Saturday, December 1, 2012

Notes - Chapter 11 Summary

The following notes are taken from Wind Turbine Technology by Ahmad Hemami.
  • Direct Current generators only used in small isolated turbines
    • Electricity can be stored in batteries
    • Direct drive is when a generator is directly connected to turbine without gearbox
  • Motor and Generator have the same structure
  • Industrial Turbines always use three-phase alternating current generators
    • Synchronous Generators
      • must operate at the synchronous speed
      • fixed speed mode and variable speed mode
    • Asynchronous Generators
      • also called an induction generator
      • squirrel cage generators, run in only one mode of operation
      • wound-rotor induction generators
        • connect to outside circuit with slip rings and brushes
        • run in variable slip mode
        • turbines with doubly fed induction generators
      • don't run at synchronous speed
        • generators must run at slightly higher speed
        • motors run at a slightly lower speed

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