WIND MONITORING
FEATURE SPONSOR
A DAY TO REMEMBER IN THE WORLD OF WIND MONITORING?
On the 3rd of March 2017 the international standards and conformity assessment body for all fields of electrotechnology, the International Electrotechnical Commission (IEC), published a new standard to deliver the technical basis for the acceptance of lidar measurements for wind turbine power performance testing and wind resource assessments
CONTINUOUS WAVE LIDARS
Continuous Wave Lidars, such as ZephIR 300, deliver remote wind measurements from just 10 metres above the ground, up to 200 metres and above without the need of a conventional tall met mast. Planning permits required for tall structures are reduced and working at height Health & Safety considerations are removed. Lidars are also extremely mobile expanding the number of measurements that can be taken across a site.
MAJOR MILESTONE
The release of the new standard, IEC 61400-12-1:2017, is considered a major milestone in lidar’s growing maturity,
formally allowing lidar as a supplementary or alternative measurement technique to mast-mounted cup anemometers. That in itself is significant, but there are further implications: this is the culmination of effort within the wind industry as it strives to evolve into a mature business. This IEC guidance recognises the decoupling of the relationship between a cup anemometer at hub height and the full swept area of the electricity- generating turbine.
ROTOR EQUIVALENT WIND SPEED (REWS)
The guidance introduces the ‘REWS’ concept that looks at the turbine performance relative to the wind shear and veer profile across the swept area.
It makes sense, especially when looking at ever-larger blade lengths and hub heights. It was not always popular for us, a lidar manufacturer, to say so but it really is beginning to look like the wind energy industry is outgrowing cup and mast anemometry.
WIDER IMPLICATIONS
The guidance itself has wider implications – for all who use it in anger know very well it isn’t just about power performance measurements, it underpins all wind resource assessment measurements involved in the estimation of annual energy production.
It is a guidance for ‘good’ wind measurement principles and in the build up to its release have seen the
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