EN 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
Annex ZA (normative) - Normative references to
         international publications with their
         corresponding European publications

NEW!IEC 61400-12-1:2017 is available as IEC 61400-12-1:2017 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC61400-12-1:2017 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 IEC61400-2) 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