GB/T 46241-2025 Wind energy generation systems—Measurement based nacelle wind speed transfer function of electricity producing wind turbines

Scope

This document describes the measurement method for the cabin wind speed transfer function of a single horizontal-axis wind turbine. This document is applicable to the measurement of the cabin wind speed transfer function specified in IEC 61400-12-2, but not applicable to the measurement of the cabin wind speed transfer function of small wind turbines specified in IEC 61400-2. This document is used when the cabin wind speed transfer function is required for power characteristic testing in accordance with IEC 61400-12-2.
The wind speed measured at the cabin or hub of a wind turbine is affected by the rotor (i.e., the wind speed is accelerated or decelerated). In IEC 61400-12-2, the anemometer is located on a wind measurement tower, which is positioned between 2 and 4 times the rotor diameter upwind of the wind turbine being measured. This location allows for the direct measurement of "free" wind and minimizes interference from the rotor of the wind turbine being measured. In the procedures described in this document, the anemometer is located on or near the cabin of the wind turbine being measured. At this location, the wind speed measured by the anemometer is strongly affected by the rotor and cabin of the wind turbine being measured. The procedures in this document include methods for identifying and implementing appropriate corrections for the aforementioned interference, but note that these corrections will increase the measurement uncertainty compared to the strict measurement requirements of IEC 61400-12-1.
This document specifies how to characterize the cabin wind speed transfer function of a wind turbine based on the simultaneous measurement of the actual wind speed in the cabin and the free-stream wind speed (measured on a wind measurement tower) over a sufficiently long measurement period, thereby establishing a statistically significant database containing a series of wind speeds and different wind conditions and atmospheric conditions. Th

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