what is the optimum wind speed to generate electricity by a wind turbine?
It depends on the capacity of the generator. In general, the output power increases with respect to increase in wind velocity. The wind turbine operates at its rated wind speed to avoid the fluctuation in the grid and to limit the rpm within the maximum capacity of the generator. The rated wind speed and rated power or maximum power is shown in the figure, above this speed blade pitch adjusted to maintain a constant rpm to meet generator capacity.
Hi,
To build on the previous explanations, there are also turbines optimized for low wind speeds, that have cut-in speeds as low as 3 m/s or even lower, and that may have rated (nominal) speeds of around 6 or 6.5 m/s.
As you can see, the optimum wind speed to generate electricity with a wind turbine is relative: there are many wind turbine models suitable to very diverses wind speed values, but typically rated speeds range from 6 to 15 m/s.
Jose
As per IEC norms rated wind speed can be determined by multiplying by 1.4 to annual average speed for the location. Generally annual average speed of 5 m/s or more is acceptable for large wind peed installation. For large wind turbines rated wind speed is considered as 12 m/s. for SWT it is 9 to 12 m/s. I am considering the rated wind speed of 8.4 m/s (6.0 X 1.4) for my all most designs. I feel it is optimum and give realistic results close to actual field results.
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