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GB/T 33225-2025: Wind energy generation systems - Power performance of electricity producing windturbines based on nacelle anemometry
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GB/T 33225: Evolution and historical versions
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| GB/T 33225-2025 | English | 1314 |
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Wind energy generation systems - Power performance of electricity producing windturbines based on nacelle anemometry
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GB/T 33225-2025
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| GB/T 33225-2016 | English | 1714 |
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Electricity producing wind turbines -- Power performance measurements based on nacelle anemometry
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GB/T 33225-2016
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PDF similar to GB/T 33225-2025
Basic data
| Standard ID | GB/T 33225-2025 (GB/T33225-2025) |
| Description (Translated English) | Wind energy generation systems - Power performance of electricity producing windturbines based on nacelle anemometry |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | F11 |
| Classification of International Standard | 27.180 |
| Word Count Estimation | 66,610 |
| Date of Issue | 2025-10-05 |
| Date of Implementation | 2026-05-01 |
| Older Standard (superseded by this standard) | GB/T 33225-2016 |
| Issuing agency(ies) | State Administration for Market Regulation and Standardization Administration of China |
GB/T 33225-2025: Wind energy generation systems - Power performance of electricity producing windturbines based on nacelle anemometry
---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/GBT33225-2025
ICS 27.180
CCSF11
National Standards of the People's Republic of China
Replaces GB/T 33225-2016
Wind power generation systems based on nacelle anemometer method
Wind turbine generator power characteristic test
anemometry (IDT)
Released on October 5, 2025; to be implemented on May 1, 2026.
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 and abbreviations 5.
5.Test Methods 8.
6.Preliminary preparations for power characteristic testing 9.
6.1 Basic Requirements 9
6.2 Wind turbine generator set 10
6.3 Test Site 10
6.4 Nacelle wind speed transfer function 10
6.5 Test Plan 11
7.Testing equipment 11
7.1 Electrical power 11
7.2 Wind speed 11
7.3 Wind direction 11
7.4 Air density 11
7.5 Wind turbine speed 12
7.6 Pitch angle 12
7.7 Wind Turbine Generator Status 12
7.8 Data Acquisition 12
8 Measurement Procedure 13
8.1 Basic Requirements 13
8.2 Wind turbine generator operation 13
8.3 Data System Synchronization 13
8.4 Data Collection 13
8.5 Data Quality Verification 14
8.6 Data Removal 14
8.7 Data Correction 15
8.8 Database 15
9.Exported Results 16
9.1 Data Normalization - Density Correction 16
9.2 Determination of the power measurement curve 16
9.3 Annual power generation 17
9.4 Power factor 18
9.5 Uncertainty Analysis 18
10 Report Format 18
Appendix A (Normative) Procedure for the Validity of the Cabin Wind Speed Transfer Function 24
A.1 General Requirements 24
A.2 Measurement Procedure 24
A.3 Topographical Classification and Slope 24
A.4 Measurement Hardware 24
A.5 Other Wind Turbine Generator Hardware 24
A.6 Wind turbine generator control 24
Appendix B (Normative) Measurement Uncertainty Assessment 26
B.1 General Rule 26
B.2 Test Subject 26
B.3 Uncertainty Components 26
B.4 Wind direction uncertainty 27
Appendix C (Normative) Theoretical Basis for Determining Measurement Uncertainty Using the Interval Method 29
C.1 Overview 29
C.2 Propagation of Uncertainty in the NTF/NPC Measurement Phase 30
C.3 Type A uncertainty 32
C.4 Type B uncertainty 33
C.5 Expanded uncertainty 34
Appendix D (Normative) NPC Uncertainty Assessment and Calculation 35
D.1 Methods and Assumptions 35
D.2 Uncertainty Example 40
Appendix E (Normative) Permitted Types of Anemometers 42
E.1 General Requirements 42
E.2 Ultrasonic Anemometer Calibration 42
E.3 Recalibration of the ultrasonic anemometer 43
E.4 Uncertainty of ultrasonic anemometers and propeller anemometers 43
Appendix F (Informative) Results and Uncertainty Considerations 44
F.1 General Rule 44
F.2 Calculation method for measurement uncertainty 44
F.3 Sampling Uncertainty Calculation Method 46
F.4 Combined measurement and sampling uncertainty 47
Appendix G (Informative) Example of Calculating NTF/NPC Uncertainty for Multiple Wind Turbine Generators 48
G.1 General Rule 48
G.2 Step Summary 48
G.3 Calculation of Measurement Uncertainty Example 51
G.4 Sampling Uncertainty Example 54
G.5 Combined uncertainty 54
G.6 Discussion on Sampling Sample Size and Uncertainty 54
Appendix H (Informative) Organizations involved in testing, safety, and communication 56
H.1 General Provisions 56
H.2 Responsibility for Testing 56
H.3 Safety during testing 56
H.4 Communication 56
H.5 Test Pre-56
H.6 during testing 56
H.7 test results. 56
Reference 57
Figure 1.Flowchart of the NPC testing method.
Figure 2 Scatter plot of nacelle power characteristic test 21
Figure 3.Interval power curves and uncertainty bands 21
Figure 4 Measured Cp curve 22
Figure G.1 Impact of multi-unit testing on measurement uncertainty 55
Figure G.2 Impact of Multiple Unit Testing on Sampling Uncertainty 55
Table 1 Example 22 of measured power curves
Table 2 Example 23 of Estimating Annual Power Generation
Table B.1 Uncertainty components for cabin power curve assessment 26
Table B.2 Uncertainty components based on absolute wind direction in the cabin 28
Table C.1 Example 30 of the offset source
Table C.2 List of Type A and Type B Uncertainties for NPC 32
Table C.3 Expanded Uncertainty 34
Table D.1 Evaluation of NPC Measurement Uncertainty Components 35
Table D.2 Evaluation of NPC Terrain Level uV5,i 37
Table D.3 Evaluation of wind direction uncertainty components 38
Table D.4 Evaluation of the contribution factor of the nacelle power curve (NPC) 39
Table G.1 List of Correlation Uncertainty Components 49
Table G.2 Uncertainty data and AEP calculation example for three wind turbine generator sets 51
Table G.3 Wind Turbine Generator Sets
This document replaces GB/T 33225-2016 "Power Characteristic Test of Wind Turbine Generator Sets Based on Nacelle Anemometer Method", and is consistent with...
