Converter for wind turbines with a doubly-fed induction generator (DFIG) up to 6.6 MW
A dual-channel frequency converter for wind turbines with a doubly-fed induction generator (DFIG) of up to 6.6 MW. The range runs from 850 kW to 6.0 MW, with liquid cooling and forced air. For new turbines and for replacing converters on turbines in operation.
- Wind turbine power
- up to 6.6 MW
- DFIG DAC family range
- 850 kW; 2.6; 3.4; 4.5; 6.0 MW
- Ambient temperature
- up to 50 °C
- Cooling
- liquid + forced air
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
DFIG converters are intended for wind turbines with a doubly-fed induction generator. The generator stator is connected directly to the grid, and the rotor is fed from a dual-channel frequency converter through which only part of the turbine power passes. This arrangement allows operation at variable rotational speed, control of active and reactive power, and compliance with grid code requirements with a relatively small installed converter power.
The DFIG DAC family covers converters for turbines of 850 kW, 2.6, 3.4 and 4.5 MW. The newest model, DFIG 6.0, is designed for wind turbines up to 6.6 MW. The converters operate at ambient temperatures up to 50 °C. Cooling is combined, liquid with forced air, so the high-power cabinets do not need a separate heat exchange circuit on the turbine site. The stator delivers most of the power to the grid without conversion, so losses in the converter are lower than in a full-conversion scheme. The size of the converter is determined only by the share of power passing through the rotor. It controls the rotor current and maintains the required generator mode as wind speed changes.
The basis of the converter is the CCU control unit of in-house design, proven in service. According to the manufacturer, its mean time between failures (MTBF) is 40 years, based on statistics from more than 2000 units and more than 40 million operating hours. The manufacturer has supplied more than 65 GW of converters for wind power.
The generator plus converter systems are tested on the company's own test benches in Madrid with a capacity of up to 10 MW, including full-power benches of 3.5 and 6 MW with a virtual 50/60 Hz grid. The benches are used to check ride-through of voltage dips and overvoltages (LVRT/HVRT), operation in weak grids, PQVf characteristics, thermal modes, efficiency and harmonics. The converters for wind turbines are manufactured in Valencia.
Applications are megawatt-class wind turbines with doubly-fed generators, and modernisation and replacement of converters on turbines in operation. When replacing, the turbine power, generator parameters and local grid code requirements are matched.
Technical specifications
| Wind turbine power | up to 6.6 MW |
|---|---|
| DFIG DAC family range | 850 kW; 2.6; 3.4; 4.5; 6.0 MW |
| Ambient temperature | up to 50 °C |
| Cooling | liquid + forced air |
| Control unit | CCU of in-house design (MTBF 40 years according to the manufacturer) |
| Experience | more than 65 GW of converters for wind turbines |
Request a price and lead time
Converter for wind turbines with a doubly-fed induction generator (DFIG) up to 6.6 MW. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Questions and answers
Which wind turbines are these converters suitable for?
For wind turbines with a doubly-fed induction generator of up to 6.6 MW. The DFIG DAC family covers turbines of 850 kW, 2.6, 3.4 and 4.5 MW.
What cooling and temperature range do the converters have?
Cooling is combined, liquid with forced air. Ambient temperature is up to 50 °C.
How are the converters tested?
On the company's own benches in Madrid with a capacity of up to 10 MW, including full-power benches of 3.5 and 6 MW with a virtual 50/60 Hz grid. LVRT/HVRT, operation in weak grids, efficiency and harmonics are checked.
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