EN IEC 61400-12-6:2022

Wind energy generation systems - Part 12-6: Measurement based nacelle transfer function of electricity producing wind turbines

IEC 61400-12-6:2022 specifies a procedure for measuring the nacelle transfer function of a single electricity-producing, horizontal axis wind turbine, which is not considered to be a small wind turbine in accordance with IEC 61400-2. It is expected that this document be used when a valid nacelle transfer function is needed to execute a power performance measurement according to IEC 61400-12-2. This document specifies how to characterise a wind turbine's nacelle transfer function. The nacelle transfer function is determined by collecting simultaneous measurements of nacelle‑measured wind speed and free stream wind speed (as measured on a meteorological mast) for a period that is long enough to establish a statistically significant database over a range of wind speeds and under varying wind and atmospheric conditions. The procedure also provides guidance on determination of measurement uncertainty including assessment of uncertainty sources and recommendations for combining them. This first edition of IEC 61400-12-6 is part of a structural revision that cancels and replaces the performance standards IEC 61400-12-1:2017 and IEC 61400-12-2:2013. The structural revision contains no technical changes with respect to IEC 61400-12-1:2017 and IEC 61400‑12‑2:2013, but the parts that relate to wind measurements, measurement of site calibration and assessment of obstacle and terrain have been extracted into separate standards.

Windenergieanlagen - Teil 12-6: Messbasierte Gondelübertragungsfunktion von stromerzeugenden Windkraftanlagen

Systèmes de génération d'énergie éolienne - Partie 12-6: Fonction de transfert de la nacelle fondée sur le mesurage des éoliennes de production d'électricité

IEC 61400-12-6:2022 spécifie une procédure de mesure de la fonction de transfert de la nacelle d’une éolienne simple de production d’électricité à axe horizontal, qui n’est pas considérée comme un petit aérogénérateur selon l’IEC 61400-2. Il est attendu que le présent document soit utilisé lorsqu’il est nécessaire d'employer une fonction de transfert de la nacelle valide pour mesurer la performance de puissance conformément à l’IEC 61400-12-2. Le présent document décrit la façon de déterminer la fonction de transfert de la nacelle d’une éolienne. La fonction de transfert de la nacelle est déterminée en collectant simultanément des valeurs de mesure de la vitesse du vent mesurée à la nacelle et de la vitesse du vent en écoulement libre (mesurée sur un mât météorologique) pendant une période suffisamment longue pour créer une base de données statistiquement significative sur une certaine plage de vitesses du vent et dans des conditions de vent et des conditions atmosphériques variables. Cette procédure fournit également des recommandations relatives à la détermination de l’incertitude de mesure, incluant l’évaluation des sources d’incertitude et des recommandations qui permettent de les combiner. La présente première édition de l’IEC 61400-12-6 fait partie d'une révision structurelle qui annule et remplace les normes de performance IEC 61400-12-1:2017 et IEC 61400-12-2:2013. Cette révision structurelle ne contient aucune modification technique par rapport à l'IEC 61400‑12‑1:2017 et l'IEC 61400-12‑2:2013. Toutefois, les parties relatives aux mesurages du vent, au mesurage de l'étalonnage du site et à l'évaluation des obstacles et du terrain ont été extraites vers des normes distinctes.

Sistemi za proizvodnjo energije na veter - 12-6. del: Prenosna funkcija na osnovi meritev za vetrne turbine, ki proizvajajo električno energijo (IEC 61400-12-6:2022)

General Information

• Status: Published
• Publication Date: 06-Oct-2022
• ICS: 27.180 - Wind turbine energy systems
• Technical Committee: CLC/TC 88 - Wind turbines
• Drafting Committee: IEC/TC 88 - IEC_TC_88
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 07-Oct-2022
• Due Date: 30-Jul-2021
• Completion Date: 07-Oct-2022
• Ref Project: SIST EN IEC 61400-12-6:2022 - Wind energy generation systems - Part 12-6: Measurement based nacelle transfer function of electricity producing wind turbines (IEC 61400-12-6:2022)

Relations

• Replaces: EN 61400-12-2:2013 - Wind turbines - Part 12-2: Power performance of electricity-producing wind turbines based on nacelle anemometry
• Effective Date: 22-Jan-2023
• Replaces: EN 61400-12-2:2013/AC:2016-10 - Wind turbines - Part 12-2: Power performance of electricity-producing wind turbines based on nacelle anemometry
• Effective Date: 29-Nov-2022
• Replaces: EN 61400-12-1:2017/AC:2019-12 - Wind energy generation systems - Part 12-1: Power performance measurement of electricity producing wind turbines
• Effective Date: 29-Nov-2022
• Replaces: EN 61400-12-1:2017 - Wind energy generation systems - Part 12-1: Power performance measurement of electricity producing wind turbines
• Effective Date: 29-Nov-2022
• Replaces: EN 61400-12-1:2017/AC:2021-06 - Wind energy generation systems - Part 12-1: Power performance measurement of electricity producing wind turbines
• Effective Date: 29-Nov-2022
• Replaces: EN 61400-12-1:2017/AC:2020-04 - Wind energy generation systems - Part 12-1: Power performance measurements of electricity producing wind turbines
• Effective Date: 29-Nov-2022

