NBN EN 61400-21 : 2010

INTRODUCTION
1 Scope
2 Normative references
3 Definitions
4 Symbols and units
5 Abbreviations
6 Wind turbine power quality characteristic parameters
  6.1 General
  6.2 Rated data
  6.3 Maximum permitted power
  6.4 Maximum measured power
  6.5 Reactive power
  6.6 Voltage fluctuations
  6.7 Harmonics
7 Measurement procedures
  7.1 General
  7.2 Rated data
  7.3 Maximum permitted power
  7.4 Maximum measured power
  7.5 Reactive power
  7.6 Voltage fluctuations
  7.7 Harmonics
8 Assessment of power quality
  8.1 General
  8.2 Steady-state voltage
  8.3 Voltage fluctuations
  8.4 Harmonics
Annex A (informative) Sample report format
Annex B (informative) Voltage fluctuations and flicker
Annex ZA (normative) Normative references to international
                       publications with their corresponding
                       European publications
Bibliography

Includes: - definition and specification of the quantities to be determined for characterizing the power quality of a grid connected wind turbine; - measurement procedures for quantifying the characteristics; - procedures for assessing compliance with power quality requirements, including estimation of the power quality expected from the wind turbine type when deployed at a specific site, possible in groups.