IEC 62934:2021

IEC 62934 ®
Edition 1.0 2021-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Grid integration of renewable energy generation – Terms and definitions
Intégration de la production d’énergie renouvelable aux réseaux électriques –
Termes et définitions
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IEC 62934 ®
Edition 1.0 2021-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Grid integration of renewable energy generation – Terms and definitions

Intégration de la production d’énergie renouvelable aux réseaux électriques –

Termes et définitions
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.010; 29.020 ISBN 978-2-8322-9621-9

– 2 – IEC 62934:2021 © IEC 2021
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
3.1 Terms and definitions for renewable energy generation . 6
3.2 Terms and definitions for grid aspects and requirements. 8
3.3 Terms and definitions for modelling, analysis and planning . 15
3.4 Terms and definitions for control and protection . 17
3.5 Terms and definitions for forecasting . 20
3.6 Terms and definitions for grid compliance test and assessment . 21
3.7 Terms and definitions for scheduling, dispatching and market . 22
3.8 Miscellaneous terms and definitions . 25
4 Acronyms and abbreviations . 27
Annex A (informative) Illustration of unit, plant, cluster and kinds of points . 28
Index of terms . 32
Bibliography . 37

Figure 1 – Examples of basic electronic power converters . 26
Figure A.1 – Typical forms of renewable energy generating units . 28
Figure A.2 – Typical forms of renewable energy power plants . 30
Figure A.3 – Cluster of renewable energy power plants . 31

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
GRID INTEGRATION OF RENEWABLE ENERGY GENERATION –
TERMS AND DEFINITIONS
FOREWORD
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IEC 62934 has been prepared by subcommittee 8A: Grid Integration of Renewable Energy
Generation, of IEC technical committee 8: System aspects of electrical energy supply. It is an
International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
8A/75/FDIS 8A/79/RVD
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 International Standard is English.
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described in greater detail at www.iec.ch/standardsdev/publications.

– 4 – IEC 62934:2021 © IEC 2021
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INTRODUCTION
The purpose of this terminology document is to provide terms and definitions for all publications
under the responsibility of SC 8A. In this document, renewable energy generation is the electric
power generation which uses renewable energy as its primary source for the conversion into
electricity.
All SC 8A normative documents to be published should keep consistency with this International
Standard (IS). This IS will be revised together with other SC 8A publications in order to avoid
mismatches when necessary.
From the technical point of view, grid integration of renewable energy generation is a
interdisciplinary complex technical field which is concerned with basic equipment, system
integration, control and protection, operation and dispatch, market and trade and so on. Without
a strong standardization of terminology, focal terms can have a different understanding by
different countries, parties, and technical areas. Harmonised vocabulary is critical also from the
market point of view. It impacts economics and this can become a barrier to commerce. The
correct comparison among different options is fundamental, therefore basic terms and
definitions impact economic decisions.
Several IEC product standards give definitions of certain terms which are necessary for the
understanding of how to design, manufacture and use of those pr
...