SIST EN IEC 60904-7:2019

Photovoltaic devices - Part 7: Computation of the spectral mismatch correction for measurements of photovoltaic devices

This European Standard describes the procedure for correcting the spectral mismatch error introduced in the testing of a photovoltaic device, caused by the mismatch between the test spectrum and the reference spectrum (e.g. AM1.5 spectrum) and by the mismatch between the spectral responsivities (SR) of the reference device and of the device under test and therewith reduce the systematic uncertainty. This procedure is valid for single-junction devices but the principle may be extended to cover multi-junction devices. The purpose of this document is to give guidelines for the correction of the spectral mismatch error, should there be a spectral mismatch between the test spectrum and the reference spectrum as well as between the reference device SR and the device under test SR. The calculated spectral mismatch correction is only valid for the specific combination of test and reference devices measured with a particular test spectrum. Since a PV device has a wavelength-dependent spectral responsivity, its performance is significantly affected by the spectral distribution of the incident radiation, which in natural sunlight varies with several factors such as location, weather, time of year, time of day, orientation of the receiving surface, etc., and with a solar simulator varies with its type and conditions. If the irradiance is measured with a thermopile-type radiometer (that is not spectrally selective) or with a PV reference device (IEC 60904-2), the spectral irradiance distribution of the incoming light must be known to make the necessary corrections to obtain the performance of the PV device under the reference spectral irradiance distribution defined in IEC 60904-3. If a reference PV device or a thermopile type detector is used to measure the irradiance, then, following the procedure given in this document, it is possible to calculate the spectral mismatch correction necessary to obtain the short-circuit current of the device under test under the reference spectral irradiance distribution in IEC 60904-3 or any other reference spectrum. If the reference PV device has the same relative spectral responsivity as the device under test then the reference device automatically takes into account deviations of the measured spectral irradiance distribution from the reference spectral irradiance distribution, and no further correction of spectral mismatch errors is necessary. In this case, location and weather conditions are not critical when the reference device method is used for performance measurements under natural sunlight. Also, for identical relative SRs, the spectral classification of the simulator is not critical for measurements with solar simulators. If the performance of a PV device is measured using a known spectral irradiance distribution, its short-circuit current at any other spectral irradiance distribution can be computed using the spectral responsivity of the PV device under test.

Photovoltaische Einrichtungen - Teil 7: Berechnung der spektralen Fehlanpassungskorrektur für Messungen an photovoltaischen Einrichtungen

Dispositifs photovoltaïques - Partie 7: Calcul de la correction de désadaptation des réponses spectrales dans les mesures de dispositifs photovoltaïques

IEC 60904-7:2019 est disponible sous forme de IEC 60904-7:2019 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.

L'IEC 60904-7:2019 décrit la procédure pour corriger l'erreur de mesure spectrale introduite dans l'essai d'un dispositif photovoltaïque, due d'une part à la désadaptation du spectre pour l'essai et du spectre de référence (par exemple, spectre AM1.5), et d'autre part à la désadaptation entre les sensibilités spectrales (SS) du dispositif de référence et du dispositif soumis à essai, et ainsi réduire l'incertitude systématique. Cette procédure est valable pour les dispositifs à jonction unique, mais le principe peut être étendu aux dispositifs multijonctions. Le but du présent document est de donner des lignes directrices pour la correction de l'erreur de mesure spectrale se traduisant par une désadaptation à la fois du spectre pour l'essai et du spectre de référence, ainsi que des sensibilités spectrales (SS) du dispositif de référence et celles du dispositif soumis à essai. La correction calculée de désadaptation des réponses spectrales n'est valable que pour la combinaison spécifique des dispositifs d'essai et de référence mesurés à l'aide d'un spectre d'essai particulier. La Norme internationale IEC 60904-7 a été établie par le comité d'études 82 de l'IEC: Systèmes de conversion photovoltaïque de l'énergie solaire. Les modifications techniques principales par rapport à l'édition précédente sont les suivantes:
- pour davantage de compatibilité et moins de redondance, l'article "Détermination du spectre pour l'essai" fait référence à l'IEC 60904-9;
- le facteur de désadaptation des réponses spectrales est appelé SMM plutôt que MM afin de permettre la différenciation avec le facteur de désadaptation angulaire AMM et le facteur de désadaptation angulaire spectral SAMM;
- les formules correspondant à la dérivée et à l'application du facteur de désadaptation spectral SMM sont ajoutées;
- des références à de nouvelles normes sont données, par exemple concernant les dispositifs multijonctions;
- des formulations ont été corrigées ("sensibilité" remplace "réponse" et "éclairement" remplace "intensité").

