IEC_TS_61724-3-2016.pdf

IEC TS 61724-3 Edition 1.0 2016-07 TECHNICAL SPECIFICATION Photovoltaic system performance Part 3:Energy evaluation method IEC TS 61724-3:2016-07(en)colourinside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2016 IEC,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 mechanical,including photocopying and microfilm,without permission in writing from either IEC or IECs member National Committee in the country of the requester.If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,please contact the address below or your local IEC member National Committee for further information.IEC Central Office Tel.:+41 22 919 02 11 3,rue de Varemb Fax:+41 22 919 03 00 CH-1211 Geneva 20 infoiec.ch Switzerland www.iec.ch About the IEC The International Electrotechnical Commission(IEC)is the leading global organization that prepares and publishes 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 latest edition,a corrigenda or an amendment might have been published.IEC Catalogue-webstore.iec.ch/catalogue The stand-alone application for consulting the entire bibliographical information on IEC International Standards,Technical Specifications,Technical Reports and other documents.Available for PC,Mac OS,Android Tablets and iPad.IEC publications search-www.iec.ch/searchpub The advanced search enables to find IEC publications by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,replaced and withdrawn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications released.Available online and also once a month by email.Electropedia-www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing 20 000 terms and definitions in English and French,with equivalent terms in 15 additional languages.Also known as the International Electrotechnical Vocabulary(IEV)online.IEC Glossary-std.iec.ch/glossary 65 000 electrotechnical terminology entries in English and French extracted from the Terms and Definitions clause of IEC publications issued since 2002.Some entries have been collected from earlier publications of IEC TC 37,77,86 and CISPR.IEC Customer Service Centre-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:csciec.ch.IEC TS 61724-3 Edition 1.0 2016-07 TECHNICAL SPECIFICATION Photovoltaic system performance Part 3:Energy evaluation method INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 27.160 ISBN 978-2-8322-3531-7 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.colourinside 2 IEC TS 61724-3:2016 IEC 2016 CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references.8 3 Terms and definitions.8 4 Test scope,schedule and duration.11 5 Equipment and measurements.11 6 Procedure.12 6.1 Overview.12 6.2 Calculation and documentation of predicted energy and the method that will be used to calculate the expected energy.14 6.2.1 General.14 6.2.2 Definition of test boundary to align with intended system boundary.14 6.2.3 Definition of the meteorological inputs used for the prediction.15 6.2.4 Definition of the PV inputs used for the prediction.15 6.2.5 Definition of measured data that will be collected during the test.16 6.2.6 Definition of the model calculations.17 6.2.7 Predicted energy for the specified system and time period.18 6.2.8 Uncertainty definition.18 6.3 Measurement of data.19 6.4 Identification of data associated with unavailability.19 6.5 Identification of erroneous data and replacement or adjustment of such data and preparation of model input dataset.19 6.5.1 General.19 6.5.2 Data checks for each data stream.20 6.5.3 Shading of irradiance sensor.20 6.5.4 Calibration accuracy.21 6.5.5 Final check.21 6.5.6 Using data from multiple sensors.21 6.5.7 Substitution of back-up data for erroneous or missing data.22 6.5.8 Out-of-range data or data that are known to be incorrect.22 6.5.9 Missing data.22 6.5.10 Partially missing data or partial unavailability.22 6.5.11 Curtailment because of external requirement.23 6.5.12 Inverter clipping(constrained operation).23 6.5.13 Planned outage or force majeure.23 6.5.14 Grid support events(e.g.deviation from unity power factor).23 6.6 Calculation of expected energy.23 6.6.1 General.23 6.6.2 Measure inputs.24 6.6.3 Acceptability of data.24 6.6.4 Time interval consistency.24 6.6.5 Time stamp alignment.24 6.6.6 Calculate expected energy during times of unavailability.24 6.