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Variable-speed operation of a wind turbine is used in order to

  • A.hold the optimum tip speed ratio as the wind changes
  • B.keep the generator at exactly synchronous speed
  • C.reduce the torque the gearbox has to transmit
  • D.avoid the need for any pitch control of the blades

Answer: A

Aerodynamic efficiency peaks at one ratio of blade tip speed to wind speed, and tracking it across the wind range recovers several per cent more energy over a year. Pitch control still handles the region above rated wind.

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