IEC_61400-12-2_Ed.1.pdf

FORM CDV(IEC)2009-01-09 Registered trademark of the International Electrotechnical Commission 88/409/CDV COMMITTEE DRAFT FOR VOTE(CDV)PROJET DE COMIT POUR VOTE(CDV)Project number Numro de projet IEC 61400-12-2 Ed.1 IEC/TC or SC:CEI/CE ou SC:88 Secretariat/Secrtariat The Netherlands Submitted for parallel voting in CENELEC Soumis au vote parallle au CENELEC Date of circulation Date de diffusion 2011-08-12 Closing date for voting(Voting mandatory for P-members)Date de clture du vote(Vote obligatoire pour les membres(P)2012-01-13 Also of interest to the following committees Intresse galement les comits suivants Supersedes document Remplace le document See note below.Proposed horizontal standard Norme horizontale suggre Other TC/SCs are requested to indicate their interest,if any,in this CDV to the TC/SC secretary Les autres CE/SC sont requis dindiquer leur intrt,si ncessaire,dans ce CDV lintention du secrtaire du CE/SC Functions concerned Fonctions concernes Safety Scurit EMC CEM Environment Environnement Quality assurance Assurance qualit CE DOCUMENT EST TOUJOURS LTUDE ET SUSCEPTIBLE DE MODIFICATION.IL NE PEUT SERVIR DE RFRENCE.LES RCIPIENDAIRES DU PRSENT DOCUMENT SONT INVITS PRSENTER,AVEC LEURS OBSERVATIONS,LA NOTIFICATION DES DROITS DE PROPRIT DONT ILS AURAIENT VENTUELLEMENT CONNAISSANCE ET FOURNIR UNE DOCUMENTATION EXPLICATIVE.THIS DOCUMENT IS STILL UNDER STUDY AND SUBJECT TO CHANGE.IT SHOULD NOT BE USED FOR REFERENCE PURPOSES.RECIPIENTS OF THIS DOCUMENT ARE INVITED TO SUBMIT,WITH THEIR COMMENTS,NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.Title:IEC 61400-12-2 Ed.1:Wind turbines Part 12-2 Power performance of electricity producing wind turbines based on nacelle anemometry Introductory note In the absence of any progress the SMB decided to allocate the PWI stage(Preliminary Work Item)to this project.The project is intended to be re-introduced into the TC 88 programme of work by simultaneous circulation of a NWIP and a CDV.The TC 88 P-members are invited to vote on the proposal(reference 88/408/NP)as well.The French NC has not provided a French version for this CDV during the allowed two month period.ATTENTION IEC CENELEC PARALLEL VOTING The attention of IEC National Committees,members of CENELEC,is drawn to the fact that this Committee Draft for Vote(CDV)for an International Standard is submitted for parallel voting.The CENELEC members are invited to vote through the CENELEC online voting system.Copyright 2011 International Electrotechnical Commission,IEC.All rights reserved.It is permitted to download this electronic file,to make a copy and to print out the content for the sole purpose of preparing National Committee positions.You may not copy or mirror the file or printed version of the document,or any part of it,for any other purpose without permission in writing from IEC.61400-12-2/CDV IEC:201X(E)-2-CONTENTS FOREWORD.-4-INTRODUCTION.-6-1 Scope.-7-5 2 Normative references.-7-3 Terms and definitions.-8-4 Symbols and units.-11-5 Overview of test method.-14-6 Preparation for performance test.-17-10 7 Test equipment.-20-8 Measurement procedure.-24-9 Derived results.-28-10 Reporting format.-31-Annex A(informative)Nacelle instrument mounting.-39-15 Annex B(normative)Measurement Sector Procedure.-41-Annex C(normative)Nacelle wind speed transfer function validity procedure.-47-Annex D(normative)Nacelle wind speed transfer function measurement procedure.-48-Annex E(normative)Evaluation of uncertainty in measurement.-55-Annex F(normative)Theoretical basis for determining the uncertainty of 20 measurement using the method of bins.-59-Annex G(normative)NTF/NPC uncertainty estimates and calculation.-67-Annex H(normative)Allowable anemometry instrument types.-80-Annex I(informative)Results and uncertainty considerations.-82-Annex J(informative)Example multi-turbine NTF/NPC uncertainty calculation.-87-25 Annex K(informative)Organisation of test,safety and communication.-95-Annex L(informative)NPC and NTF flowchart.-96-61400-12-2/CDV IEC:201X(E)-3-List of Figures Figure 1 Procedural overview.-16-Figure 2 Presentation of example data:transfer function resulting from Annex D.-34-Figure 3 Presentation of sample data:nacelle power performance test scatter plots.-35-Figure 4 Example of sample data:measured power curve and Cp curve.-36-5 Figure A.1 Mounting of anemometer on top of nacelle.-40-Figure B.1 Sectors to exclude due to wakes of neighbouring and operating wind turbines and significant obstacles.-43-Figure B.2.Example of the result of a sector self-consistency check.-45-Figure D.1 Nacelle transfer function for wind speed.-53-10 Figure J.1 Impact of Multiple Turbine Testing on Measurement Uncertainty.-94-Figure J.2 Impact of Multiple Turbine Testing on Sampling Uncertainty.-94-List of Tables Table 1 Slope Terrain classification.-19-Table 2 RIX Terrain classification.-19-15 Table 3 Ridge slope effects on terrain class.-20-Table 4 Example of a measured power c