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High speed permanent magnet generators

In full converter ( FC ) concept, using standard high speed drivetrain with PM generators, enables the smallest size and a very high efficiency at all speeds.

Unlike DF, in FC concept all the generated power goes through a converter. It offers full variable speed operation and advanced grid code compliance also in the future, fully separating the mechanical drivetrain from the grid disturbances.

ABB has delivered several types of HS PMG (high speed permanent magnet generator) designs to leading turbine manufacturers since 2003.

Benefits:

Proven reliability - maximized profitability

  • Short circuit withstand without demagnetization
  • Rotor with high overspeed endurance
  • Bearing design avoiding circulating currents

Low cost of ownership (purchase - running - downtime)

  • Globally identical manufacturing 
  • High availability and superior efficiency  > 98 % 
  • Minimum service requirements and local support

Technical data for high speed permanent magnet generators

Frame size
500, 560 and 710
Power
1.5 to 7.9 MW
Efficiency at rated speed
Up to 98% ( > 97% down to 20% load)
Cooling
air or water cooling
Mounting and protection
IM1001 (inclined 4...6 deg), IP54
Voltage
690 V, 1000 V, 3.3 kV
Frequency
50 and 60 Hz
Rated speed options
Between 1000...1800 rpm
Operation speed range
0...2000 rpm
Max. overspeed
up to 2500 rpm (depending on size)
Insulation class /Temp. rise
F/B and F/F
Typical dimensions with water
cooling (L x W x H, weight)
2.5 MW: 2400 x 1700 x 1800; ~ 7 tn
3.0 MW: 2500 x 1700 x 2000; ~ 10 tn
5.0 MW: 3100 x 1800 x 2300; ~ 13 tn
7.0 MW: 3300 x 1800 x 2400; ~ 15 tn


ABB has 20 years of experience in PM Technology, which enables us to use optimized, cost-efficient low magnet mass designs and still offer the highest performance in the markets. Our HS PM rotor is designed for the highest fatigue and peak loads with overspeeds up to 3000 rpm. We use special magnet modules for maximum corrosion protection and reliable fastening of magnets. Our global, long-term supply agreements for magnet material secures capacity, availability and cost control.
Our 30 years of experience in demanding converter applications ensure full electrical compatibility for the generator-converter package.

The proven ABB family of 1.5 – 3.2 MW HS PMG 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. Patented ABB PM rotor technology has proven short circuit withstand without demagnetization. The design is rigid to withstand higher overspeeds. ABB HS PM generators offer reliable, cost-efficient solutions with fast delivery times.

Customer specific generators are available by request from 500 kW up to 7 MW.

High Speed drivetrain:
Using a proven standard high speed (HS) drivetrain provides flexibility in turbine concept selection. The HS PMG system is mechanically similar to doubly-fed one. It offers turbine OEM´s a fast-track from DF to gain all the benefits of full converter (FC) concept without extensive re-engineering. It enables easy logistics, assembly and low crane cost. Using same drivetrain for all turbine sizes also results in standardization and globally identical production lines.

The PM generator :
PM generators are synchronous machines with rotor windings replaced by permanent magnets. They need no separate excitation so rotor excitation losses – about 30% of total generator losses – are eliminated. This results in high power density and small size with the highest efficiency at all speeds, offering the maximum annual production of energy with the lowest lifetime cost.

Images

7.0 MW HS PMG, Standard series
5 MW HS PMG
3.6 MW HS PMG, Standard series
2.5 MW HS PMG, Custom series
PM rotor with proven short circuit withstand without demagnetization
Stator with high voltage insulation technology
Innovative contacless magnet encoder
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