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BS EN IEC 61400-12-5: 2022

BS EN IEC 61400-12-5: 2022

$142.49

Wind energy generation systems – Power performance. Assessment of obstacles and terrain

Published By Publication Date Number of Pages
BSI 2022 32
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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.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
8 Blank Page
9 English
CONTENTS
11 FOREWORD
13 INTRODUCTION
14 1 Scope
2 Normative references
3 Terms and definitions
16 4 Symbols, units and abbreviated terms
5 General
17 6 Measurement sector procedure to be used for power performance measurements according to IEC 61400-12-1
6.1 General
Tables
Table 1 – Other International Standards which refer to this document
Table 2 – Interfaces from this document to other International Standards
18 6.2 Requirements regarding neighbouring operating wind turbines
6.3 Requirements regarding obstacles
19 6.4 Method for calculation of sectors to exclude
Table 3 – Obstacle requirements: relevance of obstacles
20 Figures
Figure 1 – Sectors to exclude due to wakes of neighbouring and operating wind turbines and significant obstacles
21 Figure 2 – An example of sectors to exclude due to wakes of the wind turbine under test, a neighbouring operating wind turbine and a significant obstacle
22 6.5 Special requirements for extended obstacles
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
8 Measurement sector procedure to be used during the determination of the nacelle power curve (NPC)
8.1 General
23 8.2 Requirements regarding neighbouring operating wind turbines
8.3 Requirements regarding obstacles
24 8.4 Calculation of the excluded sector
Table 4 – Obstacle requirements: relevance of obstacles
25 8.5 Self-consistency check procedure for the measurement sector
26 9 Assessment of terrain at the test site
Figure 3 – Example of the result of a sector self-consistency check
27 Figure 4 – Illustration of area to be assessed, top view
Table 5 – Test site requirements: topographical variations
28 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, row 2)
Figure 6 – Determination of slope for the distance “2L to 4L” and “8L to 16L” and the case “outside measurement sector” (Table 5, row 3 and row 5)
29 10 Terrain classification for evaluation of NTF and NPC
10.1 General
10.2 RIX indices
10.3 Average slope
30 10.4 Determine terrain class
Table 6 – Slope terrain classification
Table 7 – RIX terrain classification
Table 8 – Final terrain class
31 10.5 Ridge formations
Table 9 – Maximum ridge step effects on terrain class

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BS EN IEC 61400-12-5: 2022
$142.49