Adjustable Speed Generators for Wind Turbines based on Doubly-fed Induction Machines and 4-Quadrant IGBT Converters Linked to the Rotor
نویسندگان
چکیده
Wind turbines are being built at power levels above 1.5 MW. Higher power levels are being anticipated for off-shore applications. To limit mechanical stresses and power surges in these high power systems speed control is necessary. The doubly-fed induction generator (DFIG) system is investigated as a viable alternative to adjust speed over a wide range while keeping cost of the power converters minimal. A four-quadrant IGBT ac-to-ac converter is used to feed power bi-directionally to the rotor circuit. Decoupled control of active and reactive power can be realized using the dynamic model of the DFIG. Simulations and measurements confirm the validity of the model and the viability of the DFIG wind turbine.
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