S E S Pf U

Where S(P); is the power error band (computed from S;) for a given confidence level and f (U;) is the annual probability of the wind being in the ith bin. It should be noted that this treatment only deals with random errors (referred to as category A uncertainties by the IEC) and that the effect of bias errors associated with the instruments and other factors (category B uncertainties) should be included separately. The RISO work concluded that the testing procedures were not accurate enough to identify with confidence differences in performance of less than 5 percent.

The current IEC standard presents a detailed methodology for analysing how errors propagate through the power curve to the energy yield calculations. Because of its importance, the approach is outlined here.

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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