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Wind turbines - Part 21: Measurement and assessment of power quality characteristics of grid connected wind turbines
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Available format(s): Hardcopy, PDF 1 User, PDF 3 Users, PDF 5 Users, PDF 9 Users
Superseded date: 31-12-2021
Language(s): English - French, Spanish, Castilian
Published date: 13-08-2008
Publisher: International Electrotechnical Committee
FOREWORDINTRODUCTION1 Scope2 Normative references3 Terms and definitions4 Symbols and units 5 Abbreviations6 Wind turbine power quality characteristic parameters 6.1 General 6.2 Wind turbine specification 6.3 Voltage fluctuations 6.3.1 General 6.3.2 Continuous operation 6.3.3 Switching operations 6.4 Current harmonics, interharmonics and higher frequency components 6.5 Response to voltage drops 6.6 Active power 6.6.1 Maximum measured power 6.6.2 Ramp rate limitation 6.6.3 Set-point control 6.7 Reactive power 6.7.1 Reactive power capability 6.7.2 Set-point control 6.8 Grid protection 6.9 Reconnection time7 Test procedures 7.1 General 7.1.1 Test validity 7.1.2 Test conditions 7.1.3 Test equipment 7.2 Wind turbine specification 7.3 Voltage fluctuations 7.3.1 General 7.3.2 Fictitious grid 7.3.3 Continuous operation 7.3.4 Switching operations 7.4 Current harmonics, interharmonics and higher frequency components 7.5 Response to temporary voltage drop 7.6 Active power 7.6.1 Maximum measured power 7.6.2 Ramp rate limitation 7.6.3 Set point control 7.7 Reactive power 7.7.1 Reactive power capability 7.7.2 Set point control 7.8 Grid protection 7.9 Reconnection time8 Assessment of power quality 8.1 General 8.2 Voltage fluctuations 8.2.1 General 8.2.2 Continuous operation 8.2.3 Switching operations 8.3 Current harmonics, interharmonics and higher frequency components Annex A (informative) Sample report formatAnnex B (informative) Voltage fluctuations and flickerAnnex C (informative) Measurement of active power, reactive power and voltageBibliography
IEC 61400-21:2008 covers the 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; and procedures for assessing compliance with power quality requirements, including estimation of the power quality expected from the wind turbine type. The main changes with respect to the previous edition deal with interharmonics and current distortions (
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