Transformers, Motors & Generators

This module is designed to present an overview of transformers, AC motors and the most common generators found in large wind turbines. The basic operating principles of transformers are presented along with their applications in wind turbines and wind farms.  Also included in this module is the fundamentals of AC motors and AC variable speed control systems.  In addition to the basic induction motor, the module also convers synchronous and asynchronous machines.  Generator types, including the doubly fed induction generator (DFIG) are discussed in detail along with an explanation of the necessity for power factor control.

Learning Outcomes

Upon completion of this module the student will be able to:

  • Explain the basic operating principle of transformers
  • List the standard markings used to identify transformer polarity
  • Name three types of transformers used in wind farms
  • Describe the operation of induction motors
  • Differentiate between synchronous and asynchronous machines
  • Define starting torque and breakdown torque
  • Describe how torque is developed in a 3-phase induction motor
  • Calculate synchronous speed
  • Name the main components in AC motor speed control
  • Differentiate between yaw drive and pitch drive systems
  • List the three types of generators used in wind turbines
  • Describe operation of a doubly fed induction generator (DFIG)
  • Explain why power factor control is required with AC generators
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