FEATURE SPONSOR Quantity Wind speed GENERATING IMPROVED


RETURNS FOR THE WHOLE WIND INDUSTRY


Turbulence intensity Flow inclination


Yaw misalignment


COST OPTIMISATION Conventional nacelle anemometry iSpin


Transfer Function (“TF”) sensitive to different inflow conditions


No possibility to measure No possibility to measure


Indirect measurement, very sensitive to measurement position


TF shows robustness even in wake and across different terrain


Key capability of iSpin Key capability of iSpin


Key capability of iSpin


Table 1: Measurement capability of nacelle anemometer and spinner anemometer iSpinDue to its unique position and measurement principle in front of the rotor it is possible to overcome many of the limitations of conventional nacelle anemometry.


THE NEED TO KNOW


Customers and manufacturers (OEMs) need to know how efficiently a WTG converts energy from given wind conditions. This power performance characteristic expressed as electrical power (output) versus horizontal wind speed (input) is called a power curve. Verifying that a new WTG operates


according to the OEMs’ power curve specification is surprisingly difficult using conventional technology. Often either no verification is conducted or measurements are performed only at dedicated turbines, nearest a reference met mast. The results from the limited verification process then are assumed representative not only for the individual WTG, but for all WTGs of the evaluated windfarm.


Monitoring that WTGs continue to perform within specification is again surprisingly difficult using conventional technology because of the imprecision of the wind speed measurement system.


A SOLUTION … THE ISPIN GUARDIAN APPROACH


Following IEC 61400-12 standards for performance measurement, using an accredited 3rd party consultant and processes shown below, a WTG model performance characteristic including a tolerance band can be generated which, after some plausibility checks, can be used for fleet wise evaluation of the WTG performance. Creating such performance transparency and reducing measurement uncertainties in this way could influence OEM performance warranties and has the potential to allow financiers and insurers to reduce risk premiums in their business calculations; generating improved returns for the whole wind industry….all from a simple improvement in measuring the wind!


Figure 2: Process flow for iSpin Guardian approach Warranties Scope Time Verification Offered today Single power curve Campaign, e.g. after commissioning


1 or 2 WTGs with met mast (sample) Only WTGs with free wind sector Only simple or semi-complex terrain


Table 2: Performance transparency and effect on warranties Technically possible


Single power curve Windfarm power curve


Minimum variance among WTGs Maximum power curve degradation


WTG life time All WTGs in windfarm


ISPIN GUARDIAN…


• Comparable precision power curves on all turbines in your windfarm at any time during its life; from commissioning, warranted verification and throughout operation


• Low-cost performance


management and optimisation of your windfarm


• Quickly detect changes in the performance of your turbines compared to…


• Warranted Power Curves (IEC compliance)


• Average performance for the turbine type (in your windfarm or benchmarked against other windfarms )


• Others in the windfarm (underperformers)


• Time (power curve degradation or improvement)


• Reliably detect underperformers– don’t waste resources on false positives (from inaccurate wind measurements)


• Eliminate yaw misalignment and other damaging wind conditions


Nigel Parlor UK, Ireland & Benelux Business Manager


ROMO Wind SCAN/CLICK SCAN/CLICK


MORE INFO


MORE INFO


www.windenergynetwork.co.uk


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