IEC 61829:2015

Photovoltaic (PV) array - On-site measurement of current-voltage characteristics

IEC 61829:2015 specifies procedures for on-site measurement of flat-plate photovoltaic (PV) array characteristics, the accompanying meteorological conditions, and use of these for translating to standard test conditions (STC) or other selected conditions. This new edition includes the following significant technical changes with respect to the previous edition:
- it addresses many outdated procedures;
- it accommodates commonly used commercial I-V curve tracers;
- it provides a more practical approach for addressing field uncertainties;
- it removes and replaces procedures with references to other updated and pertinent standards, including the IEC 60904 series, andIEC 60891.

Champ de modules photovoltaïques (PV) - Mesurage sur site des caractéristiques courant-tension

L'IEC 61829:2015 spécifie les procédures relatives au mesurage sur site des caractéristiques d'un champ de modules photovoltaïques (PV) à plaque plane avec les conditions climatiques associées et l'utilisation de celles-ci pour leur transposition dans des conditions normales d'essai (STC - standard test conditions) ou dans d'autres conditions sélectionnées. Cette nouvelle édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- elle traite de plusieurs procédures obsolètes;
- elle tient compte des traceurs de courbe I-V commerciaux couramment utilisés;
- elle fournit une approche plus pratique pour gérer les incertitudes associées aux champs;
- elle supprime et remplace certaines procédures par d'autres normes pertinentes et mises à jour, parmi lesquelles la série IEC 60904 et l'IEC 60891.

General Information

• Status: Published
• Publication Date: 21-Oct-2015
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 27.160 - Solar energy engineering
• Technical Committee: TC 82 - Solar photovoltaic energy systems
• Drafting Committee: WG 3 - TC 82/WG 3
• Current Stage: PPUB - Publication issued
• Start Date: 15-Nov-2015
• Completion Date: 22-Oct-2015

Standards Content (Sample)

IEC 61829 ®
Edition 2.0 2015-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Photovoltaic (PV) array – On-site measurement of current-voltage characteristics

Champ de modules photovoltaïques (PV) – Mesurage sur site des caractéristiques
courant-tension
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IEC 61829 ®
Edition 2.0 2015-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Photovoltaic (PV) array – On-site measurement of current-voltage characteristics

Champ de modules photovoltaïques (PV) – Mesurage sur site des caractéristiques

courant-tension
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.160 ISBN 978-2-8322-2966-8

– 2 – IEC 61829:2015 © IEC 2015
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Apparatus . 7
4.1 Irradiance measurements in natural sunlight . 7
4.2 Module temperature measurements . 8
4.3 Electrical measurements . 8
5 Measurement procedure . 9
5.1 Choose and record appropriate conditions for measurement . 9
5.2 Clean the modules . 9
5.3 Check for shading . 9
5.4 Confirm uniformity of irradiance over the test array . 10
5.5 Mount the reference device . 10
5.6 Prepare to measure the array temperature . 10
5.7 Disconnect the array . 11
5.8 Connect the measurement system to the array to be measured . 11
5.9 Record electrical data and measurement conditions . 11
5.10 Record spectral data . 12
5.11 Typical and extreme module selection . 12
6 Analysis . 13
6.1 Adjust the measured irradiance for any deviation from reference conditions . 13
6.2 Compute the average temperature of the array under test . 13
6.3 Compute the junction temperature . 14
6.4 Translate the measurement to the desired test condition . 14
6.5 Correct for soiling losses . 14
7 Test report . 14
Annex A (informative) Reference values and reference device . 16
A.1 Reference test conditions (RTC) . 16
A.2 Standard test conditions (STC) . 16
A.3 Reference device . 16
Bibliography . 17

Figure 1 – Examples of extreme and central modules . 13

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PHOTOVOLTAIC (PV) ARRAY –
ON-SITE MEASUREMENT OF CURRENT-VOLTAGE CHARACTERISTICS

FOREWORD
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International Standard IEC 61829 has been prepared by IEC technical committee 82: Solar
photovoltaic energy systems.
This second edition cancels and replaces the first edition published in 1995. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) it addresses many outdated procedures;
b) it accommodates commonly used commercial I-V curve tracers;
c) it provides a more practical approach for addressing field uncertainties;
d) it removes and replaces procedures with references to other updated and pertinent
standards, including the IEC 60904 series, and IEC 60891.
...