SIST EN IEC 62933-1:2018

SLOVENSKI STANDARD
SIST EN IEC 62933-1:2018
01-julij-2018
(OHNWULþQHQDSUDYH]DVKUDQMHYDQMHHQHUJLMH((6GHO7HUPLQRORJLMD,(&

Electrical Energy Storage (EES) systems - Part 1: Terminology (IEC 62933-1:2018)
Ta slovenski standard je istoveten z: EN IEC 62933-1:2018
ICS:
01.040.27 Prenos energije in toplote Energy and heat transfer
(Slovarji) engineering (Vocabularies)
27.010 Prenos energije in toplote na Energy and heat transfer
splošno engineering in general
SIST EN IEC 62933-1:2018 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 62933-1:2018

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SIST EN IEC 62933-1:2018


EUROPEAN STANDARD EN IEC 62933-1

NORME EUROPÉENNE

EUROPÄISCHE NORM
April 2018
ICS 01.040.17

English Version
Electrical Energy Storage (EES) systems - Part 1: Vocabulary
(IEC 62933-1:2018)
Systèmes de stockage de l'énergie électrique (EES) - Partie Elektrische Energiespeichersysteme (EES-Systeme) - Teil
1: Vocabulaire 1: Terminologie
(IEC 62933-1:2018) (IEC 62933-1:2018)
This European Standard was approved by CENELEC on 2018-04-03. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
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Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, 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
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 62933-1:2018 E

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EN IEC 62933-1:2018 (E)
European foreword
The text of document 120/116/FDIS, future edition 1 of IEC 62933-1, prepared by IEC/TC 120
"Electrical Energy Storage (EES) Systems" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN IEC 62933-1:2018.

The following dates are fixed:
(dop) 2019-01-03
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2021-04-03
standards conflicting with the
document have to be withdrawn

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.

Endorsement notice
The text of the International Standard IEC 62933-1:2018 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60027 (series) NOTE Harmonized as EN 60027 (series).
IEC 60964:2009 NOTE Harmonized as EN 60964:2010 (not modified).
IEC 61165:2006 NOTE Harmonized as EN 61165:2006 (not modified).
IEC 61427-2:2015 NOTE Harmonized as EN 61427-2:2015 (not modified).
IEC 61987-1:2006 NOTE Harmonized as EN 61987-1:2006 (not modified).
1
IEC 62040-1:2017 NOTE Harmonized as EN IEC 62040-1 .
IEC 62477-1:2012 NOTE Harmonized as EN 62477-1:2012 (not modified).
ISO 19353:2015 NOTE Harmonized as EN ISO 19353:2016 (not modified).



1
To be published. Stage at the time of publication: FprEN 62040-1:2017.
2

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SIST EN IEC 62933-1:2018




IEC 62933-1

®


Edition 1.0 2018-02




INTERNATIONAL



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Electrical energy storage (EES) systems –

Part 1: Vocabulary




Systèmes de stockage de l’énergie électrique (EES) –

Partie 1: Vocabulaire















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


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CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions for EES systems classification . 6
4 Terms and definitions for EES systems specification . 9
5 Terms and definitions for EES systems planning and installation . 22
6 Terms and definitions for EES systems operation . 24
7 Terms and definitions for EES systems safety and environmental issues . 27
Annex A (informative) Index . 30
A.1 Terms index . 30
A.2 Abbreviated terms index . 32
Bibliography . 33

Figure 1 – Illustrative example of EES system charging/discharging cycle . 10
Figure 2 – Illustrative example of EES system power capability chart . 12
Figure 3 – Illustrative example of EES system response performances . 20
Figure 4 – EES system architecture with one POC type . 22
Figure 5 – EES system architecture with two POC types . 23

Table 1 – Illustrative example of EES system efficiency chart . 18

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IEC 62933-1:2018 © IEC 2018 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

ELECTRICAL ENERGY STORAGE (EES) SYSTEMS –

Part 1: Vocabulary

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,
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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
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Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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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.
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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 62933-1 has been prepared by IEC technical committee 120:
Electrical Energy Storage (EES) Systems.
The text of this standard is based on the following documents:
FDIS Report on voting
120/116/FDIS 120/119/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 62933 series, published under the general title Electrical energy
storage (EES) systems, can be found on the IEC website.

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The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.

