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A wind turbine generator drive must cope with

  • A.a constant input power whatever the wind speed
  • B.an input that requires four-quadrant motoring capability
  • C.a load torque that is entirely independent of speed
  • D.a power that varies with the cube of the wind speed

Answer: D

The available power rises steeply with wind speed, and the rotor is held at the tip speed ratio that extracts the most from it, which means variable-speed operation. Above rated wind the blades are pitched to shed the surplus.

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