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Technical Brief

Experimental assessment of wakes based on time-resolved and SCADA data: A case study of an onshore wind farm in Italy

[+] Author and Article Information
Francesco Castellani

Department of Engineering, University of Perugia, via G. Duranti 93, Perugia 06125, Italy
francesco.castellani@unipg.it

Paolo Sdringola

Department of Engineering, University of Perugia, via G. Duranti 93, Perugia 06125, Italy
paolo.sdringola@unipg.it

Davide Astolfi

Department of Engineering, University of Perugia, via G. Duranti 93, Perugia 06125, Italy
davide.astolfi@unipg.it

1Corresponding author.

ASME doi:10.1115/1.4039347 History: Received September 13, 2017; Revised January 30, 2018

Abstract

An experimental study is conducted on wind turbine wakes and their effects on wind turbine performances and operation. The test case is a wind farm located on a moderately complex terrain, featuring 4 turbines with 2 MW of rated power each. Two inter-turbine distances characterize the layout: 4 and 7.5 rotor diameters. Therefore, it is possible to study different levels of wake recovery. The processed data are twofold: time-resolved series, whose frequency is in the order of the Hz, and SCADA data with 10 minutes of sampling time. The wake fluctuations are investigated adopting a "slow" point of view (SCADA), on a catalogue of wake events spanned over a long period, and a "fast" point of view of selected time-resolved series of wake events. The power ratios between downstream and upstream wind turbines show that the time-resolved data are characterized by a wider range of fluctuations with respect to the SCADA. Moreover, spectral properties are assessed on the basis of time-resolved data. The combination of meandering wind and yaw control is observed to be associated to different spectral properties depending on the level of wake recovery.

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