IEC IEC63409-3 Edition 1.02025-12 INTERNATIONAL STANDARD Photovoltaic power generating systems connection with the grid - Testing of powerconversionequipment - Part3: Basic operations IEC 63409-3:2025-12(en) ICS 27.160 ISBN 978-2-8327-0818-7 THIS PUBLICATIONIS COPYRIGHTPROTECTED Copyright@2025IEC,Geneva,Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanicai, including photocopying and microfilm, without permission in writing from either IEc or IEC's member National Committee in the country of the requester. If you have any questions about IEC copyright IEC member National Committee for further information. IEC Secretariat Tel.: +41 22 919 02 11 3, rue de Varembe [email protected] CH-1211 Geneva 20 www.iec.ch Switzerland About the IEC International Standards for all electrical, electronic and related technologies. About IEC publications The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the IECpublicationssearch- IEc Products &Services Portal-products.iec.ch webstore.iec.ch/advsearchform Discover our powerful search engine and read freely all the The advanced search enables to find IEC publications by a publications previews, graphical symbols and the glossary. variety of criteria (reference number, text, technical With a subscription you wili always have access to up to date committee, ...). It also gives information on projects, content tailored to your needs. replaced and withdrawn publications. Electropedia -www.electropedia.org IEc Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications. Just Published containing more than 22 500 terminological entries in English details all new publications released. Available online and and French, with equivalent terms in 25 additional languages. once a month by email. Also known as the International Electrotechnical Vocabulary (IEV) online. IECCustomerServiceCentre-webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre:[email protected]. Warning! Make sure that you obtained this publication from an authorized distributor. IEC63409-3:2025IEC2025 CONTENTS FOREWORD .5 INTRODUCTION 1 Scope.. 2 Normativereferences, .8 3 Terms and definitions.. .8 4 General requirements.... 4.1 General conditions for testing 11 4.1.1 Sequence of tests. 11 4.1.2 Test equipment conditions.. ..12 4.1.3 Manufacturer's stated tolerance. 4.1.4 Required setting for EUT (equipment under test) .12 4.1.5 PCE firmware used during the test. 12 4.1.6 Reporting thetest results. .12 4.2 Test setup... 12 4.3 Parameters used in the tests 13 5 Test procedures ... 15 5.1 Steady state characteristics... .15 5.1.1 General..... .15 5.1.2 Active power and reactive power.... .15 5.1.3 Operable voltage .... .16 5.1.4 ReactivepowercapabilityforlowDCvoltage .18 5.1.5 Operable frequency.. ..19 5.1.6 Power factor..... 5.2 Transient-response characteristics .21 5.2.1 General.. 21 5.2.2 Active power control.. .21 5.2.3 Reactive power control.. .22 5.2.4 Grid voltage variation.. .23 5.2.5 Grid voltage phase angle variation. ..25 5.2.6 Grid voltage unbalance.. ..26 5.2.7 Grid frequency variation... AnnexA(normative)Summaryoftest items. ...29 Annex B(normative)Formatfor recording test results. .32 B.1 .32 General B.2 Steady state characteristics. .32 B.2.1 Activepower and reactivepower(see 5.1.2). .32 B.2.2 Operablevoltage(see5.1.3)andreactivepowercapabilityforlowDC voltage (see 5.1.4) ...33 B.2.3 Operablefrequency(see5.1.5). ..34 B.2.4 Powerfactor(see 5.1.6) ..34 B.3 Transient-response characteristics ..35 B.3.1 Active power control (see 5.2.2) ..35 B.3.2 Reactive power control (see 5.2.3) .36 B.3.3 Grid voltage variation (see 5.2.4). .37 B.3.4 Grid voltagephase anglevariation (see5.2.5) B.3.5 Grid voltage unbalance (see 5.2.6) 1 IEC63409-3:2025IEC2