Fotonapetostne naprave - 7. del: Izračunavanje napake zaradi spektralnega neujemanja pri preskušanju fotonapetostnih naprav

Ta evropski standard opisuje postopke za odpravljanje napake zaradi spektralnega neujemanja pri preskušanju fotonapetostne naprave, ki jo povzroči neujemanje preskusnega in referenčnega spektra (npr. spektra AM1.5) ter neujemanje spektralne odzivnosti (SR) referenčne naprave in naprave, ki se preskuša, s čimer se zmanjša sistematična negotovost. Ta postopek velja za naprave z enim spojem, vendar se načelo lahko razširi tudi na naprave z več spoji. Namen tega dokumenta je podati smernice za odpravljanje napake zaradi spektralnega neujemanja v primeru spektralnega neujemanja preskusnega in referenčnega spektra ter neujemanja spektralne odzivnosti referenčne naprave in naprave, ki se preskuša. Izračunana napaka zaradi spektralnega neujemanja velja samo za specifično kombinacijo preskusne in referenčne naprave, ki je izmerjena z določenim preskusnim spektrom. Spektralna odzivnost fotonapetostne naprave je odvisna od valovne dolžine, zato na njeno delovanje pomembno vpliva spektralna porazdelitev vpadajočega sevanja, ki se pod naravno sončno svetlobo spreminja glede na več dejavnikov (npr. glede na lokacijo, vreme, letni čas, čas v dnevu, usmerjenost sprejemne površine itd.), pri uporabi sončnega simulatorja pa glede na vrsto in pogoje. Če je sevanje izmerjeno z radiometrom s termobaterijo (ki ni spektralno selektiven) ali referenčno fotonapetostno napravo (IEC 60904-2), je treba poznati spektralno porazdelitev sevanja vhodne svetlobe, da se lahko izvedejo potrebni popravki za doseganje ustreznega delovanja fotonapetostne naprave v okviru referenčne spektralne porazdelitve sevanja, opredeljene v standardu IEC 60904-3. Če se za merjenje sevanja uporablja fotonapetostna naprava ali detektor s termobaterijo, je mogoče z upoštevanjem postopka v tem dokumentu izračunati napako zaradi spektralnega neujemanja, ki jo je treba odpraviti, da se doseže kratkostični tok naprave, ki se preskuša, v okviru referenčne spektralne porazdelitve sevanja iz standarda IEC 60904-3 oziroma katerega koli drugega referenčnega spektra. Če je relativni spektralni odziv referenčne fotonapetostne naprave enak relativnemu spektralnemu odzivu naprave, ki se preskuša, referenčna naprava samodejno upošteva odklone izmerjene spektralne porazdelitve sevanja od referenčne spektralne porazdelitve sevanja in nadaljnji popravki napak zaradi spektralnega neujemanja niso več potrebni. Lokacija in vremenske razmere v tem primeru niso odločilnega pomena, kadar se metoda z referenčno napravo uporablja za meritve delovanja pod naravno sončno svetlobo. Pri identičnih relativnih spektralnih odzivnostih spektralna klasifikacija simulatorja prav tako ni odločilnega pomena za meritve, izvedene s sončnim simulatorjem. Če je delovanje fotonapetostne naprave izmerjeno z uporabo znane spektralne porazdelitve sevanja, je mogoče njen kratkostični tok pri kateri koli drugi spektralni porazdelitvi sevanja izmeriti z uporabo spektralne odzivnosti fotonapetostne naprave, ki se preskuša.

