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GB/T 46241-2025: Wind energy generation systems - Measurement based nacelle wind speed transfer function of electricity producing wind turbines
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| GB/T 46241-2025 | English | 914 |
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Wind energy generation systems - Measurement based nacelle wind speed transfer function of electricity producing wind turbines
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GB/T 46241-2025
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Basic data
| Standard ID | GB/T 46241-2025 (GB/T46241-2025) |
| Description (Translated English) | Wind energy generation systems - Measurement based nacelle wind speed transfer function of electricity producing wind turbines |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | F11 |
| Classification of International Standard | 27.180 |
| Word Count Estimation | 46,466 |
| Date of Issue | 2025-10-05 |
| Date of Implementation | 2025-10-05 |
| Issuing agency(ies) | State Administration for Market Regulation and Standardization Administration of China |
GB/T 46241-2025: Wind energy generation systems - Measurement based nacelle wind speed transfer function of electricity producing wind turbines
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT46241-2025
ICS 27.180
CCSF11
National Standards of the People's Republic of China
Wind speed of wind turbine generator nacelle in wind power generation system
Transfer function measurement
Published on 2025-10-05
Implemented on October 5, 2025
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Table of Contents
Preface V
1.Scope 1
2 Normative References 1
3.Terms and Definitions 2
4.Symbols, Units, and Abbreviations
5 General Rules for Measurement Methods 8
6.Preparation for nacelle wind speed transfer function measurement 9.
6.1 General Rules 9
6.2 Wind Turbine Generator Sets 9
6.3 Test Site 9
6.4 Test Plan 10
7.Test equipment 10
7.1 General Rules 10
7.2 Data Acquisition 11
8 Measurement Procedure 11
8.1 General Rules 11
8.2 Data System Synchronization 12
8.3 Data Acquisition 12
8.4 Data Quality Verification 12
8.5 Data Removal 13
8.6 Data Correction 13
8.7 Database 14
9.The derived result 14
9.1 General Rules for Derived Results 14
9.2 Determination of the wind speed transfer function in the nacelle 14
9.3 Data Quality Verification 15
9.4 Uncertainty Analysis 16
10 Report Format 16
Appendix A (Informative) Cabin Instrument Installation 19
A.1 General Provisions 19
A.2 Recommended Anemometer Installation Method 19
A.3 Recommended anemometer installation location 19
Appendix B (Normative) Measurement Uncertainty Assessment 20
B.1 General Rules 20
B.2 Measured 20
B.3 Uncertainty component 20
B.4 Wind direction uncertainty 21
Appendix C (Normative) Theoretical Basis for Determining Measurement Uncertainty Using the Interval Method 23
C.1 General Rule 23
C.2 Uncertainty propagation in the measurement process via nacelle wind speed transfer function/nacelle power curve 24
C.3 Type A uncertainty 25
C.4 Type B uncertainty 27
C.5 Expanded uncertainty 27
Appendix D (Normative) Uncertainty Assessment and Calculation of Cabin Wind Speed Transfer Function 29
D.1 Methods and Assumptions 29
D.2 Example Calculation of Uncertainty 34
Appendix E (Normative) Permitted Types of Anemometers 36
E.1 General Rule 36
E.2 Recalibration of Ultrasonic Anemometer 36
E.3 Uncertainty of ultrasonic anemometers and propeller anemometers 36
Appendix F (Informative) Organizations involved in testing, safety, and communication 37
F.1 General Provisions 37
F.2 Responsibility for Testing 37
F.3 Safety during testing 37
F.4 Communication 37
F.5 Early Test 37
F.6 test 37
F.7 37 after measurement
Appendix G (Informative) Flowchart of Cabin Wind Speed Transfer Function 38
References 39
Figure 1 Example 17 of the nacelle wind speed transfer function
Figure A.1 Anemometer installation on the top of the nacelle 19
Figure G.1 Flowchart of nacelle wind speed transfer function 38
Table 1.Example of measured power curve based on wind tower data (for self-consistency verification) 18
Table B.1 Uncertainty Components of the Nacelle Wind Speed Transfer Function 20
Table B.2 Uncertainty Components Based on Absolute Wind Direction in the Cabin 21
Table C.1 Example 24 of Offset Sources
Table C.2 List of Type A and Type B uncertainties in nacelle wind speed transfer function measurement 26
Table C.3 Expanded Uncertainty 28
Table D.1 Evaluation of Uncertainty Components in Site Measurement 29
Table D.2 Evaluation of Uncertainty Components in Nacelle Wind Speed Transfer Function Measurement 31
Table D.3 Evaluation of wind direction uncertainty components 32
Table D.4 Site-Specific Contribution Factor Assessment 33
Table D.5 Evaluation of the contribution factor of the nacelle wind speed transfer function 33
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
This document is equivalent to IEC 61400-12-6.2022 "Wind power generation systems - Part 12-6.Wind speed transfer in wind turbine nacelles".
Function measurement.
The following minimal editorial changes have been made to this document.
