battery management system
BMS
electronic system associated with a battery which has functions to cut off or disconnect it in
case of overcharge, overcurrent, overdischarge, and overheating
Note 1 to entry The BMS monitors and/or manages the battery’s state, calculates secondary data, reports that
data and/or controls the battery’s environment to influence its safety, performance and/or service life.
Note 2 to entry Cut-off or disconnection due to overdischarge is not mandatory if there is an agreement between
the cell manufacturer and the GCPC manufacturer.
Note 3 to entry The function of the BMS can be assigned to the battery pack or to equipment that uses the battery.

Note 4 to entry The BMS can be divided and it can be found partially in the battery pack and partially on the
equipment that uses the battery.
Note 5 to entry The BMS is sometimes also referred to as a BMU (battery management unit).
Note 6 to entry: This note applies to the French language only.
[SOURCE: IEC 62619:2017, 3.12, modified – The definition, Note 1 and Note 2 have been
rephrased.]
3.104
battery system
BS
system which comprises one or more cells, modules or battery packs
Note 1 to entry It has a battery management system to cut off or disconnect it in case of overcharge, overcurrent,
overdischarge, and overheating. Where cells, modules and battery packs employ an acid electrolyte, the BMS may
be absent from the battery system provided that the BMS functions are integral to the BS section
Note 2 to entry Cut-off or disconnection due to overdischarge is not mandatory if there is an agreement between
the cell manufacturer and the GCPC manufacturer
Note 3 to entry The battery system may have cooling or heating units.
[SOURCE: IEC 62619:2017, 3.11, modified – Note 1 and Note 2 have been rephrased.]
3.105
BS section
part of a GCPC between the DC-connection interface and a BS DC-port interface
3.106
BS DC-port interface
DC-port interface connected to a battery system
3.107
charge/discharge switch
switch for preventing unintentional power flow which is located between the DC-connection
interface and a DC/DC converter, or between a DC/DC converter and an EV DC-port interface
3.108
charging connector
means of enabling the manual connection of a flexible cable to an EV for the purpose of
charging the traction batteries
3.109
DC-connection interface
internal system DC bus between the DC/DC converters and the bi-directional inverter
[SOURCE: IEC 62909-1:2017, 3.4, modified – "power electronic" has been replaced with
"DC/DC".]
3.110
DC/DC converter
equipment that converts one DC voltage to another DC voltage
[SOURCE: IEC 62909-1:2017, 3.6]
3.111
DC-port interface
interface between the DC/DC converter and distributed energy resources or, in the case
where the DC-connection interface is directly connected to distributed energy resources

– 10 – IEC 62909-2:2019  IEC 2019
without the DC/DC converter, between the DC-connection interface and the distributed energy
resources
[SOURCE: IEC 62909-1:2017, 3.5]
3.112
dedicated auxiliary power port
special port to supply auxiliary power from the EV to the GCPC to wake up the GCPC from
operating in an idle state
3.113
distributed energy resources
DC power sources generating and/or storing electricity near the consuming area
[SOURCE: IEC 62909-1:2017, 3.9, modified – The note has been deleted.]
3.114
earth fault
occurrence of an accidental conductive path between a live conductor and the Earth
[SOURCE: IEC 60050-826:2004, 826-14-13, modified – The notes have been deleted.]
3.115
electric vehicle
electric road vehicle
EV
any vehicle propelled by an electric motor drawing current from a rechargeable energy
storage system (RESS), intended primarily for use on public roads
[SOURCE: IEC 60364-7-722:2018, 722.3.1]
3.116
EV DC/DC converter
component of the EV section that converts one DC voltage to another DC voltage
3.117
EV DC-port interface
DC-port interface connected to an EV
3.118
EV section
part of a GCPC between the DC-connection interface and an EV DC-port interface
3.119
fault status signal
signal indicating that faults are present which could cause a hazard according to IEC 62909-2
3.120
bi-directional grid-connected power converter
grid-connected power converter
GCPC
power converter connected to the grid by the bi-directional inverter with multiple DC-port
interfaces
Note 1 to entry: This note applies to the French language only.
[SOURCE: IEC 62909-1:2017, 3.19]

