IEC 61400-50-2:2022
(Main)Wind energy generation systems - Part 50-2: Wind measurement - Application of ground-mounted remote sensing technology
Wind energy generation systems - Part 50-2: Wind measurement - Application of ground-mounted remote sensing technology
IEC 61400-50-2:2022 is applicable specifically to the use of ground-mounted remote sensing wind measurement instruments, i.e. devices which measure the wind at some location generally above and distant from the location at which the instrument is mounted (e.g. sodars, vertical profiling lidars). This document specifically excludes other types of RSD such as forward facing or scanning lidars. This document specifies the following: a. the procedure and requirements for classifying ground-based RSDs in order to assess the uncertainty pertaining from sensitivity of the RSD response to meteorological conditions that can vary between the RSD calibration place and time and the use case (specific measurement campaign – SMC) place and time; b. the procedures and requirements for calibration of RSDs; c. the assessment of wind speed measurement uncertainty; d. additional checks of the RSD performance and measurement uncertainty during the SMC; e. application of the wind speed uncertainty derived from the RSD calibration and classification to the measurements taken during the SMC (e.g. interpolation of uncertainty or calibration results to different heights); f. requirements for reporting. This first edition of IEC 61400-50-2 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.
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 s'applique spécifiquement à l'utilisation d'instruments de mesure du vent par télédétection montés au sol, c'est-à-dire des dispositifs qui mesurent le vent à un endroit généralement situé au-dessus et éloigné de l'endroit dans lequel l'instrument est monté (par exemple, sodars, lidars à profil vertical). Le présent document exclut spécifiquement d'autres types de RSD tels que les lidars dirigés vers l'avant ou les lidars à balayage. Le présent document spécifie les points suivants:
a. la procédure et les exigences de classification des RSD au sol afin d'évaluer l'incertitude liée à la sensibilité de la réponse du RSD aux conditions météorologiques qui peuvent varier entre le lieu et le moment de l'étalonnage du RSD et le lieu et le moment du cas d'utilisation (SMC – specific measurement campaign, campagne de mesure spécifique).
b. les procédures et les exigences relatives à l'étalonnage des RSD.
c. l'évaluation de l'incertitude de mesure de la vitesse du vent.
d. les contrôles supplémentaires des performances du RSD et de l'incertitude de mesure pendant la SMC.
e. l'application de l'incertitude de la vitesse du vent dérivée de l'étalonnage et de la classification du RSD aux mesurages effectués pendant la SMC (par exemple, interpolation de l'incertitude ou des résultats de l'étalonnage à différentes hauteurs).
f. exigences relatives aux rapports.
La présente première édition de l’IEC 61400-50-2 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.
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Standards Content (Sample)
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
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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
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
– 4 – IEC 61400-50-2:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
WIND ENERGY GENERATION SYSTEMS –
Part 50-2: Wind measurement – Application of
ground-mounted remote sensing technology
FOREWORD
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