IEC 61400-12-1:2017

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and units
5 Power performance method overview
6 Preparation for performance test
7 Test equipment
8 Measurement procedure
9 Derived results
10 Reporting format
Annex A (normative) - Assessment of influences
        caused by wind turbines and obstacles at the
        test site
Annex B (normative) - Assessment of terrain at
        the test site
Annex C (normative) - Site calibration procedure
Annex D (normative) - Evaluation of uncertainty
        in measurement
Annex E (informative) - Theoretical basis for
        determining the uncertainty of measurement
        using the method of bins
Annex F (normative) - Wind tunnel calibration
        procedure for anemometers
Annex G (normative) - Mounting of instruments
        on the meteorological mast
Annex H (normative) - Power performance testing
        of small wind turbines
Annex I (normative) - Classification of cup and
        sonic anemometry
Annex J (normative) - Assessment of cup and sonic
        anemometry
Annex K (normative) - In-situ comparison of
        anemometers
Annex L (normative) - The application of remote
        sensing technology
Annex M (informative) - Normalisation of power
        curve data according to the turbulence
        intensity
Annex N (informative) - Wind tunnel calibration
        procedure for wind direction sensors
Annex O (informative) - Power performance testing
        in cold climate
Annex P (informative) - Wind shear normalisation
        procedure
Annex Q (informative) - Definition of the rotor
        equivalent wind speed under consideration
        of wind veer
Annex R (informative) - Uncertainty considerations
        for tests on multiple turbines
Annex S (informative) - Mast flow distortion correction
        for lattice masts
Bibliography

IEC 61400-12-1:2017 specifies a procedure for measuring the power performance characteristics of a single wind turbine and applies to the testing of wind turbines of all types and sizes connected to the electrical power network. In addition, this standard describes a procedure to be used to determine the power performance characteristics of small wind turbines (as defined in IEC 61400-2) when connected to either the electric power network or a battery bank. The procedure can be used for performance evaluation of specific wind turbines at specific locations, but equally the methodology can be used to make generic comparisons between different wind turbine models or different wind turbine settings when site-specific conditions and data filtering influences are taken into account. This new edition includes the following significant technical changes with respect to the previous edition: new definition of wind speed, inclusion of wind shear and wind veer, revision of air density correction, revision of site calibration, revision to definition of power curve, interpolation to bin centre method, revision of obstacle model, etc.
Key words: Wind turbines, Wind energy, renewable energy, performance, efficiency
The contents of the corrigendum 1 of September 2019, corrigendum 2 of March 2020 and corrigendum 3 of May 2021 have been included in this copy.