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INTRODUCTION
The purpose of this terminology document is to provide terms and definitions for all the
publications under the responsibility of TC 120, that standardize electrical energy storage
systems (EES systems) including unit parameters, test methods, planning, installation, safety
and environmental issues. An EES system includes any type of grid-connected energy
storage which can both store electrical energy and provide electrical energy (from electricity
to electricity).
All TC 120 normative documents are subject to revision, this part of IEC 62933 will be revised
together with other TC 120 publications in order to avoid mismatches.
From the technical point of view, an EES system can be a complex multi stage system with
several possible energy conversions. Each stage is made by components well standardized
(e.g. transformers, power converter systems) or innovative components (e.g. new types of
batteries). Several IEC product standards give definitions necessary for the understanding of
certain terms used for these components. The International Electrotechnical Vocabulary (IEV,
IEC 60050, http://www.electropedia.org), the IEC Glossary (http://std.iec.ch/glossary) and the
ISO Online Browsing Platform (OBP, http://www.iso.org/obp) allow on-line access to this
information. This terminology document completes the scenario by giving definitions
necessary at the system level.
Without a strong standardization of EES systems terminology, focal terms can have a different
meaning in EES systems related to different storage technologies. This aspect is critical also
from the market point of view, it impacts economics and this can become a barrier for tender
processes. The correct comparison among different options is fundamental, therefore basic
terms and definitions impact economic decisions.
Terms and definitions have been harmonized with the IEV, the OBP, the IEC Glossary and
other IEC documents as far as possible. Definitions not included in this terminology document
may be found elsewhere in other IEC documents.
The use of abbreviated terms has been optimized, on the one hand to avoid tedious repetition
and, on the other hand to avoid confusion. A minimum set of abbreviated terms was identified
and used in the definitions, the other terms are written out in full spelling when needed. The
widely accepted abbreviated terms are:
EESS – EES System – Electrical energy storage system;
EES – Electrical energy storage;
POC – Point of connection.

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ELECTRICAL ENERGY STORAGE (EES) SYSTEMS –

Part 1: Vocabulary



1 Scope
This part of IEC 62933 defines terms applicable to electrical energy storage (EES) systems
including terms necessary for the definition of unit parameters, test methods, planning,
installation, safety and environmental issues.
This terminology document is applicable to grid-connected systems able to extract electrical
energy from an electric power system, store it internally, and inject electrical power to an
electric power system. The step for charging and discharging an EES system may comprise
an energy conversion.
2 Normative references
There are no normative references in this document.
3 Terms and definitions for EES systems classification
3.1
electrical energy storage
EES
installation able to absorb electrical energy, to store it for a certain amount of time and to
release electrical energy during which energy conversion processes may be included
EXAMPLE A device that absorbs AC electrical energy to produce hydrogen by electrolysis, stores the hydrogen,
and uses that gas to produce AC electrical energy is an electrical energy storage.
Note 1 to entry: The term “electrical energy storage” may also be used to indicate the activity that an apparatus,
described in the definition, carries out when performing its own functionality.
Note 2 to entry: The term “electrical energy storage” should not be used to designate a grid-connected installation,
"electrical energy storage system" is the appropriate term.
3.2
electrical energy storage system
EES system
EESS
grid-connected installation with defined electrical boundaries, comprising at least one
electrical energy storage, which extracts electrical energy from an electric power system,
stores this energy internally in some manner and injects electrical energy into an electrical
power system and which includes civil engineering works, energy conversion equipment and
related ancillary equipment
Note 1 to entry: The EES system is controlled and coordinated to provide services to the electric power system
operators or to the electric power system users.
Note 2 to entry: In some cases, an EES system may require an additional energy source (non electrical) during its
discharge, providing more energy to the electric power system than the energy it stored (compressed air energy
storage is a typical example where additional thermal energy is required).
Note 3 to entry: ”electric power system” is defined in IEC 60050-601:1985, 601-01-01.