3.121
GCPC fault detection circuit
circuit that detects functional faults in a GCPC
3.122
grid-independent operation
electricity supply through GCPC to an AC load during grid isolation
[SOURCE: IEC 62909-1:2017, 3.20]
3.123
isolated DC/DC converter
DC/DC converter with DC circuit on output side which is electrically separated by at least
basic insulation from input side
3.124
photovoltaic
PV
relating to the conversion of light directly into electrical energy
[SOURCE: IEC 62109-1:2010, 3.55]
3.125
PV DC-port interface
DC-port interface connected to a PV system
3.126
PV section
part of a GCPC between the DC-connection interface and a PV DC-port interface
3.127
shutdown sequence
sequence for electrically disconnecting an EV from its DC-connection interface
4 GCPC general specifications
4.1 General
The provisions of IEC 62909-1:2017, 4.1 shall apply.
4.2 Description of GCPC and its components
The provisions of IEC 62909-1:2017, 4.2 shall apply.
4.3 Operating modes
The provisions of IEC 62909-1:2017, 4.3 shall apply.
4.4 Interfaces with distributed energy resources
Addition:
EV, battery system and PV distributed energy resource interfaces shall comply with the
requirements in Clauses 101, 102, and 103, respectively.
NOTE 101 In the case where GCPC requirements conflict with requirements for other distributed energy
resources, manufacturers consider the more stringent requirements.

– 12 – IEC 62909-2:2019  IEC 2019
NOTE 102 As for grid interface of GCPC, a description of the compliance with applicable national requirements is
provided in 5.3.1 of IEC 62909-1:2017.
Add the following new subclause:
4.101 Specific requirements for earth fault detection on DC-port interfaces
Some distributed energy resources require an earth fault detection circuit on the DC-port
interface for safety.
When a GCPC has multiple earth fault detection circuits on its DC-port interfaces, each earth
fault detection circuit shall have little or no influence on any other GCPC fault detection circuit.
An example of a GCPC with multiple earth fault detection circuits is shown in Figure 101.

NOTE Point of the connection is the reference point where the user’s electrical installation is connected to the
grid. Power flows through this point to and from the grid, unless it is disconnected.
Figure 101 – GCPC with multiple earth fault detection circuits
5 Performance requirements
The provisions of IEC 62909-1:2017, Clause 5 shall apply.
6 Hazard protection requirements
The provisions of IEC 62909-1:2017, Clause 6 shall apply.
7 Test requirements
The provisions of IEC 62909-1:2017, Clause 7 shall apply.
8 Information and marking requirements
The provisions of IEC 62909-1:2017, Clause 8 shall apply.
Add the following new clauses:

101 Interface requirements for EV section
101.1 General system requirement and interface
The provisions of IEC 61851-23:2014, Clause 6 shall apply.
For the purposes of Clause 101, each occurrence of “d.c. EV charging station" in the relevant
clauses of IEC 61851-23:2014 referred to in this document shall be replaced with "GCPC
including EV section". An example of a GCPC with an EV section is shown in Figure 102.

Figure 102 – GCPC with EV section
101.2 Protection against electric shock
The provisions of IEC 61851-23:2014, Clause 7 shall apply.
101.3 Connection between the power supply and the EV
The provisions of IEC 61851-23:2014, Clause 8 shall apply
101.4 EV coupler requirements
The provisions of IEC 61851-23:2014, Clause 9 shall apply.
101.5 Charging cable assembly requirements
The provisions of IEC 61851-23:2014, Clause 10 shall apply.
101.6 Specific requirements for GCPC including EV section
The provisions of IEC 61851-23:2014, Clause 101 shall apply.
101.7 Communication
The provisions of IEC 61851-23:2014, Clause 102 shall apply.

– 14 – IEC 62909-2:2019  IEC 2019
101.8 Isolation
101.8.1 General
The EV section should have an isolated DC/DC converter between the DC-connection
interface and its EV DC-port interface, according to IEC 61851-23:2014, 7.5.101. An example
of a GCPC with an isolated DC/DC converter in the EV section is shown in Figure 103.

Figure 103 – GCPC with an isolated DC/DC converter in its EV section
101.8.2 GCPC of system A
For earth fault protection, the provisions of IEC 61851-23: 2014, AA.3.1 shall apply.
NOTE For the purposes of Clause 101, “system A” is identical to that IEC 61851-23:2014, 6.101.1.5.
101.8.3 GCPC of system B
For earth fault protection, the provisions of IEC 61851-23:2014, Clause BB.2 shall apply.
NOTE For the purpose of Clause 101, “system B” is identical to that of IEC 61851-23:2014, 6.101.1.5.
101.8.4 GCPC of system C
For earth fault protection, the provisions of IEC 61851-23:2014, CC.4.1 shall apply.
If the EV section has a non-isolated DC/DC converter, all the other DC/DC converters shall be
isolated from the DC-connection interface. An example of a GCPC with a non-isolated DC/DC
converter in its EV section is shown in Figure 104.
NOTE For the purpose of Clause 101, “system C” is identical to that of IEC 61851-23:2014,6.101.1.5.

