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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