The annual output of a wind turbine is quite straightforward to calculate. It is based on the average wind speed, the average air density, the rated output of the generator and the length of rotor blades. The graph shows how annual energy production in million kilowatt hours varies with the windiness of the site. When it comes to choosing a site, the energy output can will be proportional to the average wind speed at the height of the turbine. For instance, a mean wind speed of 6.75 m/s would generate approximately 1.5 million kilowatt hours (kWh) of energy per year.
Energy output will vary roughly along the line of the cube of the wind speed. Exactly how sensitive the energy output of a turbine is to changes in wind speed varies with the wind probability distribution (see Weibull distribution).
|Rated power||1500 kW|
|Cut-in wind speed||4 m/s|
|Rated wind speed||14 m/s|
|Cut-off wind Speed||20 m/s|
|Survival wind speed||52.5 m/s|
The S82-1.5 MW has a well-suited ratio between rotor diameter and generator for most sites in a medium wind speed regime. The wind turbine concept is based on robust design and is efficiently handled by the Suzlon controller. These technologies are all well-known in the wind power industry and have proven themselves over time.
Note the above capacities are till March 31,2010 and since then the wind capacity has risen by another 1200 MW to reach 13 GW.According to MNRE a total capacity of 13284 MW has been established up to February, 2011, mainly in Tamil Nadu, Gujarat, Maharashtra, Andhra Pradesh, Karnataka and Rajasthan. Wind electric generators of unit sizes between 225 kW and 2.1 MW have been deployed across the country.