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3.3
utility grid
part of an electric power network that is operated by a utility or grid operator within a defined
area of responsability
Note 1 to entry: Utility grid is normally used for electricity transfer from or to grid users or other grids. The grid
users can be electricity producers or consumers. The area of responsability is fixed by national legislation or
regulation.
Note 2 to entry: “electric power network” is defined in IEC 60050-601:1985, 601-01-02.
3.4
grid-connected, adj
connected to an electric power system
Note 1 to entry: ”electric power system” is defined in IEC 60050-601:1985, 601-01-01.
3.5
low voltage EESS
EES system designed to be connected to a low voltage primary POC
Note 1 to entry: Low voltage (abbreviated term: LV) is defined in IEC 60050-601:1985, 601-01-26.
3.6
medium voltage EESS
EES system designed to be connected to a medium voltage primary POC
Note 1 to entry: Medium voltage (abbreviated term: MV) is defined in IEC 60050-601:1985, 601-01-28.
3.7
high voltage EESS
EES system designed to be connected to a high voltage primary POC
Note 1 to entry: High voltage (abbreviated term: HV) is defined in IEC 60050-601:1985, 601-01-27.
3.8
residential EESS
EES system designed for residential customer applications, excluding commercial, industrial
or other professional activities
Note 1 to entry: A residential EES system is normally compliant with the applicable standards for residential
devices (e.g. electromagnetic compatibility), tipically, its rated apparent power does not exceed the household
installed power.
Note 2 to entry: ”residential customer” is defined in IEC 60050-617:2009, 617-02-05.
3.9
commercial and industrial EESS
EES system designed for commercial or industrial customer applications or other professional
activities
Note 1 to entry: A commercial and industrial EES system is normally compliant with the applicable standards for
commercial or industrial devices (e.g. electromagnetic compatibility).
3.10
utility EESS
EES system as a component of a utility grid, which exclusively provides services to the utility
grid
3.11
self-contained EES system
EES system whose components have been matched and assembled at the factory, that is
shipped in one or more containers, and that is ready to be installed in the field

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Note 1 to entry: ”container” is defined in IEC 62686-1:2015, 3.1.2.
3.12
long duration application
long term application
energy intensive application
EES system application generally not very demanding in terms of step response
performances but with long charge and discharge phases at variable powers
Note 1 to entry: Reactive power exchange with the electric power system may be present along with the active
power exchange.
Note 2 to entry: ”electric power system” is defined in IEC 60050-601:1985, 601-01-01.
3.12.1
active power flow control
long duration application of an EES system used to compensate partially or totally the active
power flow in a determined subsection of an electric power system
EXAMPLE Load shaving or levelling or shifting are active power flow controls.
Note 1 to entry: Active power flow control may require hours of continuous EES system charge or discharge.
Note 2 to entry: ”electric power system” is defined in IEC 60050-601:1985, 601-01-01.
3.12.2
feeder current control
long duration application of an EES system used to maintain a feeder current within defined
limits through active power exchange with the electric power network
EXAMPLE Congestion relief is a feeder current control.
Note 1 to entry: Theoretically, reactive power exchange may also allow the feeder current control, but, because of
the typical feeder power factors, only the active power exchange is really effective.
Note 2 to entry: ”electric power network” is defined in IEC 60050-601:1985, 601-01-02.
3.13
short duration application
short term application
power intensive application
EES system application generally demanding in terms of step response performances and
with frequent charge and discharge phase transitions or with reactive power exchange with
the electric power system
Note 1 to entry: ”electric power system” is defined in IEC 60050-601:1985, 601-01-01.
3.13.1
grid frequency control
short duration application of an EES system used for the stabilization of the electric power
system frequency through active power exchange
Note 1 to entry: The balancing of temporal variations of grid frequency occurs typically over time periods of the
order of seconds to minutes.
Note 2 to entry: ”electric power system” is defined in IEC 60050-601:1985, 601-01-01.
3.13.2
nodal voltage control
short duration application of an EES system used for the stabilization of the voltage at the
primary POC or neighbouring nodes through active or reactive power exchange
Note 1 to entry: Reactive power is generally used in HV and MV grids, active power in LV grids, depending of the
resistance-to-reactance (R/X) ratio of the relevant lines.

