🔥🔥 Don’t Miss Out on Our End of Autumn Sale. If you have any questions, feel free to click the bottom right corner to contact our customer service..

Concat us[email protected]
Shopping Cart

No products in the cart.

🔍
BS EN IEC 61400-12-6:2022

BS EN IEC 61400-12-6:2022

$198.66

Wind energy generation systems – Measurement based nacelle transfer function of electricity producing wind turbines

Published By Publication Date Number of Pages
BSI 2022 64
PDF Format Searchable Printable Preview Now
Guaranteed Safe Checkout
Category:

If you have any questions, feel free to reach out to our online customer service team by clicking on the bottom right corner. We’re here to assist you 24/7.
Email:[email protected]

IEC 61400-12-6:2022 specifies a procedure for measuring the nacelle transfer function of a single electricity-producing, horizontal axis wind turbine, which is not considered to be a small wind turbine in accordance with IEC 61400-2. It is expected that this document be used when a valid nacelle transfer function is needed to execute a power performance measurement according to IEC 61400-12-2. This document specifies how to characterise a wind turbine’s nacelle transfer function. The nacelle transfer function is determined by collecting simultaneous measurements of nacelle‑measured wind speed and free stream wind speed (as measured on a meteorological mast) for a period that is long enough to establish a statistically significant database over a range of wind speeds and under varying wind and atmospheric conditions. The procedure also provides guidance on determination of measurement uncertainty including assessment of uncertainty sources and recommendations for combining them. This first edition of IEC 61400-12-6 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
12 FOREWORD
14 INTRODUCTION
15 1 Scope
2 Normative references
16 3 Terms and definitions
18 4 Symbols, units and abbreviated terms
22 5 Overview of test method
6 Preparation for measurement of nacelle transfer function
6.1 General
6.2 Wind turbine
23 6.3 Test site
6.3.1 General
24 6.3.2 Terrain classification
6.4 Test plan
7 Test equipment
7.1 General
25 7.2 Data acquisition
26 8 Measurement procedure
8.1 General
8.2 Data system(s) synchronisation
27 8.3 Data collection
8.4 Data quality check
8.4.1 General
8.4.2 Measured signals are in range and available
8.4.3 Sensors are operating properly
28 8.4.4 Ensure data acquisition system(s) is(are) operating properly
8.4.5 Sector self-consistency check
8.5 Data rejection
8.6 Data correction
29 8.7 Database
9 Derived results
9.1 Overview of derived results
30 9.2 Determination of measured nacelle transfer function
31 9.3 Data quality check
9.3.1 General
9.3.2 Directional stability check
32 9.3.3 Self-consistency check for NTF, using the NPC
9.4 Uncertainty analysis
10 Reporting format
34 Figures
Figure 1 – Presentation of example data: measured transfer function
35 Tables
Table 1 – Example of presentation of a measured power curve based on data from the meteorological mast, for consistency check
36 Annex A (informative)Nacelle instrument mounting
A.1 General
A.2 Preferred method of anemometer’s mounting
A.3 Preferred position of anemometer
37 Figure A.1 – Mounting of anemometer on top of nacelle
38 Annex B (normative)Evaluation of uncertainty in measurement
B.1 General
B.2 The measurands
B.3 Uncertainty components
39 Table B.1 – Uncertainty components in nacelle transfer function evaluation
40 B.4 Wind direction uncertainty
Table B.2 – Uncertainty components in nacelle based absolute wind direction
41 Annex C (normative)Theoretical basis for determining the uncertainty of measurement using the method of bins
C.1 General
42 C.2 Propagation of uncertainty through the stages of NTF/NPC measurement
43 Table C.1 – Example cancellation sources
45 C.3 Category A uncertainties
C.3.1 General
C.3.2 Category A uncertainty in electric power
46 C.4 Category B uncertainties
C.4.1 General
Table C.2 – List of category A and B uncertainties for NTF
47 C.4.2 Category B uncertainties in climatic variations
C.5 Expanded uncertainty
Table C.3 – Expanded uncertainties
48 Annex D (normative)NTF uncertainty estimates and calculation
D.1 Methods and assumptions
D.1.1 General
D.1.2 Site calibration
49 Table D.1 – Estimates for uncertainty components from site calibration
50 D.1.3 Nacelle transfer function uncertainty component estimates
51 Table D.2 – Estimates for uncertainty components from NTF measurement
52 D.1.4 Nacelle power curve uncertainty component estimates
D.1.5 Wind direction uncertainty
53 Table D.3 – Estimates for uncertainty components for wind direction
54 D.1.6 Contribution factors
Table D.4 – Estimates for contribution factors for site calibration
55 D.2 Uncertainty example calculations
D.2.1 Example description
Table D.5 – Estimates for contribution factors for NTF
56 D.2.2 Example case – NTF uncertainty
D.2.3 Example case – NPC uncertainty
58 Annex E (normative)Allowable anemometry instrument types
E.1 General
E.2 Recalibration of sonic anemometers
E.3 Uncertainty of sonic and propeller anemometers
59 Annex F (informative)Organisation of test, safety and communication
F.1 General
F.2 Responsibility for test
F.3 Safety during test
F.4 Communication
F.5 Prior to test
F.6 During test
60 F.7 After test
61 Annex G (informative)NTF flowchart
Figure G.1 – NTF flowchart
62 Bibliography

Related products

BS EN IEC 61400-12-6:2022
$198.66