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2022
Sistemi za proizvodnjo energije na veter - 12-6. del: Prenosna funkcija na osnovi
meritev za vetrne turbine, ki proizvajajo električno energijo (IEC 61400-12-6:2022)
Wind energy generation systems - Part 12-6: Measurement based nacelle transfer
function of electricity producing wind turbines (IEC 61400-12-6:2022)
Windenergieanlagen - Teil 12-6: Messbasierte Gondelübertragungsfunktion von
stromerzeugenden Windkraftanlagen (IEC 61400-12-6:2022)
Systèmes de génération d'énergie éolienne - Partie 12-6: Fonction de transfert de la
nacelle fondée sur le mesurage des éoliennes de production d'électricité (IEC 61400-12-
6:2022)
Ta slovenski standard je istoveten z: EN IEC 61400-12-6:2022
ICS:
27.180 Vetrne elektrarne Wind turbine energy systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61400-12-6

NORME EUROPÉENNE
EUROPÄISCHE NORM October 2022
ICS 27.180
English Version
Wind energy generation systems - Part 12-6: Measurement
based nacelle transfer function of electricity producing wind
turbines
(IEC 61400-12-6:2022)
Systèmes de génération d'énergie éolienne - Partie 12-6: Windenergieanlagen - Teil 12-6: Messbasierte
Fonction de transfert de la nacelle fondée sur le mesurage Gondelübertragungsfunktion von stromerzeugenden
des éoliennes de production d'électricité Windkraftanlagen
(IEC 61400-12-6:2022) (IEC 61400-12-6:2022)
This European Standard was approved by CENELEC on 2022-10-04. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61400-12-6:2022 E

European foreword
The text of document 88/826/CDV, future edition 1 of IEC 61400-12-6, prepared by IEC/TC 88 "Wind
energy generation systems" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 61400-12-6:2022.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-07-04
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2025-10-04
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61400-12-6:2022 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 61400-2 NOTE Harmonized as EN 61400-2
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60688 - Electrical measuring transducers for EN 60688 -
converting AC and DC electrical quantities
to analogue or digital signals
IEC 61400-12-1 - Wind energy generation systems - Part 12- EN 61400-12-1 -
1: Power performance measurement of
electricity producing wind turbines
IEC 61400-12-2 2022 Wind energy generation systems - Part 12- EN IEC 61400-12-2 2022
2: Power performance of electricity
producing wind turbines based on nacelle
anemometry
IEC 61400-12-3 - Wind energy generation systems - Part 12- EN IEC 61400-12-3 -
3: Power performance - Measurement
based site calibration
IEC 61400-12-5 2022 Wind energy generation systems - Part 12- EN IEC 61400-12-5 2022
5: Power performance - Assessment of
obstacles and terrain
IEC 61400-50-1 - Wind energy generation systems - Part 50- EN IEC 61400-50-1 -
1: Wind Measurement - Application of
Meteorological Mast, Nacelle and Spinner
Mounted Instruments
ISO/IEC Guide 98-3 2008 Uncertainty of measurement - Part 3: - -
Guide to the expression of uncertainty in
measurement (GUM:1995)
Under preparation. Stage at the time of publication: FprEN IEC 61400-50-1:2022.
IEC 61400-12-6 ®
Edition 1.0 2022-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Wind energy generation systems –

Part 12-6: Measurement based nacelle transfer function of electricity producing

wind turbines
Systèmes de génération d'énergie éolienne –

Partie 12-6: Fonction de transfert de la nacelle fondée sur le mesurage des

éoliennes de production d'électricité

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.180 ISBN 978-2-8322-5604-6

– 2 – IEC 61400-12-6:2022 © IEC 2022
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Symbols, units and abbreviated terms . 11
5 Overview of test method . 15
6 Preparation for measurement of nacelle transfer function . 15
6.1 General . 15
6.2 Wind turbine . 15
6.3 Test site . 16
6.3.1 General . 16
6.3.2 Terrain classification . 17
6.4 Test plan . 17
7 Test equipment . 17
7.1 General . 17
7.2 Data acquisition . 18
8 Measurement procedure . 19
8.1 General . 19
8.2 Data system(s) synchronisation . 19
8.3 Data collection . 20
8.4 Data quality check . 20
8.4.1 General . 20
8.4.2 Measured signals are in range and available . 20
8.4.3 Sensors are operating properly . 20
8.4.4 Ensure data acquisition system(s) is(are) operating properly . 21
8.4.5 Sector self-consistency check . 21
8.5 Data rejection . 21
8.6 Data correction . 21
8.7 Database . 22
9 Derived results . 22
9.1 Overview of derived results . 22
9.2 Determination of measured nacelle transfer function . 23
9.3 Data quality check . 24
9.3.1 General . 24
9.3.2 Directional stability check . 24
9.3.3 Self-consistency check for NTF, using the NPC . 25
9.4 Uncertainty analysis . 25
10 Reporting format . 25
Annex A (informative) Nacelle instrument mounting . 29
A.1 General . 29
A.2 Preferred method of anemometer's mounting . 29
A.3 Preferred position of anemometer . 29
Annex B (normative) Evaluation of uncertainty in measurement . 31
B.1 General . 31

IEC 61400-12-6:2022 © IEC 2022 – 3 –
B.2 The measurands . 31
B.3 Uncertainty components. 31
B.4 Wind direction uncertainty . 33
Annex C (normative) Theoretical basis for determining the uncertainty of
measurement using the method of bins . 34
C.1 General . 34
C.2 Propagation of uncertainty through the stages of NTF/NPC measurement . 35
C.3 Category A uncertainties . 38
C.3.1 General . 38
C.3.2 Category A uncertainty in electric power . 38
C.4 Category B uncertainties . 39
C.4.1 General .
...