EN IEC 61400-50-2:2022

SLOVENSKI STANDARD
01-december-2022
Sistemi za proizvodnjo energije na veter - 50-2. del: Meritve vetra - Uporaba talne
tehnologije za daljinsko zaznavanje (IEC 61400-50-2:2022)
Wind energy generation systems - Part 50-2: Wind measurement - Application of ground-
mounted remote sensing technology (IEC 61400-50-2:2022)
Windenergieanlagen - Teil 50-2: Windmessungen - Anwendung der bodengestützten
Fernerkundungstechnologie (IEC 61400-50-2:2022)
Systèmes de génération d'énergie éolienne - Partie 50-2: Mesurage du vent - Application
de la technologie de télédétection montée au sol (IEC 61400-50-2:2022)
Ta slovenski standard je istoveten z: EN IEC 61400-50-2:2022
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 61400-50-2

NORME EUROPÉENNE
EUROPÄISCHE NORM October 2022
ICS 27.180
English Version
Wind energy generation systems - Part 50-2: Wind
measurement - Application of ground-mounted remote sensing
technology
(IEC 61400-50-2:2022)
Systèmes de génération d'énergie éolienne - Partie 50-2: Windenergieanlagen - Teil 50-2: Windmessungen -
Mesurage du vent - Application de la technologie de Anwendung der bodengestützten
télédétection montée au sol Fernerkundungstechnologie
(IEC 61400-50-2:2022) (IEC 61400-50-2:2022)
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 61400-50-2:2022 E

European foreword
The text of document 88/829/CDV, future edition 1 of IEC 61400-50-2, prepared by IEC/TC 88 "Wind
energy generation systems" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 61400-50-2:2022.
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 61400-50-2:2022 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 61400-12-1:2017 NOTE Harmonized as EN 61400-12-1:2017 (not modified)
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 61400-50-1 - Wind energy generation systems - Part 50- EN IEC 61400-50-1 -
1: Wind Measurement - Application of
Meteorological Mast, Nacelle and Spinner
Mounted Instruments
Under preparation. Stage at the time of publication: FprEN IEC 61400-50-1:2022.
IEC 61400-50-2 ®
Edition 1.0 2022-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Wind energy generation systems –

Part 50-2: Wind measurement – Application of ground-mounted remote sensing

technology
Systèmes de génération d'énergie éolienne –

Partie 50-2: Mesurage du vent – Application de la technologie de télédétection

montée au sol
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.180 ISBN 978-2-8322-5602-2

– 2 – IEC 61400-50-2:2022 © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Symbols, units and abbreviated terms . 10
5 General . 11
6 Classification of RSDs . 13
6.1 General . 13
6.2 Data acquisition . 14
6.3 Data preparation . 15
6.4 Principle and requirements of a sensitivity test . 15
6.5 Assessment of environmental variable significance . 21
6.6 Assessment of interdependency between environmental variables . 22
6.7 Calculation of accuracy class . 24
6.8 Acceptance criteria . 26
6.9 Classification of RSD . 27
7 Verification of the performance of RSDs . 27
8 Evaluation of uncertainty of measurements by RSDs . 30
8.1 General . 30
8.2 Reference uncertainty . 30
8.3 Uncertainty resulting from the RSD calibration test . 30
8.4 Uncertainty due to RSD classification . 32
8.5 Uncertainty due to non-homogenous flow within the measurement volume . 33
8.6 Uncertainty due to mounting effects . 34
8.7 Combining uncertainties in the wind speed measurement from RSD (u ) . 34
VR,i
9 Additional checks . 34
9.1 Monitoring the performance of the RSD at the application site . 34
9.2 Identification of malfunctioning of the RSD . 34
9.3 Consistency check of the assessment of the RSD systematic uncertainties . 34
9.4 In-situ test of the RSD . 35
10 Application to SMC . 36
11 Reporting. 36
11.1 Common reporting on classification test, calibration test, and monitoring of
the RSD during SMC . 36
11.2 Additional reporting on classification test . 37
11.3 Additional reporting on calibration test . 37
11.4 Additional reporting on SMC . 38
Annex A (informative) Uncertainty due to non-homogenous flow within the
measurement volume . 39
Bibliography . 40

Figure 1 – Tilt angular response V ∕V of a cup anemometer as a function of flow
α  α=0
angle α compared to cosine response (IEC 61400-50-1) . 17

IEC 61400-50-2:2022 © IEC 2022 – 3 –
Figure 2 – Deviation versus upflow angle determined for an RSD with respect to the
cup anemometer in Figure 1 . 17
Figure 3 – Example of sensitivity analysis against wind shear . 19
Figure 4 – Example of wind shear versus turbulence intensity . 23
Figure 5 – Example of percentage deviation of RSD and reference sensor

measurements versus turbulence intensity . 23
Figure 6 – Comparison of 10 min averages of the horizontal wind speed component as
measured by an RSD and a cup anemometer . 29
Figure 7 – Bin-wise comparison of measurement of the horizontal wind speed
component of an RSD and a cup anemometer . 29

Table 1 – Interfaces from other standards to IEC 61400-50-2 . 12
Table 2 – Interfaces from IEC 61400-50-2 to other standards . 12
Table 3 – Bin width example for a list of environmental variables . 18
Table 4 – Parameters derived from a sensitivity analysis of an RSD . 20
Table 5 – Ranges of environmental parameters for sensitivity analysis . 21
Table 6 – Example selection of environmental variables found to have a significant

influence . 22
Table 7 – Sensitivity analysis parameters remaining after analysis of interdependency
of variables . 24
Table 8 – Example scheme for calculating maximum influence of environmental
variables . 25
Table 9 – Preliminary accuracy classes of an RSD considering both all and only the

most significant influential variables . 26
Table 10 – Example final accuracy classes of an RSD . 26
Table 11 – Example of uncertainty calculations arising from calibration of an RSD in
terms of systematic uncertainties . 31
...