SIST EN 62116:2011
(Main)Test procedure of islanding prevention measures for utility - interconnected photovoltaic inverters
Test procedure of islanding prevention measures for utility - interconnected photovoltaic inverters
IEC 62116:2008 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.
Prüfverfahren für Maßnahmen zur Verhinderung der Inselbildung für Versorgungsunternehmen in Wechselwirkung mit Photovoltaik - Wechselrichtern
Procédure d'essai des mesures de prévention contre l'ilotage pour onduleurs photovoltaïques interconnectés au réseau public
La CEI 62116:2008 décrit des lignes directrices pour les essais de performance des mesures de prévention contre l'îlotage automatique installées dans ou avec des onduleurs PV interactifs avec le réseau public monophasés ou multiphasés, connectés au réseau public d'électricité. La procédure et les critères d'essai décrits sont les exigences minimales qui permettent la répétabilité. Des exigences supplémentaires ou des critères plus sévères peuvent être spécifiés si l'on peut démontrer l'existence de risque. Les onduleurs et autres dispositifs satisfaisant aux exigences de cette norme sont considérés comme étant sans îlotage, comme cela est défini dans la CEI 61727.
Preskusni postopki za ukrepe proti otočnemu delovanju fotonapetostnih razsmernikov, povezanih na omrežje (IEC 62116:2008, spremenjen)
Namen tega evropskega standarda je zagotoviti preskusni postopek za ovrednotenje učinka ukrepov proti otočnemu delovanju, ki se uporabljajo s fotonapetostnimi razsmerniki, povezanimi na omrežje. Ta standard ne določa nastavitvenih parametrov (napetosti in velikosti frekvenčnega preklopa ter časa preklopa) in meril za uspešnost/neuspešnost, ker je treba za to upoštevati EN 50438 in/ali nacionalne standarde in/ali pravilnike.
Ta standard opisuje smernico za preskušanje učinkovitosti avtomatskih ukrepov proti otočnemu delovanju, nameščenih v eno- ali večfaznih interaktivnih fotonapetostnih razsmernikih, povezanih na omrežje, ali skupaj z njimi. Opisani preskusni postopki in merila so minimalne zahteve, ki omogočajo ponovljivost. Dodatne zahteve ali ostrejša merila se lahko določijo, če se pokaže dokazljivo tveganje. Za razsmernike in druge pripomočke, ki izpolnjujejo zahteve tega standarda, velja, da nimajo otočnega delovanja, kot je opredeljeno v CLC/TS 61836.
Ta standard lahko velja za druge vrste sistemov, povezanih na omrežje (npr. mikroturbinske in gorivne celice na osnovi razsmernikov, indukcijske in sinhrone stroje). Za druge fotonapetostne sisteme, ki ne temeljijo na razsmernikih, je lahko potreben tehnični pregled.
Nacionalni standardi in/ali pravilniki lahko omogočajo alternativne preskusne postopke za vrednotenje učinkovitosti ukrepov proti otočnemu delovanju.
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-2011
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Test procedure of islanding prevention measures for utility - interconnected photovoltaic
inverters
Prüfverfahren für Maßnahmen zur Verhinderung der Inselbildung für
Versorgungsunternehmen in Wechselwirkung mit Photovoltaik - Wechselrichtern
Procédure d'essai des mesures de prévention contre l'ilotage pour onduleurs
photovoltaïques interconnectés au réseau public
Ta slovenski standard je istoveten z: EN 62116:2011
ICS:
27.160 6RQþQDHQHUJLMD Solar energy engineering
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 62116
NORME EUROPÉENNE
March 2011
EUROPÄISCHE NORM
ICS 27.160
English version
Test procedure of islanding prevention measures for utility-
interconnected photovoltaic inverters
(IEC 62116:2008, modified)
Procédure d'essai des mesures de Prüfverfahren für Maßnahmen zur
prévention contre l'ilotage pour onduleurs Verhinderung der Inselbildung für
photovoltaïques interconnectés au réseau Versorgungsunternehmen in
public Wechselwirkung mit Photovoltaik-
(CEI 62116:2008, modifiée) Wechselrichtern
(IEC 62116:2008, modifiziert)
This European Standard was approved by CENELEC on 2011-01-02. 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 Central Secretariat 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 Central Secretariat 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62116:2011 E
Foreword
This European Standard consists of the text of the International Standard IEC 62116:2008
together with common modifications prepared by the Technical Committee CENELEC TC 82,
Solar photovoltaic energy systems.
