EN IEC 61400-12-5:2022
(Main)Wind energy generation systems - Part 12-5: Power performance - Assessment of obstacles and terrain
Wind energy generation systems - Part 12-5: Power performance - Assessment of obstacles and terrain
IEC 61400-12-5:2022 specifies the procedures for assessing the significance of obstacles and terrain variations on a proposed power performance measurement site and applies to the performance testing of wind turbines of all types and sizes connected to the electrical power network as described in other parts of the IEC 61400 series. The procedure applies to the performance evaluation of specific wind turbines at specific locations. This first edition of IEC 61400-12-5 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 12-5: Leistungsverhalten - Bewertung von Hindernissen und Gelände
Systèmes de génération d'énergie éolienne - Partie 12-5: Performance de puissance - Évaluation des obstacles et du terrain
IEC 61400-12-5:2022 spécifie les procédures d'évaluation de l'importance des obstacles et des variations de terrain sur un site proposé pour le mesurage de la performance de puissance et s'applique aux essais de performance des éoliennes de tous types et de toutes tailles raccordées au réseau électrique comme cela est décrit dans d'autres parties de la série IEC 61400. La procédure s'applique à l’évaluation de la performance d'éoliennes spécifiques sur des sites spécifiques. La présente première édition de l’IEC 61400-12-5 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 - 12-5. del: Preskušanje zmogljivosti - Ocena ovir in terena (IEC 61400-12-5:2022)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2022
Sistemi za proizvodnjo energije na veter - 12-5. del: Preskušanje zmogljivosti -
Ocena ovir in terena (IEC 61400-12-5:2022)
Wind energy generation systems - Part 12-5: Power performance - Assessment of
obstacles and terrain (IEC 61400-12-5:2022)
Windenergieanlagen - Teil 12-5: Leistungsverhalten - Bewertung von Hindernissen und
Gelände (IEC 61400-12-5:2022)
Systèmes de génération d'énergie éolienne - Partie 12-5: Performance de puissance -
Évaluation des obstacles et du terrain (IEC 61400-12-5:2022)
Ta slovenski standard je istoveten z: EN IEC 61400-12-5:2022
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 61400-12-5
NORME EUROPÉENNE
EUROPÄISCHE NORM October 2022
ICS 27.180
English Version
Wind energy generation systems - Part 12-5: Power
performance - Assessment of obstacles and terrain
(IEC 61400-12-5:2022)
Systèmes de génération d'énergie éolienne - Partie 12-5: Windenergieanlagen - Teil 12-5: Leistungsverhalten -
Performance de puissance - Évaluation des obstacles et du Bewertung von Hindernissen und Gelände
terrain (IEC 61400-12-5:2022)
(IEC 61400-12-5:2022)
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.
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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
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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 61400-12-5:2022 E
European foreword
The text of document 88/825/CDV, future edition 1 of IEC 61400-12-5, prepared by IEC/TC 88 "Wind
energy generation systems" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 61400-12-5:2022.
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 61400-12-5:2022 was approved by CENELEC as a
European Standard without any modification.
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 61400-12-2 - Wind energy generation systems - Part 12- EN IEC 61400-12-2 -
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 61400-12-6 - Wind energy generation systems - Part 12- EN IEC 61400-12-6 -
6: Measurement based nacelle transfer
function of electricity producing wind
turbines
IEC 61400-12-5 ®
Edition 1.0 2022-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Wind energy generation systems –
Part 12-5: Power performance – Assessment of obstacles and terrain
Systèmes de génération d'énergie éolienne –
Partie 12-5: Performance de puissance – Évaluation des obstacles et du terrain
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.180 ISBN 978-2-8322-5603-9
– 2 – IEC 61400-12-5:2022 © 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 . 9
5 General . 9
6 Measurement sector procedure to be used for power performance measurements
according to IEC 61400-12-1 . 10
6.1 General . 10
6.2 Requirements regarding neighbouring and operating wind turbines . 11
6.3 Requirements regarding obstacles . 11
6.4 Method for calculation of sectors to exclude . 12
6.5 Special requirements for extended obstacles . 15
7 Measurement sector procedure to be used during the determination of the nacelle
transfer function (NTF) between free wind speed and nacelle anemometer wind
speed . 15
8 Measurement sector procedure to be used during the determination of the nacelle
power curve (NPC) . 15
8.1 General . 15
8.2 Requirements regarding neighbouring and operating wind turbines . 16
8.3 Requirements regarding obstacles . 16
8.4 Calculation of the excluded sector . 17
8.5 Self-consistency check procedure for the measurement sector . 18
9 Assessment of terrain at the test site . 19
10 Terrain classification for evaluation of NTF and NPC . 22
10.1 General . 22
10.2 RIX indices . 22
10.3 Average slope . 22
10.4 Determine terrain class . 23
10.5 Ridge formations . 24
Figure 1 – Sectors to exclude due to wakes of neighbouring and operating wind
turbines and significant obstacles . 13
Figure 2 – An example of sectors to exclude due to wakes of the wind turbine under
test, a neighbouring and operating wind turbine and a significant obstacle . 14
Figure 3 – Example of the result of a sector self-consistency check . 19
Figure 4 – Illustration of area to be assessed, top view . 20
Figure 5 – Example of determination of slope and terrain variation from the best-fit
plane: "2L to 4L" and the case "measurement sector" (Table 5, line 2) . 21
Figure 6 – Determination of slope for the distance "2L to 4L" and "8L to 16L" and the
case "outside measurement sector" (Table 5, line 3 and line 5). 21
Table 1 – Interfaces from other International Standards to this document . 10
Table 2 – Interfaces from this document to other International Standards . 10
Table 3 – Obstacle requirements: relevance of obstacles . 12
IEC 61400-12-5:2022 © IEC 2022 – 3 –
Table 4 – Obstacle requirements: relevance of obstacles . 17
Table 5 – Test site requirements: topographical variations . 20
Table 6 – Slope terrain classification . 23
Table 7 – RIX terrain classification . 23
Table 8 – Final terrain class . 23
Table 9 – Maximum ridge step effects on terrain class . 24
– 4 – IEC 61400-12-5:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
WIND ENERGY GENERATION SYSTEMS –
Part 12-5: Power performance –
Assessment of obstacles and terrain
FOREWORD
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