Relevance of Averaging Period to Wind Power Measurements and Efficiency of Wind Energy Conversion Systems (Wecs)

摘要

The 10 min averages of wind speed, wind speed cubed, and power output are used for the determination of power curves and power coefficient of wind energy conversion systems and turbulence intensity. It is shown that the turbulent part of the air flow at the Pellworm (Germany) test field contains 16% of the mean flow energy. Neglecting the turbulent part in determining the power coefficient or power curve leads to an error in the calculation of the mean energy output at locations with a different turbulence intensity. Averaging the third power of the instantaneous wind speed is recommended.