EN IEC 61400-12-3:2022

SLOVENSKI STANDARD
01-december-2022
Sistemi za proizvodnjo energije na veter - 12-3. del: Preskušanje zmogljivosti -
Kalibracija mesta na podlagi meritev (IEC 61400-12-3:2022)
Wind energy generation systems - Part 12-3: Power performance - Measurement based
site calibration (IEC 61400-12-3:2022)
Windenergieanlagen - Teil 12-3: Leistungsverhalten - Messbasierte Standortkalibrierung
(IEC 61400-12-3:2022)
Systèmes de génération d’énergie éolienne - Partie 12-3: Performance de puissance -
Étalonnage du site fondé sur le mesurage (IEC 61400-12-3:2022)
Ta slovenski standard je istoveten z: EN IEC 61400-12-3:2022
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 61400-12-3

NORME EUROPÉENNE
EUROPÄISCHE NORM October 2022
ICS 27.180
English Version
Wind energy generation systems - Part 12-3: Power
performance - Measurement based site calibration
(IEC 61400-12-3:2022)
Systèmes de génération d'énergie éolienne - Partie 12-3: Windenergieanlagen - Teil 12-3: Leistungsverhalten -
Performance de puissance - Étalonnage du site fondé sur le Messbasierte Standortkalibrierung
mesurage (IEC 61400-12-3:2022)
(IEC 61400-12-3:2022)
This European Standard was approved by CENELEC on 2022-10-03. 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.
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Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
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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 61400-12-3:2022 E

European foreword
The text of document 88/824/CDV, future edition 1 of IEC 61400-12-3, prepared by IEC/TC 88 "Wind
energy generation systems" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 61400-12-3:2022.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-07-03
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2025-10-03
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 61400-12-3:2022 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 61400-50 NOTE Harmonized as EN IEC 61400-50
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 61400-12-1 - Wind energy generation systems - Part 12- EN IEC 61400-12-1 -
1: Power performance measurement of
electricity producing wind turbines
IEC 61400-12-5 - Wind energy generation systems - Part 12- EN IEC 61400-12-5 -
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 time of publication: FprEN IEC 61400-50-1:2022.
IEC 61400-12-3 ®
Edition 1.0 2022-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Wind energy generation systems –

Part 12-3: Power performance – Measurement based site calibration

Systèmes de génération d'énergie éolienne –

Partie 12-3: Performance de puissance – Étalonnage du site fondé sur le

mesurage
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.180 ISBN 978-2-8322-5596-4

– 2 – IEC 61400-12-3:2022 © IEC 2022
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Symbols, units and abbreviated terms . 10
5 General . 12
6 Overview of the procedure . 13
7 Test set-up . 14
7.1 Considerations for selection of the test wind turbine and location of the
meteorological mast . 14
7.1.1 General . 14
7.1.2 Type A: . 14
7.1.3 Type B: . 14
7.1.4 Type C:. 15
7.2 Instrumentation . 15
8 Data acquisition and rejection criteria . 16
9 Analysis . 17
9.1 General . 17
9.2 Assessment of site shear conditions . 17
9.2.1 Shear calculations and characterisation plots . 17
9.2.2 Assess significance of shear . 17
9.2.3 Establish correlation of shear between locations . 18
9.3 Method 1: Bins of wind direction and wind shear . 19
9.4 Method 2: Linear regression method where wind shear is not a significant
influence . 19
9.5 Additional calculations . 20
10 Site calibration uncertainty . 21
10.1 Site calibration category A uncertainty . 21
10.1.1 Site calibration K-fold analysis . 21
10.1.2 Site calibration statistical uncertainty for each fold. 22
10.2 Site calibration category B uncertainty . 23
10.2.1 General . 23
10.2.2 Anemometer – Pre-calibration . 23
10.2.3 Anemometer – Post-calibration . 23
10.2.4 Anemometer – Classification . 23
10.2.5 Anemometer – Mounting . 24
10.2.6 Anemometer – Data acquisition . 24
10.2.7 Anemometer – Lightning finial. 25
10.3 Combining uncertainties in the wind speed measurement from flow distortion
due to site calibration u . 25
VT,i
10.4 Combined uncertainty . 26
11 Quality checks and additional uncertainties . 26
11.1 Convergence check . 26
11.2 Correlation check for linear regression (see 9.4) . 26
11.3 Change in correction between adjacent wind direction bins . 26

IEC 61400-12-3:2022 © IEC 2022 – 3 –
11.3.1 General . 26
11.3.2 Removal of the wind direction sensor between site calibration and
power performance test . 27
11.4 Site calibration and power performance measurements in different seasons . 28
Annex A (informative) Verification of results . 29
Annex B (informative) Site calibration examples . 31
B.1 Example A . 31
B.1.1 Site description: . 31
B.1.2 Site calibration setup: . 31
B.1.3 Site calibration evaluation: . 31
B.1.4 Step 1: Check the significance of wind shear at the site according to
9.2.2: . 31
B.1.5 Step 2: Verify correlation of wind shear at wind turbine and reference

meteorological mast locations – Example A . 32
B.1.6 Step 3: Calculate results according to 9.2.3 . 33
B.1.7 Step 4: Quality checks and additional uncertainties . 33
B.2 Example B . 35
B.2.1 Site description: . 35
B.2.2 Site calibration setup: . 35
B.2.3 Step 1: Check the significance of wind shear at the site:.
...