Ammonit
Ammonit
headmot_en_02.swf
state of the art measurement equipment for the wind industry
since 1989, marketed in more than 100 countries
Impact of Measurement Errors on AEP Calculation

Temperature and air pressure significantly affect the AEP (Annual Energy Production). Hence, according to IEC 61400-12-1 temperature and air pressure have to be measured in a wind measurement campaign.

Wind power is linear proportional to the invers of temperature 1/T (in Kelvin). At 15°C, 1°C error on temperature measurement induces 0.35% error on AEP. The standard IEC 61400-12-1 specifies the relation where the sensitivity factor for temperature is cT,i Pi / 288.15 K.

Therefore IEC 61400-12-1 requires measuring air pressure and temperature.

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The impact of humidity on AEP might be significant if air temperature is high. At sea level and at air temperature of 20°C, air density varies 1.2% between 0 … 100% humidity. It varies 2.0% at 30°C and 4% at 40°C. At high temperatures the IEC recommends to measure the humidity, as well.

  

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