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3.13.3
power quality events mitigation
short duration application of an EES system used to mitigate conducted disturbances in
electric power systems such as short supply interruptions, voltage dips, voltage swells,
voltage and currents harmonics, transient overvoltages, rapid voltage changes through active
or reactive power exchange with the electric power network
Note 1 to entry: The mitigation of power quality events (except supply interruptions and harmonics) occurs
typically over time periods of the order of milliseconds to seconds.
Note 2 to entry: In power quality events mitigation, active and reactive power exchange may be intended also in
relation to harmonics and interharmonics.
Note 3 to entry: Theoretically, a supply interruption can have a long duration, practically, most of them have a
duration ≤ 1 min. The mitigation of events with a duration > 1 min is defined as outage mitigation.
Note 4 to entry: ”electric power network” is defined in IEC 60050-601:1985, 601-01-02; “power quality” is defined
in IEC 60050-617:2009, 617-01-05; “power quality events” are defined in IEC TS 62749:2015.
3.13.4
reactive power flow control
short duration application of an EES system used to compensate partially or totally the
reactive power flow in a determined subsection of an electric power system
EXAMPLE Power factor adjustment of loads, normally obtained by capacitor banks, is a reactive power flow
control.
Note 1 to entry: ”electric power system” is defined in IEC 60050-601:1985, 601-01-01.
3.14
hybrid and emergency application
EES system application generally very demanding in terms of step response performances
but with frequent and long discharge phases at variable discharge power
3.14.1
outage mitigation
back-up power
hybrid and emergency application of an EES system used to provide electrical energy during
a specified time and for a pre-defined maximum power, during which the main electrical
energy supply is not available at the primary POC
Note 1 to entry: Theoretically, a supply interruption can have a long duration, practically, most of them have a
duration ≤ 1 min. The mitigation of events with a duration ≤ 1 min is defined as power quality events mitigation.
Note 2 to entry: ”power quality” is defined in IEC 60050-617:2009, 617-01-05; “power quality events” are defined
in IEC TS 62749:2015.
4 Terms and definitions for EES systems specification
4.1
duty-cycle,
combination of controlled phases (charge phase, pause, discharge phase, etc.) starting from
an initial state of charge and ending to a final state of charge, used in the EES system
characterization, specification and testing for a certain operating mode
4.1.1
charging/discharging cycle
EES system duty-cycle consisting of four controlled phases from an initial state of charge to a
final state of charge, in particular: a charge phase, then a pause, then a discharge phase and
finally a new pause
Note 1 to entry: In Figure 1, T is the duration of the charge phase, E is the energy measured at the primary POC
1 1
during the charge phase, T is the duration of the pause after charge, E = 0 (so it is omitted in the figure), T is the
2 2 3
duration of the discharge phase, E is the energy measured at the primary POC during the discharge phase, T is
3 4

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the duration of the pause after the discharge, E = 0 (so it is omitted in the figure) and E is the initial state of
4 0
charge. T = 0 or T = 0 are possible options. The patterns of the charge and discharge phases are generally linear
2 4
(constant active power); however different patterns are possible as well.
E
T T T T t
1 2 3 4
IEC

Figure 1 – Illustrative example of EES system charging/discharging cycle
4.1.2
predetermined charging/discharging cycle
charging/discharging cycle used in the EES system characterization, specification and testing
for a specific operating mode
EXAMPLE
a) E compatible with the total discharge, which means state of charge = 0 %;
0
b) T ≥ EES system nominal charging time;
1
c) T ≥ EES system nominal discharging time;
3
d) T + T ≤ T ;
2 4 1
e) E ≥ nominal energy capacity;
3
f) E in order to return in the state of total discharge, state of charge = 0 %.
3
Note 1 to entry: The predetermined charging/discharging cycle is obtained by the definition of the E/T values and
of the pattern of the charge and discharge phases in Figure 1.
4.2
continuous operating conditions
range of operating conditions within which the EES system is designed to operate within
specified performance limits
Note 1 to entry: The continuous operating conditions are usually defined at least as follows, but other conditions
may depend on the technology:
a) the voltage and frequency at POCs are within the continuous operating ranges;
b) the EES system is fully available;
c) the EES system is within the reference environmental conditions.
[SOURCE: IEC 61987-1:2006, 3.30, modified – The original definition has been adapted for
the EES system and the note to entry has been added.]
4.3
point of connection
POC
reference point on the electric power system where an EES system is connected
Note 1 to entry: An EES system may have several POCs arranged in two different classes: primary POC and
auxiliary POC. From an auxiliary POC it is not possible to charge electrical energy, in order to store it internally
and, finally, discharge it to the electric power system, but a primary POC can be used to feed the auxiliary
E
E
1
0
E
3

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subsystem and the control subsystem. In the absence of an auxiliary POC, the primary POC can be named simply
as POC.
Note 2 to entry: ”electric power system” is defined in IEC 60050-601:1985, 601-01-01.
[SOURCE: IEC 60050-617:2009, 617-04-01 modified – The original definition has been
adapted for the EES system and the notes to entry have been added.]
4.3.1
connection terminal
component of an EES system used for the connection to a POC
Note 1 to entry: An EES system may have several connection terminals arranged in two different classes: primary
connection terminals and auxiliary connection terminals. In the absence of an auxiliary POC, the primary
connection terminal can be named simply as connection terminal.
4.4
primary POC
point of connection where the EES system charges electrical energy from the electric power
system, in order to
...