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Doubly-fed generators

The mainstream DF concept, using a standard 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 for this semi variable speed operation concept. The system also satisfies the basic grid code requirements.

ABB has delivered several types of DFIG (doubly fed induction generator) designs to leading turbine manufacturers since 1997.

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

Technical data for the ABB standard doubly-fed platform

Typical data of the AMK/L series < 3.5 MW
Frame / power 500: up to 2.2 MW
560: up to 3.2 MW
630: up to 3.6 MW
Efficiency at rated speed
appr. 97...97.5%
Cooling (air or water)
IC 616 /666, IC81/86W, SRU IC01/06
Mounting and protection
IM1001 (inclined 4...8 deg), IP54, SRU IP23
Voltage
690-1000 V +/-10%, 50 or 60 Hz
3-6 kV +/-10 %, 50 or 60 Hz (630 frame)
Locked rotor voltage
approx. 1800 V or 2000 V
Rated speed (typical)
1750 rpm, 1200 rpm (50 Hz)
2100 rpm, 1440 rpm (60 Hz)
Operation speed range 1000... 2000 rpm / 670...1330 rpm (50 Hz)
1200... 2400 rpm / 800...1600 rpm (60 Hz)
Max. overspeed 3000 / 2300 rpm depending on size
Power factor
p.f. 0.90 cap ...1.0 ... 0.90 ind
Insulation class / Temp. rise       
F / B (at Un, p.f. 0.95 cap and 40ºC), or F/F
Temperature range
-20ºC…+40ºC; extended -30ºC…+50ºC
Dimensions and weight
(depending on power)
500: L3150 x W1600 x H1850 mm, 6-6.7 tn
560: L3300 x W1650 x H2050 mm, 7-10 tn
630: L3500 x W1700 x H2250 mm, 9-12 tn

The DF generator (DFIG) is an asynchronous wound rotor slip ring machine where the rotor windings are connected to a small converter via slip rings and brushes. The generator feeds power both from the stator and also from the rotor. A small (1/3 Pn) converter can be used, because a speed range of +/- 30 % is sufficient for wind turbine applications. The converter enables control of the generator speed, power and power factor, thus giving a wider speed range and improving the energy yield and ability to feed reactive power to support the grid. The DF concept therefore represents an economical way of achieving semi-variable speed operation and satisfying basic grid code requirements.

The proven ABB family of 1.5 – 3.6 MW DF 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 new advanced ABB slip ring series is designed for long service life and easy maintenance.

Customer specific generators are available by request from 500 kW up to 6 MW.


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