šŸ”„šŸ”„ Donā€™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.

šŸ”
BS EN IEC 61400-12-2:2022

BS EN IEC 61400-12-2:2022

$215.11

Wind energy generation systems – Power performance of electricity producing wind turbines based on nacelle anemometry

Published By Publication Date Number of Pages
BSI 2022 86
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. Weā€™re here to assist you 24/7.
Email:[email protected]

IEC 61400-12-2:2022 specifies a procedure for verifying the power performance characteristics of a single electricity-producing, horizontal axis wind turbine that is not considered to be a small wind turbine per IEC 61400-2. It is expected that this document be used when the specific operational or contractual specifications do not comply with the requirements set out in IEC 61400-12-1. The purpose of this document is to provide a uniform methodology of measurement, analysis, and reporting of power performance characteristics for individual electricity producing wind turbines utilising nacelle-anemometry methods. This document is intended to be applied only to horizontal axis wind turbines of sufficient size that the nacelle-mounted anemometer does not significantly affect the flow through the turbineā€™s rotor and around the nacelle and hence does not affect the wind turbineā€™s performance. This second edition of IEC 61400-12-2 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 61400ā€‘12ā€‘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
5 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
7 English
CONTENTS
10 FOREWORD
12 INTRODUCTION
14 1 Scope
2 Normative references
15 3 Terms and definitions
19 4 Symbols, units and abbreviated terms
22 5 Overview of test method
23 Figures
Figure 1 ā€“ Procedural overview
24 6 Preparation for performance test
6.1 General
6.2 Wind turbine
6.3 Test site
25 6.4 Nacelle wind speed transfer function
6.5 Test plan
7 Test equipment
7.1 Electric power
26 7.2 Wind speed
7.3 Wind direction
7.4 Air density
27 7.5 Rotor speed
7.6 Pitch angle
7.7 Wind turbine status
7.8 Data acquisition
28 8 Measurement procedure
8.1 General
8.2 Wind turbine operation
8.3 Data system(s) synchronisation
29 8.4 Data collection
8.5 Data quality check
8.5.1 General
8.5.2 Measured signals are in range and available
8.5.3 Sensors are operating properly
30 8.5.4 Ensure data acquisition system(s) is/are operating properly
8.5.5 Sector self-consistency check
8.6 Data rejection
31 8.7 Data correction
8.8 Database
32 9 Derived results
9.1 Data normalisation ā€“ Density correction
33 9.2 Determination of measured power curve
9.3 Annual energy production (AEP)
34 9.4 Power coefficient
35 9.5 Uncertainty analysis
10 Reporting format
39 Figure 2 ā€“ Presentation of sample data: nacelle power performance test scatter plots
Figure 3 ā€“ Presentation of sample data: binned power curve with uncertainty bands
40 Figure 4 ā€“ Example of sample data: measured power curve and Cp curve
41 Tables
Table 1 ā€“ Example of a measured power curve
42 Table 2 ā€“ Example of estimated annual energy production
43 Annexes
Annex A (normative) Nacelle wind speed transfer function validity procedure
A.1 General
A.2 Measurement procedure:
A.3 Terrain class and slope:
A.4 Measurement hardware:
A.5 Other turbine hardware:
44 A.6 Turbine controls:
45 Annex B (normative) Evaluation of uncertainty in measurement
B.1 General
B.2 The measurands
B.3 Uncertainty components
46 Table B.1 ā€“ Uncertainty components in nacelle power curve evaluation
47 B.4 Wind direction uncertainty
Table B.2 ā€“ Uncertainty components in nacelle based absolute wind direction
48 Annex C (normative) Theoretical basis for determining the uncertainty of measurement using the method of bins
C.1 General
49 C.2 Propagation of uncertainty through the stages of NTF/NPC measurement
50 Table C.1 ā€“ Example cancellation sources
52 C.3 Category A uncertainties
C.3.1 General
C.3.2 Category A uncertainty in electric power
53 Table C.2 ā€“ List of category A and B uncertainties for NPC
54 C.4 Category B uncertainties
C.4.1 General
C.4.2 Category B uncertainties in climatic variations
C.5 Expanded uncertainty
55 Table C.3 ā€“ Expanded uncertainties
56 Annex D (normative) NPC uncertainty estimates and calculation
D.1 Methods and assumptions
D.1.1 General
D.1.2 Nacelle power curve uncertainty component estimates
57 Table D.1 ā€“ Estimates for uncertainty components from NPC measurement
59 D.1.3 Wind direction uncertainty
Table D.2 ā€“ Estimates for uV5,i for NPC terrain class
60 D.1.4 Contribution factors
Table D.3 ā€“ Estimates for uncertainty components for wind direction
61 Table D.4 ā€“ Estimates for contribution factors for NPC
62 D.2 Uncertainty example calculations
D.2.1 Example description
D.2.2 Example case ā€“ NTF uncertainty
63 D.2.3 Example case ā€“ NPC uncertainty
65 Annex E (normative) Allowable anemometry instrument types
E.1 General
E.2 Calibration of sonic anemometers
E.2.1 General
E.2.2 Step 1: Wind speed calibration (required)
66 E.2.3 Step 2: Wind direction calibration (required)
E.2.4 Step 3: Tilting test (recommended)
E.3 Recalibration of sonic anemometers
E.4 Uncertainty of sonic and propeller anemometers
67 Annex F (informative) Results and uncertainty considerations
F.1 General
F.2 Method for calculation of measurement uncertainty
71 F.3 Method for calculation of sampling uncertainty
F.4 Combined measurement and sampling uncertainty
72 Annex G (informative) Example multi-turbine NTF/NPC uncertainty calculation
G.1 Overview
G.2 Outline of procedure:
73 Table G.1 ā€“ List of correlated uncertainty components
75 G.3 Example of measurement uncertainty calculation
Table G.2 ā€“ Sample AEP and uncertainty data from three turbines
76 Table G.3 ā€“ Component uncertainty contribution to AEP uncertainty on turbine 1
77 Table G.4 ā€“ Combination of uncertainty components across turbines
79 G.4 Example of sampling uncertainty calculation
G.5 Combined uncertainty
G.6 Discussion of sample size and uncertainty
Figure G.1 ā€“ Impact of multiple turbine testing on measurement uncertainty
80 Figure G.2 ā€“ Impact of multiple turbine testing on sampling uncertainty
81 Annex H (informative) Organisation of test, safety and communication
H.1 Overview
H.2 Responsibility for test
H.3 Safety during test
H.4 Communication
H.5 Prior to test
H.6 During test
82 H.7 After test
83 Bibliography

Related products

BS EN IEC 61400-12-2:2022
$215.11