Compared with GB/T 33225-2016, apart from structural adjustments and editorial changes, the main technical changes are as follows.
---Terrain classification has been removed (see 6.3.1 in the.2016 version);
---The RIX index has been removed (see 6.3.2 in the.2016 version);
---The mean tilt angle has been removed (see 6.3.3 in the.2016 version);
---The determination of terrain classification has been removed (see 6.3.4 in the.2016 version);
---The spine has been removed (see 6.3.5 in the.2016 version);
---The installation of cabin equipment has been removed (see Appendix A of the.2016 edition);
---The sector measurement program has been removed (see Appendix B of the.2016 edition);
---The test procedure for the nacelle wind speed transfer function has been removed (see Appendix D of the.2016 edition).
This document is equivalent to IEC 61400-12-2.2022 "Wind power generation systems - Part 12-2.Wind power generation based on nacelle anemometer method".
Power characteristic test of motor set.
The following minimal editorial changes have been made to this document.
---To align with existing standards, the standard title has been changed to "Power of Wind Turbine Generators Based on Nacelle Anemometer Method for Wind Power Generation Systems".
Feature testing.
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. China Electric Power Research Institute Co., Ltd., Huaneng Shanwei Wind Power Generation Co., Ltd., and Shanghai Electric Wind Power Group.
Joint-stock companies, Fudan University, CSSC Offshore & Marine Engineering Wind Power Co., Ltd., Windey Energy Technology Group Co., Ltd., CRRC Shandong Wind Power Co., Ltd.
The company, Beijing Certification Center Co., Ltd., Wind Power Division of CRRC Zhuzhou Electric Locomotive Research Institute Co., Ltd., and Goldwind Technology Co., Ltd.
The company, Mingyang Smart Energy Group Co., Ltd., Hunan Xinglan Wind Power Co., Ltd., China Quality Certification Center Co., Ltd., and Qianjiang District of Chongqing.
Three Gorges New Energy Power Generation Co., Ltd., Envision Energy Co., Ltd., and Sinovel Wind Group Co., Ltd.
The main drafters of this document are. Qin Shiyao, Wu Xurui, Wang Lijuan, Wang Anqing, Zhu Zhiquan, Gong Wei, Wang Ruiliang, Li Zhongli, Pang Mengzhi, and Jia Haikun.
Yang Liu, Ma Lijuan, Wei Yufeng, Tang Jun, Huang Jiewei, Wang Ying, Bai Han, Zhang Zhaozhi, Chen Mingliang, Bian Wei.
The release history of this document and the document it replaces is as follows.
---First published in.2016 as GB/T 33225-2016;
---This is the first revision.
Wind power generation systems based on nacelle anemometer method
Wind turbine generator power characteristic test
1.Scope
This document describes a method for verifying the power characteristics of a single horizontal axis wind turbine generator, excluding small wind turbines covered by IEC 61400-2.
Power generator sets. This document is used when specific operating conditions or contractual stipulations do not meet the requirements of IEC 61400-12-1.
This document is applicable to evaluating the power characteristics of specific wind turbine generators in specific geographical locations, and is also applicable to different types or settings.
A routine comparison was conducted on the wind turbine generator sets.
This document aims to provide a unified method for testing, analyzing, and reporting the power characteristics of a single wind turbine generator set using a nacelle anemometer.
This document applies only to large-sized horizontal-axis wind turbine generators, whose nacelle anemometers are for wind turbine blades and the area around the nacelle.
The airflow has no significant impact, and therefore does not affect the characteristics of the wind turbine generator. This document aims to address the issue of not meeting the requirements of IEC 61400-12-1.
The methods proposed in this document must be used when required. This ensures the consistency and accuracy of test results under current testing technology and equipment conditions.
Accuracy and repeatability.
This document describes how to characterize the power characteristics of wind turbine generators by measuring power curves and estimating annual power generation, and provides a comprehensive overview of...
This document outlines considerations for uncertainty calculations during single-unit power performance testing of wind turbines in a wind farm. It also provides guidelines for calculating uncertainties when testing multiple wind turbines.
Guidelines for estimating combined uncertainty during generator set testing.
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 46242-2025 Power Characteristic Testing and Obstacle and Terrain Assessment for Wind Power Generation Systems (IEC 61400-12-5.2022)
IDT)
GB/T 46246-2025 Wind energy resources of wind power generation systems based on wind measurement equipment installed on wind measurement towers, nacelles and fairings
Measurement (IEC 61400-50-1.2022, IDT)
ISO 2533 Standard Atmosphere
Note. GB/T 27418-2017 Evaluation and expression of measurement uncertainty (ISO /IEC Guide 98-3.2008, MOD)
Note. CNAS-CL01 Accreditation Criteria for Testing and Calibration Laboratories (ISO 17025.2017, IDT)
ISO /IEC Guide 98-3.2008 Measurement uncertainty - Part 3.Guidelines for the expression of measurement uncertainty (GUM.1995) [Un-
1995)
IEC 60688 Electrical measuring transmitters that convert 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-
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