Figure 104 – GCPC with a non-isolated DC/DC converter in its EV section
101.9 Connection/disconnection
The GCPC should continue to operate normally when the EV is connected or disconnected.
This requires a charge/discharge switch between the EV DC/DC converter and the DC-
connection interface or between the EV DC/DC converter and the DC-port interface. The
charge/discharge switch shall conform (as applicable) to IEC 61851-23:2014, Clauses AA.2,
BB.2 and CC.7. An example of an active EV section of the GCPC with a switch at the DC-
connection interface side is shown in Figure 105. Figure 106 illustrates that the EV section is
inactive.
NOTE The reverse-current-prevention device of system A can be substituted by a charge/discharge switch.

Figure 105 – Active EV section of GCPC with a switch at DC-connection interface side

– 16 – IEC 62909-2:2019  IEC 2019

Figure 106 – Inactive EV section
101.10 Self-start up
101.10.1 General
During grid-independent operation, the EV may power up and control the GCPC using a
dedicated auxiliary power port to switch on the GCPC and closing the charge/discharge
switch to provide energy from the EV. This is an IEC 61851-23:2014 optional feature.
NOTE Self-start up for system B, system C and multi-outlet is not defined in IEC 61851-23:2014.
101.10.2 EV section of system A
The vehicle may provide an optional function in which the auxiliary power to the station is
supplied through the optional pin of the charging connector, or the cigarette lighter socket. In
such cases, charging/discharging control of the station may be started (and operated) by the
auxiliary power supplied from the vehicle, and the station shall draw the power through the
terminals AS1 or AS2 shown in Figure 107. Parameters and values for the interface circuit are
shown in Table 102.
Additional requirements for actuating the unintended current flow prevention circuit are shown
in Figure 107. If the optional function is used, the EV section shall monitor the status of the
unintentional current flow prevention circuit during the EV discharging process. If the
requirements are not satisfied, the station shall transfer to shutdown sequence.

Table 102 – Parameters and values for interface circuit in Figure 107
System A station
Terminal/ Parameters Minimum Typical Maximum Unit
Wire value value value
CP +V DC 10,8 12,0 13,2 V
CS Resistor R1 190 200 210
Ω
CP3 Resistor R2 950 1 000 1 050 Ω
CP Load current of switch d1 2 2 000 mA
CP2 Load current of switch d2 2 2 000 mA
Voltage 12 16 V
AS1
Current  6,4 A
Voltage 12 16 V
AS2
Current  6,4 A
Electric vehicle
CP Load current (when d1 and d2 closing) 10 2 000 mA
CP2 Load current (when d1 and d2 closing) 10 2 000 mA
Resistor R3 950 1 000 1 050 Ω
CS
+V DCE 8 12 16 V
CP3 Resistor R4 190 200 210 Ω
Voltage 12 16 V
Current  6,4 A
AS1
Rated fuse  10 A
Voltage 12 16 V
NOTE Voltage of AS1 or AS2 is different from +VDC.

Resistance of AS1, AS2 and protective conductor: Each resistance shall be less than the line
resistance equivalent to the one on the conditions of conductor temperature 80°C, 1,25 mm
and 7,5 m (15 m for round-trip).

– 18 – IEC 62909-2:2019  IEC 2019

Key
1 AS2 to which the power is supplied from cigarette socket.
2 The fuse is a reference example, e.g. a fuse in a cigarette socket.
3 The diode is a reference example. It prevents reverse current to the auxiliary battery.
Figure 107 – Interface circuit for charging/discharging control of system A station

101.11 Test requirements and procedures for connection
The EV section shall comply with applicable national requirements.
101.12 EV section requirements
The provisions of IEC 61851-23:2014, Clause 11 shall apply.
NOTE 1 IEC 61851-23:2014 states only charging function but the EV section has function of both charging and
discharging.
NOTE 2 Connection of a GCPC providing EVSE to an unmetered connection is subject to local regulations.
102 Interface requirements for BS section
102.1 General
Clause 102 describes minimum requirements for the BS section of GCPC. Clause 102 shall
not apply to a BS section that includes a dedicated interface for specific battery systems.
NOTE Requirements for dedicated battery system interfaces are determined by GCPC and battery system
manufacturers.
102.2 System configuration
Figures 108 and 109 illustrate typical system configurations of a GCPC with a battery system.