General Information

• Status: Published
• Publication Date: 19-Nov-2019
• ICS: 27.160 - Solar energy engineering
• Technical Committee: PVS - Solar photovoltaic energy systems
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 12-Nov-2019
• Due Date: 17-Jan-2020
• Completion Date: 20-Nov-2019
• Ref Project: EN IEC 60904-7:2019 - Photovoltaic devices - Part 7: Computation of the spectral mismatch correction for measurements of photovoltaic devices

Relations

• Replaces: SIST EN 60904-7:2009 - Photovoltaic devices -- Part 7: Computation of the spectral mismatch correction for measurements of photovoltaic devices
• Effective Date: 01-Dec-2019

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 60904-7:2019
01-december-2019
Nadomešča:
SIST EN 60904-7:2009
Fotonapetostne naprave - 7. del: Izračunavanje napake zaradi spektralnega
neujemanja pri preskušanju fotonapetostnih naprav
Photovoltaic devices - Part 7: Computation of the spectral mismatch correction for
measurements of photovoltaic devices
Photovoltaische Einrichtungen - Teil 7: Berechnung der spektralen
Fehlanpassungskorrektur für Messungen an photovoltaischen Einrichtungen
Dispositifs photovoltaïques - Partie 7: Calcul de la correction de désadaptation des
réponses spectrales dans les mesures de dispositifs photovoltaïques
Ta slovenski standard je istoveten z: EN IEC 60904-7:2019
ICS:
27.160 Sončna energija Solar energy engineering
SIST EN IEC 60904-7:2019 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 60904-7:2019

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SIST EN IEC 60904-7:2019


EUROPEAN STANDARD EN IEC 60904-7

NORME EUROPÉENNE

EUROPÄISCHE NORM
October 2019
ICS 27.160 Supersedes EN 60904-7:2009 and all of its amendments
and corrigenda (if any)
English Version
Photovoltaic devices - Part 7: Computation of the spectral
mismatch correction for measurements of photovoltaic devices
(IEC 60904-7:2019)
Dispositifs photovoltaïques - Partie 7: Calcul de la Photovoltaische Einrichtungen - Teil 7: Berechnung der
correction de désadaptation des réponses spectrales dans spektralen Fehlanpassungskorrektur für Messungen an
les mesures de dispositifs photovoltaïques photovoltaischen Einrichtungen
(IEC 60904-7:2019) (IEC 60904-7:2019)
This European Standard was approved by CENELEC on 2019-09-24. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, 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
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 60904-7:2019 E

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SIST EN IEC 60904-7:2019
EN IEC 60904-7:2019 (E)
European foreword
The text of document 82/1590/FDIS, future edition 4 of IEC 60904-7, prepared by IEC/TC 82 "Solar
photovoltaic energy systems" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 60904-7:2019.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-06-24
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-09-24
document have to be withdrawn

This document supersedes EN 60904-7:2009 and all of its amendments and corrigenda (if any).
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 60904-7:2019 was approved by CENELEC as a European
Standard without any modification.


2

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SIST EN IEC 60904-7:2019
EN IEC 60904-7:2019 (E)
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where 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 60891 -  Photovoltaic devices - Procedures for temperature EN 60891 -
and irradiance corrections to measured I-V
characteristics
IEC 60904-1 -  Photovoltaic devices - Part 1: Measurement of EN 60904-1 -
photovoltaic current-voltage characteristics
IEC 60904-1-1 -  Photovoltaic devices - Part 1-1: Measurement of EN 60904-1-1 -
current-voltage characteristics of multi-junction
photovoltaic (PV) devices
IEC 60904-2 -  Photovoltaic devices - Part 2: Requirements for EN 60904-2 -
photovoltaic reference devices
IEC 60904-3 -  Photovoltaic devices - Part 3: Measurement EN IEC 60904-3 -
principles for terrestrial photovoltaic (PV) solar
devices with reference spectral irradiance data
IEC 60904-8 -  Photovoltaic devices - Part 8: Measurement of EN 60904-8 -
spectral responsivity of a photovoltaic (PV) device
IEC 60904-8-1 -  Photovoltaic devices - Part 8-1: Measurement of EN 60904-8-1 -
spectral responsivity of multi-junction photovoltaic
(PV) devices
IEC 60904-9 -  Photovoltaic devices - Part 9: Solar simulator EN 60904-9 -
performance requirements
IEC/TS 61836 -  Solar photovoltaic energy systems - Terms, - -
definitions and symbols
ISO 9288 -  Welding consumables - Solid wire electrodes, solid EN ISO 9288 1996
wires and rods for fusion welding of magnesium and
magnesium alloys - Classification

