SIST EN 62116:2014

SLOVENSKI STANDARD
SIST EN 62116:2014
01-oktober-2014
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SIST EN 62116:2011
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Utility-interconnected photovoltaic inverters - Test procedure of islanding prevention
measures
Procédure d'essai des mesures de prévention contre l'ilotage pour onduleurs
photovoltaïques interconnectés au réseau public
Ta slovenski standard je istoveten z: EN 62116:2014
ICS:
27.160 6RQþQDHQHUJLMD Solar energy engineering
SIST EN 62116:2014 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 62116:2014

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SIST EN 62116:2014


EUROPEAN STANDARD EN 62116

NORME EUROPÉENNE

EUROPÄISCHE NORM
July 2014
ICS 27.160 Supersedes EN 62116:2011
English Version
Utility-interconnected photovoltaic inverters - Test procedure of
islanding prevention measures
(IEC 62116:2014)
Onduleurs photovoltaïques interconnectés au réseau public Photovoltaik-Wechselrichter für den Anschluss an das
- Procédure d'essai des mesures de prévention contre Stromversorgungsnetz - Prüfverfahren für Maßnahmen zur
l'îlotage Verhinderung der Inselbildung
(CEI 62116:2014) (IEC 62116:2014)
This European Standard was approved by CENELEC on 2014-04-02. 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
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 62116:2014 E

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SIST EN 62116:2014
EN 62116:2014 - 2 -
Foreword
The text of document 82/813/FDIS, future edition 2 of IEC 62116, prepared by IEC/TC 82 "Solar
photovoltaic energy systems" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN 62116:2014.
The following dates are fixed:
– latest date by which the document has to be implemented at (dop) 2015-01-25
national level by publication of an identical national
standard or by endorsement
– latest date by which the national standards conflicting with (dow) 2017-04-02
the document have to be withdrawn
This document supersedes EN 62116:2011.
EN 62116:2014 includes the following significant technical changes with respect to EN 62116:2011:
Previous edition Present edition
3.7
5.1
5.4
6.1 b)
6.1 d)
6.1 e) Real power Active power
6.1 g)
Table 1
Table 6
Table 7
Table 9
A DC power source, such as a PV array
A PV array or PV array simulator (preferred) simulator, a PV array, or a current and voltage
may be used. limited DC power supply with series resistance
may be used.
If the EUT can operate in utility-interconnected
mode from a storage battery, a DC power If the EUT can operate in utility-interconnected
5.2
source may be used in lieu of a battery as long mode from a storage battery, a DC power
as the DC power source is not the limiting source may be used in lieu of a battery as long
device as far as the maximum EUT input as the DC power source shall not be the limiting
current is concerned. device as far as the maximum EUT input
current is concerned.

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SIST EN 62116:2014
- 3 - EN 62116:2014
EUT input voltage 90 % EUT input voltage 75 %
EUT input voltage 10 % EUT input voltage 20 %
Table 5
EUT Trip Settings Manufacturer specified Voltage and frequency trip settings according to
voltage and frequency trip settings National standards and/or local code
Tables 6 & Percent change in real load, reactive load from Percent change in active load, reactive load
7 (Heading) nominal from nominal output power

Major changes with respect to the previous edition concern the DC power source and test conditions.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 62116:2014 was approved by CENELEC as a European
Standard without any modification.

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SIST EN 62116:2014
EN 62116:2014 - 4 -
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1  When an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC/TS 61836 -  Solar photovoltaic energy systems - CLC/TS 61836 -
Terms, definitions and symbols

