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Power Performance Measurements Using Remote Sensing

Luke Simmons, Megan Quick, Anna Marsh, and Scott George (DNV KEMA)

Poster, AWEA 2014

Published on May 5, 2013

Related Products: Windcube® Lidar

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Many studies have demonstrated that the use of a single hub-height wind speed measurement does not accurately represent the available energy across a large turbine rotor under varying inflow conditions. In response, the Committee Draft for Vote of the International Electrotechnical Commission standard 61400-12-1 Ed. 2 (CDV 12-1 Ed. 2) provides several definitions for wind speed to account for new measurement technology and larger rotor diameters. A rotor equivalent wind speed (REWS) has been introduced which requires measurement of horizontal wind speed at a minimum of three points across the rotor height. This study presents a comparison of REWS power curves with hub-height wind speed (HHWS) power curves as described in CDV 12-1 Ed. 2. The impact of using these two methods under different turbulence intensities (TI) is presented in terms of annual energy production (AEP). Other considerations for implementation of the REWS defined in CDV 12-1 Ed. 2 are discussed including costs and logistics of utilizing remote sensing devices (RSD) for power performance measurements.