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One approach to allowing wind turbine speed to vary is to accept whatever frequency the generator produces, convert it to DC, and then convert it to AC at the desired output frequency using an inverter. This is common for small house and farm wind turbines. But the inverters required for megawatt-scale wind turbines are large and expensive.
For variable speed wind turbines, one of two types of generators can be used: a DFIG (doubly fed induction generator) or an FRC (fully rated converter). A DFIG generator draws reactive power from the transmission system; this can increase the vulnerability of a transmission system in the event of a failure.
For wind turbines, the FRT testing is described in the standard IEC 61400-21 (2nd edition August 2008). More detailed testing procedures are stated in the German guideline FGW TR3 (Rev. 22). Testing of devices with less than 16 Amp rated current is described in the EMC standard IEC 61000-4-11 [ 13 ] and for higher current devices in IEC 61000-4-34.
The generator, which is approximately 34% of the wind turbine cost, includes the electrical generator, [64] [65] the control electronics, and most likely a gearbox (e.g., planetary gear box), [66] adjustable-speed drive, or continuously variable transmission [67] component for converting the low-speed incoming rotation to high-speed rotation ...
This is useful for wind turbines, because you can electrically rotate the field and change the output frequency and phase of the generator somewhat. Without that, synchronous wind turbines have to be physically locked to the grid frequency, which is hard on the machinery as the wind changes. John Nagle 08:02, 2 January 2016 (UTC)
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California fires weather forecast: 'Dangerous' wind situation begins early Tuesday. News. BBC. Maps and images reveal scale of LA wildfire devastation. Sports. Sports. USA TODAY Sports.
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