GB/T 33225-2025Wind energy generation systems - Power performance of electricity producing windturbines based on nacelle anemometry (English PDF)

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).