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SIST EN 62116:2014




IEC 62116

®


Edition 2.0 2014-02




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE
colour

inside










Utility-interconnected photovoltaic inverters – Test procedure of islanding

prevention measures




Onduleurs photovoltaïques interconnectés au réseau public – Procédure

d’essai des mesures de prévention contre l’îlotage
















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX U


ICS 27.160 ISBN 978-2-8322-1442-8



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN 62116:2014
– 2 – IEC 62116:2014 © IEC 2014
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Testing circuit . 9
5 Testing equipment . 11
5.1 Measuring instruments . 11
5.2 DC power source . 11
5.2.1 General . 11
5.2.2 PV array simulator . 12
5.2.3 Current and voltage limited DC power supply with series
resistance . 12
5.2.4 PV array . 12
5.3 AC power source . 13
5.4 AC loads . 13
6 Test for single or multi-phase inverter . 13
6.1 Test procedure . 13
6.2 Pass/fail criteria . 17
7 Documentation . 17
Annex A (informative) Islanding as it applies to PV systems . 20
A.1 General . 20
A.2 Impact of distortion on islanding . 21
Annex B (informative) Test for independent islanding detection device (relay) . 22
B.1 General . 22
B.2 Testing circuit . 22
B.3 Testing equipment . 22
B.3.1 General . 22
B.3.2 AC input source . 22
B.4 Testing procedure . 23
B.5 Documentation . 23
Annex C (informative) Gate blocking signal . 24
C.1 General . 24
C.2 Gate blocking signal used in photovoltaic systems . 24
C.3 Monitoring the gate blocking signal . 24
Bibliography . 25

Figure 1 – Test circuit for islanding detection function in a power conditioner (inverter) . 11
Figure B.1 – Test circuit for independent islanding detection device (relay) . 22

Table 1 – Parameters to be measured in real time . 10
Table 2 – Specification of array simulator (test conditions). 12
Table 3 – PV array test conditions . 13
Table 4 – AC power source requirements . 13
Table 5 – Test conditions . 14

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SIST EN 62116:2014
IEC 62116:2014 © IEC 2014 – 3 –
Table 6 – Load imbalance (real, reactive load) for test condition A (EUT output =
100 %) . 16
Table 7 – Load imbalance (reactive load) for test condition B (EUT output = 50 % to
66 %) and test condition C (EUT output = 25 % to 33 %) . 16
Table 8 – Specification of the EUT provided by the manufacturer (example) . 17
Table 9 – List of tested condition and run on time (example) . 18
Table 10 – Specification of testing equipment (example) . 19

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SIST EN 62116:2014
– 4 – IEC 62116:2014 © IEC 2014
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

UTILITY-INTERCONNECTED PHOTOVOLTAIC INVERTERS – TEST
PROCEDURE OF ISLANDING PREVENTION MEASURES

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 62116 has been prepared by IEC technical committee 82: Solar
photovoltaic energy systems.
This second edition cancels and replaces the first edition issued in 2008 and constitutes a
technical revision.
The main technical changes with regard to the previous edition are as follows:

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SIST EN 62116:2014
IEC 62116:2014 © IEC 2014 – 5 –
Previous edition Present edition
Clause
3.7
5.1
5.4
6.1 b)
6.1 d)
Real power Active power
6.1 e)
6.1 g)
Table 1
Table 6
Table 7
Table 9
A PV array or PV array simulator (preferred) A DC power source, such as a PV array
may be used. simulator, a PV array, or a current and voltage
If the EUT can operate in utility-interconnected limited DC power supply with series resistance
mode from a storage battery, a DC power may be used.
source may be used in lieu of a battery as long If the EUT can operate in utility-interconnected
5.2
as the DC power source is not the limiting mode from a storage battery, a DC power
device as far as the maximum EUT input source may be used in lieu of a battery as long
current is concerned. as the DC power source shall not be the
limiting device as far as the maximum EUT
input current is concerned.
EUT input voltage 90 % EUT input voltage 75 %
EUT input voltage 10 % EUT input voltage 20 %
Table 5
EUT Trip Settings Manufacturer specified Voltage and frequency trip settings according
voltage and frequency trip settings to National standards and/or local code
Tables 6 &
Percent change in real load, reactive load from Percent change in active load, reactive load
7
nominal from nominal output power
(Heading)

