IEC_61400-12-1-2005.pdf

INTERNATIONAL STANDARD IEC61400-12-1 First edition2005-12 Wind turbines Part 12-1:Power performance measurements of electricity producing wind turbines Reference number IEC 61400-12-1:2005(E)Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Publication numbering As from 1 January 1997 all IEC publications are issued with a designation in the 60000 series.For example,IEC 34-1 is now referred to as IEC 60034-1.Consolidated editions The IEC is now publishing consolidated versions of its publications.For example,edition numbers 1.0,1.1 and 1.2 refer,respectively,to the base publication,the base publication incorporating amendment 1 and the base publication incorporating amendments 1 and 2.Further information on IEC publications The technical content of IEC publications is kept under constant review by the IEC,thus ensuring that the content reflects current technology.Information relating to this publication,including its validity,is available in the IEC Catalogue of publications(see below)in addition to new editions,amendments and corrigenda.Information on the subjects under consideration and work in progress undertaken by the technical committee which has prepared this publication,as well as the list of publications issued,is also available from the following:IEC Web Site(www.iec.ch)Catalogue of IEC publications The on-line catalogue on the IEC web site(www.iec.ch/searchpub)enables you to search by a variety of criteria including text searches,technical committees and date of publication.On-line information is also available on recently issued publications,withdrawn and replaced publications,as well as corrigenda.IEC Just Published This summary of recently issued publications(www.iec.ch/online_news/justpub)is also available by email.Please contact the Customer Service Centre(see below)for further information.Customer Service Centre If you have any questions regarding this publication or need further assistance,please contact the Customer Service Centre:Email:custserviec.ch Tel:+41 22 919 02 11 Fax:+41 22 919 03 00 Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-INTERNATIONAL STANDARD IEC61400-12-1 First edition2005-12 Wind turbines Part 12-1:Power performance measurements of electricity producing wind turbines IEC 2005 Copyright-all rights reserved 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 the publisher.International Electrotechnical Commission,3,rue de Varemb,PO Box 131,CH-1211 Geneva 20,SwitzerlandTelephone:+41 22 919 02 11 Telefax:+41 22 919 03 00 E-mail:inmailiec.ch Web:www.iec.ch XC For price,see current cataloguePRICE CODE Commission Electrotechnique InternationaleInternational Electrotechnical Commission Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2 61400-12-1 IEC:2005(E)CONTENTS FOREWORD.5 INTRODUCTION.7 1 Scope.8 2 Normative references.8 3 Terms and definitions.9 4 Symbols and units.11 5 Preparation for performance test.14 5.1 Wind turbine and electrical connection.14 5.2 Test site.14 6 Test equipment.16 6.1 Electric power.16 6.2 Wind speed.16 6.3 Wind direction.17 6.4 Air density.17 6.5 Rotational speed and pitch angle.17 6.6 Blade condition.17 6.7 Wind turbine control system.17 6.8 Data acquisition system.18 7 Measurement procedure.18 7.1 General.18 7.2 Wind turbine operation.18 7.3 Data collection.18 7.4 Data rejection.19 7.5 Data correction.19 7.6 Database.19 8 Derived results.20 8.1 Data normalization.20 8.2 Determination of the measured power curve.21 8.3 Annual energy production(AEP).21 8.4 Power coefficient.22 9 Reporting format.23 Annex A(normative)Assessment of obstacles at the test site.33 Annex B(normative)Assessment of terrain at the test site.36 Annex C(normative)Site calibration procedure.37 Annex D(normative)Evaluation of uncertainty in measurement.39 Annex E(informative)Theoretical basis for determining the uncertainty of measurement using the method of bins.41 Annex G(normative)Mounting of instruments on the meteorological mast.66 Annex H(normative)Power performance testing of small wind turbines.74 Annex I(normative)Classification of anemometry.77 Annex J(informative)Assessment of cup anemometry.79 Annex K(informative)In situ comparison of anemometers.88 Bibliography.90 Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-61400-12-1 IEC:2005(E)3 Figure 1 Requirements as to distance of the meteorological mast and maximum allowed measurement sectors.15 Figur