Working of DFIG converters

Question

Accepted Answer

DFIG converters are used in wind turbines to convert variable frequency AC power to DC power and back to AC power.

DFIG stands for Doubly Fed Induction Generator
The converter consists of two back-to-back voltage source converters
One converter controls the rotor current and the other controls the grid current
The rotor current is controlled to maintain a constant torque on the turbine
The grid current is controlled to maintain a constant voltage and frequency on the grid
DFIG converters allow for variable speed operation of wind turbines
They are more efficient than fixed speed turbines
DFIG converters require less maintenance than other types of wind turbines

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