The text of this standard is based on the following documents:
FDIS Report on voting
82/813/FDIS 82/827/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.
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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SIST EN 62116:2014
– 6 – IEC 62116:2014 © IEC 2014
INTRODUCTION
Islanding is a condition in which a portion of an electric power grid, containing both load and
generation, is isolated from the remainder of the electric power grid. This situation is one
which electric power providers (utilities) regularly contend with. When an island is created
purposely by the controlling utility – to isolate large sections of the utility grid, for example – it
is called an intentional island. Conversely, an unintentional island can be created when a
segment of the utility grid containing only customer-owned generation and load is isolated
from the utility control.
Normally, the customer-owned generation is required to sense the absence of utility-
controlled generation and cease energizing the grid. However, when the generation and load
within the segment are well balanced prior to the isolation event, the utility is providing little
power to the grid segment, thus making it difficult to detect when the isolation occurs.
Damage can occur to customer equipment if the generation in the island, no longer under
utility control, operates outside of normal voltage and frequency conditions. Customer and
utility equipment can be damaged if the main grid recloses into the island out of
synchronization. Energized lines within the island present a shock hazard to unsuspecting
utility lineworkers who think the lines are dead.
The PV industry has pioneered the development of islanding detection and prevention
measures. To satisfy the concerns of electric power providers, commercially-available utility-
interconnected PV inverters have implemented a variety of islanding detection and prevention
(also called anti-islanding) techniques. The industry has also developed a test procedure to
demonstrate the efficacy of these anti-islanding techniques; that procedure is the subject of
this document.
This standard provides a consensus test procedure to evaluate the efficacy of islanding
prevention measures used by the power conditioner of utility-interconnected PV systems.
Note that while this document specifically addresses inverters for photovoltaic systems, with
some modifications the setup and procedure may also be used to evaluate inverters used with
other generation sources or to evaluate separate anti-islanding devices intended for use in
conjunction with PV inverters or other generation sources acting as or supplementing the anti-
islanding feature of those sources.
Inverters and other devices meeting the requirements of this document can be considered
non-islanding, meaning that under reasonable conditions, the device will detect island
conditions and cease to energize the public electric power grid.

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SIST EN 62116:2014
IEC 62116:2014 © IEC 2014 – 7 –
UTILITY-INTERCONNECTED PHOTOVOLTAIC INVERTERS – TEST
PROCEDURE OF ISLANDING PREVENTION MEASURES



1 Scope
The purpose of this International Standard is to provide a test procedure to evaluate the
performance of islanding prevention measures used with utility-interconnected PV systems.
This standard describes a guideline for testing the performance of automatic islanding
prevention measures installed in or with single or multi-phase utility interactive PV inverters
connected to the utility grid. The test procedure and criteria described are minimum
requirements that will allow repeatability. Additional requirements or more stringent criteria
may be specified if demonstrable risk can be shown. Inverters and other devices meeting the
requirements of this standard are considered non-islanding as defined in IEC 61727.
This standard may be applied to other types of utility-interconnected systems (e.g. inverter-
based microturbine and fuel cells, induction and synchronous machines). However, technical
review may be necessary for other than inverter-based PV systems.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC/TS 61836, Solar photovoltaic energy systems – Terms, definitions and symbols
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61836 as well as
the following apply.
3.1
PV array simulator
DC power source used to simulate PV array output
3.2
EUT
equipment under test
inverter or anti-islanding device on which these tests are performed
Note 1 to entry: This note applies to the French language only.
3.3
MPPT
maximum power point tracking
PV array control strategy used to maximize the output of the system under the prevailing
conditions
Note 1 to entry: This note applies to the French language only.

