IEC TR 62786-100:2026

IEC TR 62786-100 ®
Edition 1.0 2026-02
TECHNICAL
REPORT
Distributed energy resources connection with the grid -
Part 100: Generating plants and units grid connection standard mapping

ICS 17.220.99; 91.140.50; 29.240.01 ISBN 978-2-8327-1048-7

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.

IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
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 - IEC Products & Services Portal - products.iec.ch
webstore.iec.ch/advsearchform Discover our powerful search engine and read freely all the
The advanced search enables to find IEC publications by a
publications previews, graphical symbols and the glossary.
variety of criteria (reference number, text, technical With a subscription you will always have access to up to date
committee, …). It also gives information on projects, content tailored to your needs.
replaced and withdrawn publications.

Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published containing more than 22 500 terminological entries in English
details all new publications released. Available online and and French, with equivalent terms in 25 additional languages.
once a month by email. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer
Service Centre: sales@iec.ch.
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General . 6
5 Basic policy. 7
5.1 Structure of technical committees related to renewable energy and
distributed energy resources . 7
5.2 Types of publications related to the connection of DER with the grid . 8
5.2.1 General. 8
5.2.2 Basic publications . 9
5.2.3 System publications . 9
5.2.4 Testing publications . 9
5.2.5 Product publications . 9
5.3 Basic rules for drafting publications related to the connection of DER with

the grid . 10
Annex A (informative) Basic publications. 12
A.1 General . 12
A.2 List of publications relevant to vocabularies . 12
A.3 List of publications relevant to measurements . 12
A.4 List of publications relevant to protection relay . 13
A.5 List of publications relevant to switchgear . 13
A.6 List of publications relevant to power quality and EMC . 13
A.7 List of publications relevant to information exchange . 14
A.8 List of publications relevant to electrical safety . 15
Annex B (informative) System publications . 16
B.1 General . 16
B.2 List of system publications . 16
Annex C (informative) Testing publications . 17
C.1 General . 17
C.2 List of testing publications . 17
Annex D (informative) Product publications . 18
D.1 General . 18
D.2 List of publications regarding testing provisions . 18
Annex E (informative) National and regional standards and regulations . 19
Bibliography . 22

Figure 1 – Structure of the IEC 62786 series . 7
Figure 2 – Structure of technical committees . 8
Figure 3 – Basic and system publications relevant to grid connection. 10

Table 1 – Types of publications related to the connection of DER with the grid . 8
Table 2 – Requirements for generating plants and systems . 10
Table 3 – Requirements for power generating units . 11
Table 4 – Items to be provided in product publications . 11
Table A.1 – Publications relevant to vocabularies . 12
Table A.2 – Publications relevant to measurements . 12
Table A.3 – Publications relevant to protection relay . 13
Table A.4 – Publications relevant to switchgear . 13
Table A.5 – Publications relevant to power quality and EMC . 13
Table A.6 – Publications relevant to information exchange. 14
Table A.7 – Publications relevant to electrical safety . 15
Table B.1 – List of system publications . 16
Table C.1 – List of testing publications . 17
Table D.1 – List of publications regarding testing provisions . 18
Table E.1 – List of national and regional standards and regulations . 19

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Distributed energy resources connection with the grid -
Part 100: Generating plants and units grid connection standard mapping

