🔥🔥 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 61400-12-3:2022

BS EN IEC 61400-12-3:2022

$198.66

Wind energy generation systems – Power performance. Measurement based site calibration

Published By Publication Date Number of Pages
BSI 2022 52
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 61400-12-3:2022 specifies a measurement and analysis procedure for deriving the wind speed correction due to terrain effects and applies to the performance testing of wind turbines of all types and sizes connected to the electrical power network as described in IEC 61400‑12‑1. The procedure applies to the performance evaluation of specific wind turbines at specific locations. The purpose of this part of IEC 61400 is to provide a uniform methodology that will ensure consistency, accuracy and reproducibility in the measurement and analysis of a site calibration for use in the determination of the power performance of wind turbines. This document provides guidance in the measurement, analysis, and reporting of the site calibration for subsequent use in power performance testing for wind turbines. This first edition of IEC 61400-12-3 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 English
CONTENTS
11 FOREWORD
13 INTRODUCTION
14 1 Scope
2 Normative references
3 Terms and definitions
16 4 Symbols, units and abbreviated terms
18 5 General
19 6 Overview of the procedure
Figures
Figure 1 – Site calibration flow chart
20 7 Test set-up
7.1 Considerations for selection of the test wind turbine and location of the meteorological mast
7.1.1 General
7.1.2 Type A:
7.1.3 Type B:
21 7.1.4 Type C:
7.2 Instrumentation
Figure 2 – Terrain types
22 8 Data acquisition and rejection criteria
23 9 Analysis
9.1 General
9.2 Assessment of site shear conditions
9.2.1 Shear calculations and characterisation plots
9.2.2 Assess significance of shear
24 9.2.3 Establish correlation of shear between locations
25 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
26 9.5 Additional calculations
27 10 Site calibration uncertainty
10.1 Site calibration category A uncertainty
10.1.1 Site calibration K-fold analysis
28 10.1.2 Site calibration statistical uncertainty for each fold
29 10.2 Site calibration category B uncertainty
10.2.1 General
10.2.2 Anemometer – Pre-calibration
10.2.3 Anemometer – Post-calibration
10.2.4 Anemometer – Classification
30 10.2.5 Anemometer – Mounting
10.2.6 Anemometer – Data acquisition
31 10.2.7 Anemometer – Lightning finial
10.3 Combining uncertainties in the wind speed measurement from flow distortion due to site calibration uVT,i
32 10.4 Combined uncertainty
11 Quality checks and additional uncertainties
11.1 Convergence check
11.2 Correlation check for linear regression (see 9.4)
11.3 Change in correction between adjacent wind direction bins
11.3.1 General
33 11.3.2 Removal of the wind direction sensor between site calibration and power performance test
34 11.4 Site calibration and power performance measurements in different seasons
35 Annex A (informative)Verification of results
36 Figure A.1 – Example of the results of a verification test
37 Annex B (informative)Site calibration examples
B.1 Example A
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:
38 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)
39 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)
40 Tables
Table B.1 – Site calibration flow corrections (wind speed ratio)
Table B.2 – Site calibration data count
41 B.2 Example B
B.2.1 Site description:
B.2.2 Site calibration setup:
Figure B.4 – Data convergence check for 190° bin
42 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
43 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
44 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
45 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
46 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
47 B.3 Example C
B.3.1 Site description:
B.3.2 Site calibration setup:
Figure B.14 – Site calibration wind shear vs. power curve test wind shear
48 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:
49 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
50 Bibliography

Related products

BS EN IEC 61400-12-3:2022
$198.66