Figure 108 – An example of GCPC containing a battery system
with discrete DC/DC converter
– 20 – IEC 62909-2:2019  IEC 2019

Figure 109 – An example of GCPC containing a battery system with
an integrated dc/dc converter
102.3 Voltage and current requirements
102.3.1 General
BS DC-port interface voltage and current shall comply with the DC-connection interface or
DC-port interface requirements.
The manufacturer shall provide the information for battery system selection according to
102.3.2 and 102.3.3.
102.3.2 Location for the information for selection
The manufacturer shall provide information in the locations specified below for the selection
of the battery system:
a) on the product (see IEC 62909-1:2017, 8.4.3),
b) on the packaging,
c) in the installation manual,
d) in the user’s manual, or
e) in the maintenance manual.
In the case of d) and e), the installation, user’s and maintenance manuals may be combined
as appropriate and, if acceptable to the customer, may be supplied in electronic format. When
more than one of any product is supplied to a single customer, it is not necessary to supply a
manual with each unit, if acceptable to the customer.
102.3.3 Voltage and current ranges
The information includes, but is not limited to, electrical ratings for BS DC-port interface as
follows:
– nominal operation voltage range,

– maximum charging/discharging current.
NOTE The relevant parameters are specified in IEC 62619:2017.
102.4 Requirements of the control port
The control port shall include a fault status signal sent from the battery system to the GCPC.
When the battery system asserts the fault status signal, indicating that a fault condition or
other hazardous condition has occurred, the GCPC shall take appropriate actions to ensure
the safety of the overall system.
The action is prohibition of charging and/or discharging.
102.5 Functional safety requirements of the control port
Safety circuits responsible for the reliable transmission and reception of the fault status signal
shall comply with suitable functional safety requirements, such as IEC 60730-1:2013 and
IEC 60730-1:2013/AMD1:2015, Annex H, IEC 61508 (all parts), or national standards.
102.6 Installation
The manufacturer shall attach a caution label at the BS DC-port interface instructing the
installer to install the proper battery system.
103 Interface requirements for PV section
103.1 Protection against arc fault
In countries and regions that require the detection and interruption of DC arcs in
photovoltaic systems, an arc fault detector (AFD) and an arc fault interrupter (AFI) shall
be installed between photovoltaic energy sources and the DC/DC converters.
Arc fault detector performance requirements are defined in IEC 63027 .
In the case where a GCPC has no integrated AFD, the combination of the DC/DC converter,
the bi-directional inverter and the external AFD has to be tested as a system to prevent
malfunction of the AFD by electromagnetic interference. An example of an external AFD is
shown in Figure 110.
_____________
Under preparation. Stage at the time of publication IEC/PCC 63027:2018.

– 22 – IEC 62909-2:2019  IEC 2019

Figure 110 – External AFD
In the case where a GCPC has an integrated AFD, the DC/DC converters and the bi-
directional inverter shall be designed to prevent malfunction of the AFD. An example of an
integrated AFD is shown in Figure 111.
NOTE In the case AFD and AFI are combined together and are integrated in GCPC, the function of AFD and AFI
are appropriately designed by the GCPC manufacturer.

Figure 111 – Integrated AFD
Bibliography
IEC 60050-826, International Electrotechnical Vocabulary – Part 826: Electrical installations
(available at http://www.electropedia.org)
IEC 60364-7-722:2018, Low-voltage electrical installations – Part 7-722: Requirements for
special installations or locations – Supplies for electric vehicles
IEC 61851-1:2017, Electric vehicle conductive charging system – Part 1: General
requirements
IEC 61982:2012, Secondary batteries (except lithium) for the propulsion of electric road
vehicles – Performance and endurance tests
IEC 62109-1:2010, Safety of power converters for use in photovoltaic power systems – Part 1:
General requirements
IEC 62619:2017, Secondary cells and batteries containing alkaline or other non-acid
electrolytes – Safety requirements for secondary lithium cells and batteries, for use in
industrial applications
IEC 63027 , DC Arc detection and interruption in photovoltaic power systems

___________
_____________
Under preparation. Stage at the time of publication IEC/PCC 63027:2018.

– 24 – IEC 62909-2:2019  IEC 2019
SOMMAIRE
AVANT-PROPOS . 26
INTRODUCTION . 28
1 Domaine d'application . 29
2 Références normatives . 29
3 Termes et définitions . 29
4 Spécification générale du GCPC . 34
4.1 Généralités . 34
4.2 Description du GCPC et de ses composants . 34
4.3 Modes de fonctionnement . 34
4.4 Interfaces avec ressources énergétiques réparties. 34
4.101 Exigences spécifiques pour la détection des défauts à la terre sur les
interfaces d'accès en courant continu . 34
5 Exigences de performance . 35
6 Exigences en matière de protection contre le danger . 35
7 Exigences d'essai . 35
8 Exigences relatives aux informati
...