---To align with existing standards, the standard title has been changed to "Measurement of Wind Speed Transfer Function in Wind Turbine Nacelles of Wind Power Generation Systems";
---Change formula (C.9) to "Si=SP,i=
σP,i
Ni
"Because formula (C.9) of IEC 61400-12-6.2022 overlaps with formula (C.8)..."
According to the interpretation of the symbols in formula (C.9), formula (C.9) in IEC 61400-12-6.2022 is incorrect.
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed by the China Machinery Industry Federation.
This document is under the jurisdiction of the National Technical Committee on Standardization of Wind Power (SAC/TC50).
This document was drafted by. Wind Power Division of CRRC Zhuzhou Electric Locomotive Research Institute Co., Ltd., and China Electric Power Research Institute Co., Ltd.
Beijing Goldwind Science & Technology Wind Power Equipment Co., Ltd., Windey Energy Technology Group Co., Ltd., Mingyang Smart Energy Group Co., Ltd., Envision
Energy Co., Ltd., China Quality Certification Center Co., Ltd., Beijing Certification Center Co., Ltd., Hunan Xinglan Wind Power Co., Ltd., China Resources
Electric Power Technology Research Institute Co., Ltd., CRRC Shandong Wind Power Co., Ltd., CRRC Zhuzhou Electric Locomotive Research Institute Co., Ltd., Shanghai Electric Wind Power
Group Corporation Limited, China Three Gorges New Energy (Group) Co., Ltd., China Shipbuilding Group Wind Power Development Co., Ltd., Shanghai Zhongren
Shangke New Energy Technology Co., Ltd.
The main drafters of this document are. Wan Yubin, Wang Lei, Fu Deyi, Yang Liu, Niu Yamei, Yu Qingqing, Zou Libing, Zhang Zhaozhi, Yuan Ying, Shi Hao, and Xiao Fuhua.
Meng Qingye, Guo Kaiping, Nie Feng, Li Ning, Liang Ruili, Li Zhengyu, Chen Baokang, Wang Zhilin, Li Gangqiang, Wang Yun, Shi Hang, Fan Shaohui.
Wind speed of wind turbine generator nacelle in wind power generation system
Transfer function measurement
1.Scope
This document describes the method for measuring the wind speed transfer function of the nacelle of a single horizontal axis wind turbine generator. This document is applicable to IEC 61400-
The measurement of the nacelle wind speed transfer function described in 12-2 is not applicable to the nacelle wind speed transfer function of small wind turbine generators as described in IEC 61400-2.
Measurement of the function. This document is used when a nacelle wind speed transfer function is required for power characteristic testing according to IEC 61400-12-2.
The wind speed measured at the nacelle or hub of a wind turbine is affected by the wind rotor (i.e., it speeds up or slows down the wind). This is according to IEC 61400-12-1.
In this system, the anemometer is located on a wind-measuring tower, which is situated between 2 and 4 times the rotor diameter upwind of the wind turbine being measured.
The position allows for direct measurement of "free" wind with minimal interference from the wind turbine rotor being measured. In the program of this document, the anemometer position...
The anemometer is positioned on or near the nacelle of the wind turbine generator. At this location, the wind speed measured by the anemometer is affected by the rotor and...
The strong influence of the nacelle. The procedures in this document include methods for identifying the above-mentioned interferences and implementing appropriate corrections, but note that they are consistent with IEC 61400-
Compared to the stringent measurement requirements in 12-1, the above corrections will increase measurement uncertainty.
This document specifies how to simultaneously measure the nacelle wind speed and free-flow wind speed (measured on the wind tower) over a period of time.
The results characterize the nacelle wind speed transfer function of the wind turbine generator set. The measurement period is long enough to establish a system containing a series of wind speeds and...
A database of statistically significant wind and atmospheric conditions. This document also provides guidance for determining measurement uncertainty, including...
Evaluation of sources of certainty and recommended values for combined uncertainty.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 33225-2025 Power Characteristic Test of Wind Turbine Generators Based on Nacelle Anemometer Method for Wind Power Generation Systems
(IEC 61400-12-2.2022, IDT)
GB/T 46242-2025 Power Characteristic Testing and Obstacle and Terrain Assessment for Wind Power Generation Systems (IEC 61400-12-5.2022)
IDT)
IEC 60688 Electrical measurement converters for converting AC and DC electrical quantities into analog or digital signals.
Note. GB/T 13850-1998 Electrical measuring transmitters that convert AC electrical quantities into analog or digital signals (IEC 688.1992, IDT)
IEC 61400-12-1 Wind power generation systems – Part 12-1.Test of power characteristics of wind turbine generators (Windenergygenera-
Note. GB/T 18451.2-2025 Power characteristic test of wind turbine generator sets for wind power generation systems (IEC 61400-12-1.2022, IDT)
IEC 61400-12-2 Wind power generation systems – Part 12-2.Power characteristic testing of wind turbine generators based on nacelle anemometer method
Note. GB/T 33225-2025 Power Characteristic Test of Wind Turbine Generators Based on Nacelle Anemometer Method (IEC 61400-12-2)
2022, IDT)
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