IEC 60891:2009

Photovoltaic devices - Procedures for temperature and irradiance corrections to measured I-V characteristics

IEC 60891:2009 defines procedures to be followed for temperature and irradiance corrections to the measured I-V (current-voltage) characteristics of photovoltaic devices. It also defines the procedures used to determine factors relevant for these corrections. Requirements for I-V measurement of photovoltaic devices are laid down in IEC 60904-1. The main technical changes with regard the previous edition are as follows:
- extends edition 1 translation procedure to irradiance change during I-V measurement;
- adds 2 new translation procedures;
- revises procedure for determination of temperature coefficients to include PV modules;
- defines new procedure for determination of internal series resistance;
- defines new procedure for determination of curve correction factor.

Dispositifs photovoltaïques - Procédures pour les corrections en fonction de la température et de l'éclairement à appliquer aux caractéristiques I-V mesurées

La CEI 60891:2009 définit des procédures à suivre pour les corrections en fonction de la température et de l'éclairement à appliquer aux caractéristiques I-V (courant-tension) mesurées des dispositifs photovoltaïques. Elle définit également les procédures utilisées pour déterminer les facteurs appropriés pour ces corrections. Les exigences pour la mesure I-V des dispositifs photovoltaïques sont données dans la CEI 60904-1. Les principales modifications techniques par rapport à l'édition précédente sont les suivantes:
- extension de la procédure de transposition de l'édition 1 au changement d'éclairement pendant la mesure I-V;
- ajout de deux nouvelles procédures de transposition;
- révision de la procédure utilisée pour déterminer les coefficients de température pour inclure les modules PV;
- définition d'une nouvelle procédure pour déterminer la résistance-série interne;
- définition d'une nouvelle procédure pour déterminer le facteur de correction de la courbe.

General Information

• Status: Published
• Publication Date: 13-Dec-2009
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 27.160 - Solar energy engineering
• ICS: 43.120 - Electric road vehicles
• Technical Committee: TC 82 - Solar photovoltaic energy systems
• Current Stage: DELPUB - Deleted Publication
• Start Date: 29-Jun-2018
• Completion Date: 27-Oct-2021

Relations

• Revised: IEC 60891:2021 - Photovoltaic devices - Procedures for temperature and irradiance corrections to measured I-V characteristics
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60891 ®
Edition 2.0 2009-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Photovoltaic devices – Procedures for temperature and irradiance corrections to
measured I-V characteristics
Dispositifs photovoltaïques – Procédures pour les corrections en fonction de la
température et de l’éclairement à appliquer aux caractéristiques I-V mesurées

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IEC 60891 ®
Edition 2.0 2009-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Photovoltaic devices – Procedures for temperature and irradiance corrections to
measured I-V characteristics
Dispositifs photovoltaïques – Procédures pour les corrections en fonction de la
température et de l’éclairement à appliquer aux caractéristiques I-V mesurées

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
R
CODE PRIX
ICS 27.160 ISBN 978-2-88910-316-4
– 2 – 60891 © IEC:2009
CONTENTS
FOREWORD.3
1 Scope.5
2 Normative references .5
3 Correction procedures .5
3.1 General .5
3.2 Correction procedure 1.6
3.3 Correction procedure 2.7
3.4 Correction procedure 3.8
4 Determination of temperature coefficients.13
4.1 General .13
4.2 Apparatus.13
4.3 Procedure in natural sunlight.14
4.4 Procedure with a solar simulator .15
4.5 Calculation of temperature coefficients.15
5 Determination of internal series resistance R and R′ .15
S S
5.1 General .15
5.2 Correction procedure 1.16
5.3 Correction procedure 2.17
6 Determination of the curve correction factor κ and κ′ .18
6.1 General .18
6.2 Procedure .18
7 Reporting .19
Bibliography.21

Figure 1 – Example of the correction of the I-V characteristics by Equations (6) and (7) .10
Figure 2 – Schematic diagram of the relation of G and T which can be chosen in the
3 3
simultaneous correction for irradiance and temperature, for a fixed set of T , G , T ,
1 1 2
by Equations (8) and (9).11
and G
Figure 3 – Schematic diagram of the processes for correcting the I-V characteristics to
various ranges of irradiance and temperature based on three measured
characteristics .12
Figure 4 – Schematic diagram of the processes for correcting the I-V characteristics to
various ranges of irradiance and temperature based on four measured characteristics .13
Figure 5 – Positions for measuring the temperature of the test module behind the cells .14
Figure 6 – Determination of internal series resistance.16
Figure 7 – Determination of V irradiance correction factor and internal series
OC
resistance .18
Figure 8 – Determination of curve correction factor.19

60891 © IEC:2009 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PHOTOVOLTAIC DEVICES – PROCEDURES FOR TEMPERATURE AND
IRRADIANCE CORRECTIONS TO MEASURED I-V CHARACTERISTICS

FOREWORD
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International Standard IEC 60891 has been prepared by IEC technical committee 82: Solar
photovoltaic energy systems.
This second edition cancels and replaces the first edition issued in 1987 and its Amendment 1
(1992) and constitutes a technical revision.
The main technical changes with regard the previous edition are as follows:
– extends edition 1 translation procedure to irradiance change during I-V measurement;
– adds 2 new translation procedures;
– revises procedure for determination of temperature coefficients to include PV modules;
– defines new procedure for determination of internal series resistance;
– defines new procedure for determination of curve correction factor.

– 4 – 60891 © IEC:2009
The text of this standard is based on the following documents:
FDIS Report on voting
82/581/FDIS 82/588/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 maintenance result 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.
...