The text of the draft was submitted to the formal vote (see BT decision D136/C054) and was
accepted by CENELEC as EN 62116 on 2011-01-02.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2012-01-02
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2014-01-02
This European Standard consists of IEC 62116:2008 with some common modifications that
have been developed within CLC/TC 82 and are identified in red and/or by a vertical line in
the left margin of the text.
The scope of the common modifications is to add more detailed information on the application
of the test procedure of islanding prevention measures.
__________
– 3 – EN 62116:2011
Contents
Introduction . 4
1 Scope and object . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Testing circuit . 7
5 Testing equipment . 8
5.1 Measuring instruments . 8
5.2 DC power source . 8
5.2.1 PV array simulator . 9
5.2.2 PV array . 9
5.2.3 Current and voltage limited DC power supply with series resistance . 9
5.3 AC power source . 10
5.4 AC loads . 10
6 Test for single or multi-phase inverter . 10
6.1 Test procedure. 10
6.2 Pass/fail criteria . 13
7 Documentation . 14
Annex A (informative) Islanding as it applies to PV systems. 17
Annex B (informative) Test for independent islanding detection device (relay) . 19
Annex C (informative) Gate blocking signal . 21
Bibliography . 22
Figure 1 – Test circuit for islanding detection function in a power conditioner (inverter) .8
Figure B.1 – Test circuit for independent islanding detection device (relay) . 19
Table 1 – Parameters to be measured in real time .7
Table 2 – Specification of array simulator (test conditions).9
Table 3 – PV array test conditions .9
Table 4 – AC power source requirements . 10
Table 5 – Test conditions . . 11
Table 6 – Load imbalance (active, reactive load) for test condition A . 13
Table 7 – Load imbalance (reactive load) for test condition B (EUT output = 50 % – 66 %)
and test condition C (EUT output = 25 % – 33 %) . 13
Table 8 – Specification of the EUT provided by manufacturer (example) . 14
Table 9 – List of tested condition and run on time (example) . 15
Table 10 – Specification of testing equipment (example) . 16
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 with
which electric power providers (utilities) must regularly contend. 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 line-workers and network users who think the lines and their equipment 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 efficiency of these anti-islanding techniques; that procedure is the subject of
this document.
This standard provides a consensus test procedure to evaluate the efficiency 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.
– 5 – EN 62116:2011
1 Scope and object
The purpose of this European Standard is to provide a test procedure to evaluate the
performance of islanding prevention measures used with utility-interconnected PV systems.
This standard does not specify settings parameters (voltage and frequency trip magnitude and
trip time) nor pass/fail criteria, because the EN 50438 and/or National standards and/or grid
codes should be taken into account for this purpose.
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 CLC/TS 61836.
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.
Alternative testing procedures to evaluate the performance of islanding prevention may be
allowed by national standards and/or grid codes.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition citied applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
EN 61727, Photovoltaic (PV) systems – Characteristics of the utility interface (IEC 61727)
CLC/TS 61836, Solar photovoltaic energy systems – Terms, definitions and symbols
(IEC/TS 61836)
EN 50438, Requirements for the connection of micro-generators in parallel with public low-
voltage distribution networks
3 Terms and definitions
For the purposes of this document, the terms and definitions of CLC/TS 61836 apply as well
as the following.
3.1
PV array simulator
DC power source used to simulate PV array output
3.2
EUT (Equipment Under Test)
EUT indicates the inverter or anti-islanding device on which these tests are performed
3.3
MPPT (Maximum Power Point Tracking)
MPPT is a PV array control strategy used to maximize the output of the system under the
prevailing conditions
3.4
island
a state in which a portion of the electric utility grid, containing load and generation, continues
to operate isolated from the rest of the grid. The generation and loads may be any
combination of customer-owned and utility-owned.
3.5
intentional island
an island that is intentionally created, usually to restore or maintain power to a section of the
utility grid affected by a fault. 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.
3.6
quality factor, Q
f
a measure of the strength of resonance of the islanding test load.
NOTE 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
...
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