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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC TR 62786-100 has been prepared by IEC technical committee 8: System aspects of
electrical energy supply. It is a Technical Report.
The text of this Technical Report is based on the following documents:
Draft Report on voting
8/1782/DTR 8/1796/RVDTR
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Technical Report is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 62786 series, published under the general title Distributed energy
resources connection with the grid, 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 webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
INTRODUCTION
A mapping platform for grid connection is available to the IEC [1] . It can be used not only to
model an existing standard collection (typically in the scope of a system committee, or of a
technical entity, or on a standard series), but also a portfolio of projects. It can also be published
and used as a browsing facility for stakeholders. One very interesting aspect of this mapping
tool is that such mapping tool is not tied to IEC standards: any standards contributing to the
scope of interest of the map can be added and referred, including hyperlinks to the web location
where further details could be found. Such mapping tool can really deliver to public users a
holistic view of standardization efforts and existing deliverables of a given technical scope, and
as such favour and promote the use of relevant standards in that scope.
SMB already approved the set of Mapping Platform rules and agreed on the principles and
concept (SMB/7088A/RV). Implementation, communication to and training for technical and
advisory bodies started in September 2020 with webinars and the publication of AC/39/2020
including a user’s guide.
___________
Numbers in square brackets refer to the Bibliography.
1 Scope
This document gives guidance for the drafting of IEC publications which relate, wholly or partly,
to connection of distributed energy resources (DER) with the grid. Technical committees
relevant to the connection of DER with grid are advised to follow the guidance given in this
document when they prepare new publications and clauses relevant to the connection of DER
with the grid, as well as when they revise existing publications so that consistent and
harmonized standards can be delivered.
Annex A, Annex B, Annex C, and Annex D list documents relevant to grid connection of DER in
order to ensure that other IEC publications are consistent with these documents and to avoid
overlapping each other.
Table E.1 lists national and regional standards and regulations relevant to connecting DER with
the grid.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
4 General
The standardization of requirements for DER regarding grid connection is in line with the needs
of the users and system operators for integrating renewable energy and facilitating the
development of the smart grid. IEC TS 62786:2017 , provides technical specifications for DER
regarding grid connection.
However, during the development of IEC TS 62786, the importance of addressing specific type
of DER when going into the detail during standardization, while avoiding overlap with exiting
IEC standards on safety, electromagnetic compatibility (EMC), environment, etc., was
recognized. Therefore, JWG10 was established under TC8 in 2018. JWG10 stared initially with
TC82 because TC82 proposed to develop a standard on grid connection requirements for solar
photovoltaic energy systems on the basis of IEC TS 62786 and to publish it as a sub-part of
IEC TS 62786. Accordingly, JWG10 had a kick off meeting with TC82 and TC120 in March,
2018 and agreed to start the development of IEC TS 627867 series which consisted of the
following parts at that time:
– IEC TS 62786-1: Distributed energy resources connection with the grid - Part 1: General
requirements;
– IEC TS 62786-2: Distributed energy resources connection with the grid - Part 2 Additional
requirements for PV generation;
___________
This publication has been withdrawn.
– IEC TS 62786-3: Distributed energy resources connection with the grid - Part 3 Additional
requirements for stationary battery energy storage system.
JWG10 agreed that IEC TS 62786 series would intend to provide with a general framework for
requirements for connection of DER with the grid and that each part would be developed in
cooperation with or by the relevant technical committees. During the JWG10 meeting which was
held in October, 2018, JWG10 started considerations of the structure of the IEC 62786 series,
and in October 2021, TC8-CAG consequently agreed on the structure of the IEC 62786 series
as shown in Figure 1.
Figure 1 – Structure of the IEC 62786 series
Agreement of standardization policy for the IEC 62786 series is as follows:
– IEC 62786 series has a hierarchical structure;
– the top layer is IEC 62786-1, which specifies system requirements for plants;
– IEC 62786-11 specifies requirements on interoperability and configurability with
communication interface relevant to grid connection;
– IEC 62786-20 specifies basic grid connection requirements for power conversion equipment;
– IEC 62786-30 provide basic common testing requirements for power conversion equipment
which connects with grid in order to evaluation requirements specified in IEC 62786-20;
– referring to parts which stipulate requirements on grid connection, each technical committee
defines testing provisions for evaluating the performance of their own product.
5 Basic policy
5.1 Structure of technical committees related to renewable energy and distributed
energy resources
Figure 2 shows the structure of technical committees related to renewable energy and
distributed energy resources. TC 8 and TC 57 are power system committees having
responsibility for developing requirements relevant to grid connection management and
associated information exchange for DER. TC 82, TC 88, etc., which have power plants and
products as distributed generating systems and generators connected with the grid, are advised
to consult the documents which were developed by power system committees, so that they can
specify testing provisions for their own plants and products.
Figure 2 – Structure of technical committees
5.2 Types of publications related to the connection of DER with the grid
5.2.1 General
IEC publications related to the connection of DER with the grid can be divided into four
categories as shown in Table 1, which are described in 5.2.2 to 5.2.5. Table 1 shows items
covered in these publications and TCs which are responsible for these publications.
Table 1 – Types of publications related to the connection of DER with the grid
Types of publications Items to be covered TCs
Basic publications Terms and definitions TC 8, TC 77,
TC 85, TC 95,
Measurements
TC 57
Protection relay
Switchgear
Power quality
EMC
Information exchange
System publications regarding Power system TC 8
grid connection requirements
Photovoltaic power generating
system
Wind energy generation system
Electrical energy storage
system
Types of publications Items to be covered TCs
Testing publications regarding Distributed energy resources TC 82, TC 88,
grid connection and common TC 120, etc.
Photovoltaic power generating
testing requirements for power
system
generating plants and unis
Wind energy generation system
Electrical energy storage
system, etc.
Product publications regarding Operational characteristic TC 82, TC 88,
testing provisions for each TC 120, etc.
Protection
product
Immunity to disturbances
Power flow control
Information exchange for
monitoring and control
5.2.2 Basic publications
Basic publications give the fundamental technical principles, characteristics and specifications
for components integrated in DER, as well as requirements on power quality and EMC relevant
to grid connection. Basic requirements regarding information exchange to implement
interoperability and configurability are also given.
Basic publications cover terms and definitions provided by several technical committees.
Relevant standards are listed from Table A.1 to Table A.7 in Annex A.
5.2.3 System publications
System publications provide principles and general technical requirements at the system and
plant levels for DER connected to an electric power network. These requirements are intended
for application at the point of connection (POC) of the DER to the grid.
Relevant standards are listed in Table B.1 of Annex B.
5.2.4 Testing publications
Testing publications provide requirements for testing provisions for grid connection,
interoperation and reconfiguration for power generating plants.
Relevant standards are listed in Table C.1 of Annex C.
5.2.5 Product publications
Product publications provide requirements for testing provisions for grid connection,
interoperation and reconfiguration for power generating units such as power conversion
equipment and rotating machines of which DER is composed.
Relevant standards are listed in Table D.1 of Annex D.
5.3 Basic rules for drafting publications related to the connection of DER with the
grid
As can be seen in Figure 3, basic and system publications are standardized by power system
committees such as TC 8 and TC 57 in cooperation with technical committees such as TC 82,
TC 120, and TC 22. Basic publications relevant to requirements on power quality and EMC are
provided by SC 77A. Basic publications relevant to measuring equipment for electrical
quantities are provided by TC 85, and basic publications relevant to measuring relays and
protection equipment are provided by TC 95.
TC 8/JWG 10 has the responsibility for developing system publications which provide principles
and general technical requirements for DER connected to the grid. Referring to the basic
publications, TC 8/JWG 10 also has the responsibility for developing unit publications.

Figure 3 – Basic and system publications relevant to grid connection
System publications provide requirements for generating plants as shown in Table 2.
Table 2 – Requirements for generating plants and systems
Items to be required
1 Connection scheme
2 Choice of switchgear
3 Normal operating range of frequency and voltage
4 Immunity to disturbances
5 Active power response to frequency deviati
...