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BS EN IEC 61400-12-3:2022 Wind energy generation systems - Power performance. Measurement based site calibration, 2022
- undefined [Go to Page]
- Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
- English [Go to Page]
- CONTENTS
- FOREWORD
- INTRODUCTION
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Symbols, units and abbreviated terms
- 5 General
- 6 Overview of the procedure
- Figures [Go to Page]
- Figure 1 – Site calibration flow chart
- 7 Test set-up [Go to Page]
- 7.1 Considerations for selection of the test wind turbine and location of the meteorological mast [Go to Page]
- 7.1.1 General
- 7.1.2 Type A:
- 7.1.3 Type B:
- 7.1.4 Type C:
- 7.2 Instrumentation
- Figure 2 – Terrain types
- 8 Data acquisition and rejection criteria
- 9 Analysis [Go to Page]
- 9.1 General
- 9.2 Assessment of site shear conditions [Go to Page]
- 9.2.1 Shear calculations and characterisation plots
- 9.2.2 Assess significance of shear
- 9.2.3 Establish correlation of shear between locations
- 9.3 Method 1: Bins of wind direction and wind shear
- 9.4 Method 2: Linear regression method where wind shear is not a significant influence
- 9.5 Additional calculations
- 10 Site calibration uncertainty [Go to Page]
- 10.1 Site calibration category A uncertainty [Go to Page]
- 10.1.1 Site calibration K-fold analysis
- 10.1.2 Site calibration statistical uncertainty for each fold
- 10.2 Site calibration category B uncertainty [Go to Page]
- 10.2.1 General
- 10.2.2 Anemometer – Pre-calibration
- 10.2.3 Anemometer – Post-calibration
- 10.2.4 Anemometer – Classification
- 10.2.5 Anemometer – Mounting
- 10.2.6 Anemometer – Data acquisition
- 10.2.7 Anemometer – Lightning finial
- 10.3 Combining uncertainties in the wind speed measurement from flow distortion due to site calibration uVT,i
- 10.4 Combined uncertainty
- 11 Quality checks and additional uncertainties [Go to Page]
- 11.1 Convergence check
- 11.2 Correlation check for linear regression (see 9.4)
- 11.3 Change in correction between adjacent wind direction bins [Go to Page]
- 11.3.1 General
- 11.3.2 Removal of the wind direction sensor between site calibration and power performance test
- 11.4 Site calibration and power performance measurements in different seasons
- Annex A (informative)Verification of results [Go to Page]
- Figure A.1 – Example of the results of a verification test
- Annex B (informative)Site calibration examples [Go to Page]
- B.1 Example A [Go to Page]
- B.1.1 Site description:
- B.1.2 Site calibration setup:
- B.1.3 Site calibration evaluation:
- B.1.4 Step 1: Check the significance of wind shear at the site according to 9.2.2:
- B.1.5 Step 2: Verify correlation of wind shear at wind turbine and reference meteorological mast locations – Example A
- Figure B.1 – Wind shear exponent vs. time of day, Example A
- Figure B.2 – Wind shear exponents at wind turbine location vs. reference meteorological mast, example A where the colour axis = wind speed (m/s) [Go to Page]
- B.1.6 Step 3: Calculate results according to 9.2.3
- B.1.7 Step 4: Quality checks and additional uncertainties
- Figure B.3 – Wind speed ratios and number of data points vs. wind shear exponent and wind direction bin – wind speed ratios (full lines), number of data points (dotted lines)
- Tables [Go to Page]
- Table B.1 – Site calibration flow corrections (wind speed ratio)
- Table B.2 – Site calibration data count
- B.2 Example B [Go to Page]
- B.2.1 Site description:
- B.2.2 Site calibration setup:
- Figure B.4 – Data convergence check for 190° bin [Go to Page]
- B.2.3 Step 1: Check the significance of wind shear at the site:
- B.2.4 Step 2A: Verify correlation of wind shear at wind turbine and reference meteorological mast locations, example B
- Figure B.5 – Wind shear exponent vs. time of day, example B
- Figure B.6 – Wind shear exponents at wind turbine location vs. reference meteorological mast, example B
- Figure B.7 – Linear regression of wind turbine location vs. reference meteorological mast hub height wind speeds for 330° bin
- Figure B.8 – Wind speed ratios vs. wind speed for the 330° bin [Go to Page]
- B.2.5 Step 2B: Attempt to remove non-correlating wind shear data
- Figure B.9 – Wind speed ratios vs. wind shear for the 330° bin
- Figure B.10 – Wind shear exponents at wind turbine location vs. reference meteorological mast post-filtering [Go to Page]
- B.2.6 Step 3: Calculate results
- B.2.7 Step 4: Additional uncertainties:
- Figure B.11 – Linear regression of wind turbine location vs. reference meteorological mast hub height wind speeds for 330° bin, post-filtering
- Figure B.12 – Wind speed ratios vs. wind speed for the 330° bin, post-filtering
- Figure B.13 – Data convergence check for 330° bin
- Table B.3 – r2 values for each wind direction bin
- Table B.4 – Additional uncertainty due to change in bins for example B
- B.3 Example C [Go to Page]
- B.3.1 Site description:
- B.3.2 Site calibration setup:
- Figure B.14 – Site calibration wind shear vs. power curve test wind shear [Go to Page]
- B.3.3 Step 1: Check the significance of wind shear at the site:
- B.3.4 Step 2: Verify correlation of wind shear at wind turbine and reference meteorological mast locations, example C
- B.3.5 Step 3: Calculate results
- B.3.6 Step 4: Quality checks and uncertainty
- B.3.7 Anemometer operational uncertainty:
- B.3.8 Convergence check:
- B.3.9 Change in magnitude of correction between bins:
- B.3.10 Wind vane adjustment:
- B.3.11 Seasonal uncertainty adjustment:
- Figure B.15 – Convergence check for 270° bin
- Table B.5 – Additional uncertainty due to change in bins for example C
- Bibliography [Go to Page]
