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The display includes walkways that align with the wind turbine's shadow at solar noon and two hours, eleven minutes after solar noon, respectively. On the vernal and autumnal equinoxes, the wind turbine's shadow also aligns with the walkways by length. [29] Thus the wind turbine functions as a large gnomon in an incomplete sundial. The display ...
The rotor diameter varies amongst particular versions of turbines. The diameter for version C89 is 89 meters, 93 meters for version C93, 96 meters for version C96, and 99 meters for C99. Blade lengths are 43.2m for C89, 45.2m for C93, 46.7m for C96 and 48.2m for C100. Liberty Wind Turbines use 4 generators that have permanent magnets.
The Blue Creek Wind Farm spanning Paulding and Van Wert County became the largest wind farm in the U.S. state of Ohio at approximately 40,500 acres upon its completion in 2012. With a generating capacity of 304 megawatts (MW), it produces enough electricity to service the equivalent of about 76,000 homes.
Permanent magnets for wind turbine generators contain rare-earth metals such as neodymium (Nd), praseodymium (Pr), terbium (Tb), and dysprosium (Dy). Systems that use magnetic direct drive turbines require greater amounts of rare-earth metals. Therefore, an increase in wind turbine manufacture would increase the demand for these resources.
This is useful for large variable speed wind turbines, because wind speed can change suddenly. When a gust of wind hits a wind turbine, the blades try to speed up, but a synchronous generator is locked to the speed of the power grid and cannot speed up. So large forces are developed in the hub, gearbox, and generator as the power grid pushes back.
The fixed speed wind turbines without a power converter (also known as "Type 1" and "Type 2" [5]) cannot be used for voltage control. They simply absorb the reactive power (like any typical induction machine), so a switched capacitor bank is usually used to correct the power factor to unity. [7] Capability curve of a photovoltaic generator
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