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SIST EN 62116:2014
– 8 – IEC 62116:2014 © IEC 2014
3.4
non-islanding inverter
inverter that will cease to energize a utility distribution system that is out of the nominal
operation specifications for voltage and/or frequency
[SOURCE: IEC 61727:2004, 3.8.1]
3.5
island
state in which a portion of the electric utility grid, containing load and generation, continues to
operate isolated from the rest of the grid
Note 1 to entry: The generation and loads may be any combination of customer-owned and utility-owned.
3.6
intentional island
island that is intentionally created, usually to restore or maintain power to a section of the
utility grid affected by a fault
Note 1 to entry: The generation and loads may be any combination of customer-owned and utility-owned, but there
is an implicit or explicit agreement between the controlling utility and the operators of customer-owned generation
for this situation.
3.7
quality factor
Q
f
a measure of the strength of resonance of the islanding test load
Note 1 to entry: In a parallel resonant circuit, such as a load on a power system
C
Q = R
f
L
where
Q is quality factor
f
R is effective load resistance
C is reactive load capacitance (including shunt capacitors)
L is reactive load inductance
With C and L tuned to the power system fundamental frequency, Q for the resonant circuit drawing active power, P,
f
reactive powers Q , for inductive load and Q for capacitive load, Q can be determined by
L C f
Q = (1 P) Q ⋅ Q
f L C
where
P is active power, in W
Q is inductive load, in VAr
L L
Q is capacitive load, in VAr
C C
3.8
run-on time
t
R
amount of time that an unintentional island condition exists, calculated as the interval
between the opening of the switch S1 (Figure 1) and the cessation of EUT output current

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SIST EN 62116:2014
IEC 62116:2014 © IEC 2014 – 9 –
3.9
stopping signal
signal provided by the inverter indicating it has ceased energizing its utility grid-connected
output terminals
SEE: Annex C.
3.10
unintentional island
islanding condition in which the generation within the island that is supposed to cease
energizing the utility grid instead continues to energize the utility grid
4 Testing circuit
The testing circuit shown in Figure 1 shall be employed. Similar circuits shall be used for
three-phase output.
Parameters to be measured are shown in Table 1 and Figure 1. Parameters to be recorded in
the test report are discussed in Clause 7.

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SIST EN 62116:2014
– 10 – IEC 62116:2014 © IEC 2014
Table 1 – Parameters to be measured in real time
Parameter Symbol Units
a, b
EUT DC input
DC voltage V V
DC
DC current I A
DC
DC power P W
DC
c 2
Irradiance G W/m
EUT AC output

b, d, e
AC voltage V V
EUT
b, d, e
I
AC current A
EUT
b
Active power P W
EUT
b
Reactive power Q VAr
EUT

d, e, f, g
Voltage waveform

d, e, f, g
Current waveform
d
EUT (relay) output control signal
Run-on time t s
R
h
Stopping signal SS --
b
Test load
Resistive load current I A
R
Inductive load current I A
L
Capacitive load current I A
C
AC (utility) power source
i
Utility active power P W

AC
i
Utility reactive power Q VAr
AC
i
I
Utility current A
AC
a
 If applicable.

b
Record values measured before switch S1 is opened.
c
 Recorded when the test is carried out using a PV array. Pyranometer should be fast response silicon-type
not thermopile-type.

d
The response time of voltage and current transducer shall be suitable for the sampling rate used.

e
The waveform, AC voltage and current shall be measured on all phases.
f
 The waveform data shall be recorded from the beginning of the islanding test until the EUT ceases output.
The measurement of time shall have an accuracy and resolution of better than 1 ms.
g
 When the waveform is recorded, the synchronizing signal of the S1 opening and stopping signal may be
simultaneously recorded.
h
 If available from the EUT.
i
 Signal shall be filtered as necessary to provide fundamental (50 Hz or 60 Hz) frequency value. Fundamental
values will ignore incidental harmonics, caused by utility voltage distortion, absorbed by the load and EUT
filtering capacitors.

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Trigger
SIST EN 62116:2014
IEC 62116:2014 © IEC 2014 – 11 –

Waveform
monitor
V I V I I
DC power DC DC EUT EUT AC AC power
EUT
source source
(inverter)
(PV)
(utility)
P Q S1
P
EUT EUT
DC P Q
AC AC
S2
I I I
R L C
AC loads
IEC  1567/08

Figure 1 – Test circuit for islanding detection
function in a power conditioner (inverter)
5 Testing equipment
5.1 Measuring instruments
Waveform observation shall be measured by a device with memory function, for example, a
storage or digital oscilloscope or a high speed data acquisition system. The waveform
measurement/capture device shall be able to record the waveform from the beginning of the
islanding test until the EUT ceases to energize the island. For multi-phase EUT, all phases
shall be monitored. A wa
...