Low-speed full converter electrical drivetrain package

ABB’s offering for low-speed full converter concepts includes permanent magnet generators and full power converters suitable for onshore or offshore turbines. Generator stator contactors and main circuit breakers complete the ABB drivetrain offering.

Full converter concept

In the full converter concept, the converter decouples the generator and the mechanical drivetrain from the grid. All of the generated power flows through the converter to the grid. Synchronous (permanent magnet) and asynchronous generators are typically used. The converter provides the generators torque and speed control.

Advantages compared to the doubly-fed concept:

  • Decouples the generator from the grid
  • Reduces mechanical shocks on the turbine during grid faults
  • Increases grid code compliance
  • Enables full speed range
  • Increases annual power yield
  • Full reactive power production
  • Full control of the power

Low-speed full converter concept

The low-speed full converter (LSFC) concept, also known as the gearless direct-drive concept, uses a large diameter, low-speed generator (up to 30 rpm). Permanent magnet or separately excited synchronous generators are typically used.


  • No gearbox

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