IEC 61400-12-1:2017

Overview

IEC 61400-12-1:2017 - "Wind energy generation systems - Part 12-1: Power performance measurements of electricity producing wind turbines" is the international procedure for measuring and reporting the power performance of a single wind turbine. Applicable to turbines of all types and sizes connected to the electrical network (and to small wind turbines connected to a network or battery bank per IEC 61400-2), this edition (Edition 2.0, 2017) with corrigenda (2019–2021) defines the methodology for site-specific performance tests and for making generic model-to-model comparisons when site and filtering effects are accounted for.

Key technical topics and requirements

• Scope and applicability: Measurement procedure for single-turbine power performance; covers both grid-connected turbines and defined small turbines on battery systems.
• Wind measurement fundamentals: New definitions and handling of wind speed, plus explicit inclusion of wind shear and wind veer effects. Guidance on meteorological mast setup, top- and side-mounted anemometers, remote sensing devices (RSDs) and rotor-equivalent wind speed (REWS).
• Data acquisition and instrumentation: Requirements for electrical power measurement, wind sensors, wind direction, air density, rotational speed, pitch, blade condition, turbine control monitoring and DAQ systems.
• Corrections and normalisation: Procedures for air density correction, turbulence normalisation, mast flow-distortion correction, wind shear/veer adjustments and site calibration to obtain a representative power curve.
• Power curve and derived results: Revised definition of the power curve, methods for determining measured power curves (including interpolation-to-bin-centre), annual energy production (AEP) estimation and power coefficient calculation.
• Site calibration and obstacle assessment: Detailed normative annexes for site calibration, terrain and obstacle influence assessment, and exclusion sectors.
• Uncertainty analysis and reporting: Comprehensive uncertainty evaluation methods (Category A/B), reporting formats and quality checks included in annexes.

Practical applications and who uses this standard

• Turbine manufacturers - verify declared power curves and validate design performance.
• Certification bodies and test laboratories - perform standardized power performance tests for type certification and quality assurance.
• Project developers and asset owners - estimate site-specific AEP and revenue projections with robust measurement-backed data.
• Consultants and researchers - compare turbine models, evaluate control settings and study environmental effects (shear, veer, turbulence).
• Grid operators and utilities - assess expected generation and integrate performance data into grid planning.

Related standards

• IEC 61400 series (other parts covering design requirements, small wind turbines, site assessment) - see specifically IEC 61400-2 for small wind turbine definitions referenced in this standard.

Keywords: Wind turbines, wind energy, renewable energy, power performance, turbine efficiency, power curve, IEC 61400-12-1.