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Power Performance Testing 
A power curve is a graph that shows how much power is produced by a wind turbine at different wind speeds. Turbine manufacturers
supply "reference" power curves for their turbines, to show how the
turbine is expected to perform for given wind speeds.An actual power curve is created by measuring and averaging the wind speed at the turbine's location and the power output of the turbine every ten minutes. The data is then binned by windspeeds. For example, for every ten minute period when the wind speed average was 14 mph, the power produced during that time period is binned, and then an average power output for that wind speed is calculated. The average power is plotted against wind speed to produce a curve like the one shown above. To measure a turbine's power curve to IEC specifications, you will need to collect wind speed, wind direction, power output of the turbine, the turbine's on/off status, temperature, and pressure. The Nomad 2 data logger will measure all of these parameters, and meets the IEC specifications for power performance testing. The Nomad 2 will sample data every second, and average the values every ten minutes. Once collected, the data is binned and averaged, and plotted against the expected power curve. This can be performed automatically by the Nomad Desktop software program using the Power Curve Graph feature. Nomad Desktop software is included with the purchase of a Nomad 2 data logger from Second Wind Inc. |
 
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