FEATURE SPONSOR
ANEMOMETERS
divided into three types of turbine, with ten of each type located on windfarms in one terrain class (flat, semi-complex, complex or offshore). The task of project partner DTU is to select the windfarms and to ensure that the existing measuring mast complies with IEC standards.
During the measuring phase, the iSpin NTF is first determined on flat terrain by means of either a measuring mast or the nacelle lidar system. This is repeated for the same turbine type at the other sites. The results are compared with each other and the resulting possibilities of measuring the performance curve are evaluated. For this evaluation, at least 12 months are required to record all typical annual wind conditions.
POWER CURVES WITH 30% LESS DISPERSION
iSpin-based power curves are 30% less scattered than conventional power curves. The reason for this is that the anemometers measure the wind directly where the power is generated.
iSpin measures the wind at the spinner where the prevailing wind conditions are more stable and predictable. In comparison to the free measurement of wind speed at a wind measuring mast located two to four rotor diameters away, the measurement in front of the wind turbine is only
affected by the shape of the spinner and by a reduction in the wind speed by the rotor (induction effect). Both effects can be easily corrected.
iSpin not only enables the detection of wind from a free direction of inflow, but also the logging of significant wind measurements considering all wind directions. In addition, iSpin records a variety of other variables that are important for the operation of wind turbines: horizontal and vertical oblique flow, turbulence intensities, nacelle alignment, air pressure and temperature.
RECOGNISING UNDERPERFORMERS AND INITIATING CORRECTIONS The advantages of a wind measurement system that is robust in terms of measurement characteristics and that can be used on all wind turbines would be considerable. The comparability of the performance curves produced by this method allows the identification of underperforming turbines and measures for optimisation to be initiated. These range from correcting yaw misalignments to curtail turbines to eliminate excess loads.
Another important application is the verification of the effects of modifications or manufacturer upgrades. The transparent processing of the data gives all parties the assurance that the measures
introduced were the right ones and that the successes they had hoped for will actually materialise.
MORE TRUST BETWEEN OEM AND CUSTOMERS
PTP has the potential to radically improve the level of trust between OEM and customers. Three independent reviewers, UL/DEWI, Deutsche Windguard and DNV-GL, will check and validate the collected data. The data collected by iSpin technology can thus be regarded as a manufacturer-independent data basis, which enables the seamless documentation of the performance of one particular type of wind turbine on a windfarm.
The rapid and reliable verification of modifications to turbines could also lead to new technologies in the field of wind energy and could gain ground more quickly. The project, which runs until mid-2019, is funded by the Danish EUDP (Energy Technology Development and Demonstration Programme).
Romo Wind A/S
WEBSITE
KNOWLEDGE
www.windenergynetwork.co.uk 55
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