Doubly-fed generators

The mainstream doubly-fed concept, using a high speed drivetrain, enables small generator size. It offers high system efficiency at nominal speed, because only a small converter (1/3 Pn) is needed. The system also satisfies the basic grid code requirements. ABB has a strong back round of designing and delivering doubly-fed generators since 1997 ensuring reliability of operations.

Key benefits:

Proven reliability - maximized profitability
  • Rotor with high overspeed withstand
  • Insulation against converter voltage peaks
  • Slip ring design for long service intervals
  • Bearing design avoiding circulating currents

Low cost of ownership (purchase - running - downtime)

  • Globally identical manufacturing
  • High availability and > 97 % efficiency
  • Easy serviceability and local support

Our offering

The DF generator (DFIG) is an asynchronous wound rotor slip ring machine where the rotor windings are connected to a converter via slip rings and brushes. The generator feeds power both from the stator and from the rotor. The doubly-fed converter (1/3 Pn) is smaller compared to a full converter, however even with this smaller converter the generator speed, power and power factor can be controlled to reach power yield with low LCoE.  The doubly-fed concept has ability to feed reactive power to support the grid and satisfy basic grid code requirements.

The proven ABB doubly-fed generators has been designed to fit most turbines used today. The standard modular structure - with both air or water cooling - can be modified for different turbine interface connections. The generator features a rigid rotor design for higher overspeed and voltage peak withstand to fit most converter designs used in the markets. The advanced ABB slip ring series is designed for long service life and easy maintenance. Customer specific generators are available by request from 2 MW up to 6 MW.


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