IS/IEC 61400 : Part 21 : Sec 1 : 2019 Wind Energy Generation Systems - Part 21 Measurement and Assessment of Electrical Characteristics - Section 1 Wind Turbines
FOREWORD
This Indian Standard (Part 21/Sec 1) which is identical to IEC 61400-21-1 : 2019 ‘Wind energy generation systems - Part 21-1: Measurement and assessment of electrical characteristics - Wind turbines’ issued by the International Electrotechnical Commission (IEC) was adopted by the Bureau of Indian Standards on the recommendation of the Wind Turbines Sectional Committee and approval of the Electrotechnical Division Council.
This standard was first published in 2014 identical to IEC 61400-21 : 2008. This revision has been undertaken to align this standard with the latest international practices.
This edition includes the following new items with respect to IS/IEC 61400-21 : 2008:
a) Frequency control measurement;
b) Updated reactive power control and capability measurement, including voltage and cos ö control;
c) Inertia control response measurement;
d) Overvoltage ride through test procedure;
e) Updated undervoltage ride through test procedure based on wind turbine capability; and
f) New methods for the harmonic assessment.
Parts of the assessments related to the wind power plant evaluation are moved to Annex E, as they will be replaced by IEC 61400-21-2, Measurement and assessment of electrical characteristics - Wind power plants.
The text of the IEC standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:
a) Wherever the words ‘International Standard’ appears referring to this standard, they should be read as ‘Indian Standard’; and
b) Comma (,) has been used as a decimal marker, while in Indian Standards the current practice is to use a point (.) as the decimal marker.