3

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SIST EN IEC 60904-7:2019

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SIST EN IEC 60904-7:2019



IEC 60904-7

®


Edition 4.0 2019-08




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Photovoltaic devices –

Part 7: Computation of the spectral mismatch correction for measurements of

photovoltaic devices




Dispositifs photovoltaïques –

Partie 7: Calcul de la correction de désadaptation des réponses spectrales dans


les mesures de dispositifs photovoltaïques













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 27.160 ISBN 978-2-8322-7219-0




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 IEC 60904-7:2019
– 2 – IEC 60904-7:2019 © IEC 2019
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Description of method . 6
5 Determination of spectral responsivity . 8
6 Determination of test spectrum . 8
7 Determination of the spectral mismatch factor . 8
7.1 General . 8
7.2 Simplified formula for a thermopile detector (pyranometer) . 10
8 Report . 10

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SIST EN IEC 60904-7:2019
IEC 60904-7:2019 © IEC 2019 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

PHOTOVOLTAIC DEVICES –

Part 7: Computation of the spectral mismatch correction
for measurements of photovoltaic devices

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 60904-7 has been prepared by IEC technical committee 82: Solar
photovoltaic energy systems.
This fourth edition cancels and replaces the third edition published in 2008. It constitutes a
technical revision.
The main technical changes with respect to the previous edition are as follows:
• For better compatibility and less redundancy, the clause “Determination of test spectrum”
refers to IEC 60904-9.
• The spectral mismatch factor is called SMM instead of MM to enable differentiation to the
angular mismatch factor AMM and spectral angular mismatch factor SAMM.
• Formulae for the derivation and application of the spectral mismatch factor SMM are
added.
• Links to new standards are given, e.g. concerning multi-junction devices.

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SIST EN IEC 60904-7:2019
– 4 – IEC 60904-7:2019 © IEC 2019
• Corrected wording (responsivity instead of response and irradiance instead of intensity).
The text of this International Standard is based on the following documents:
FDIS Report on voting
82/1590/FDIS 82/1605/RVD

Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of IEC 60904 series, published under the general title Photovoltaic devices,
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 "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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SIST EN IEC 60904-7:2019
IEC 60904-7:2019 © IEC 2019 – 5 –
PHOTOVOLTAIC DEVICES –

Part 7: Computation of the spectral mismatch correction
for measurements of photovoltaic devices



1 Scope
This part of IEC 60904 describes the procedure for correcting the spectral mismatch error
introduced in the testing of a photovoltaic device, caused by the mismatch between the test
spectrum and the reference spectrum (e.g. AM1.5 spectrum) and by the mismatch between
the spectral responsivities (SR) of the reference device and of the device under test and
therewith reduce the systematic uncertainty. This procedure is valid for single-junction
devices but the principle may be extended to cover multi-junction devices.
The purpose of this document is to give guidelines for the correction of the spectral mismatch
error, should there be a spectral mismatch between the test spectrum and the reference
spectrum as well as between the reference device SR and the device under test SR. The
calculated spectral mismatch correction is only valid for the specific combination of test and
reference devices measured with a particular test spectrum.
Since a PV device has a wavelength-dependent spectral responsivity, its performance is
significantly affected by the spectral distribution of the incident radiation, which in natural
sunlight varies with several factors such as location, weather, time of year, time of day,
orientation of the receiving surface, etc., and with a solar simulator varies with its type and
conditions. If the irradiance is measured with a thermopile-type radiometer (that is not
spectrally selective) or with a PV reference device (IEC 60904-2), the spectral irradiance
distribution of the incoming light must be known to make the necessary corrections to obtain
the performance of the PV device under the reference spectral irradiance distribution defined
in IEC 60904-3.
If a reference PV device or a thermopile type detector is used to measure the irradiance, then,
following the procedure given in this docum
...