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10 months ago in Wind Energy By Akash

Why is the converter in a dfig only 30% of the generator rating?

In a doubly-fed induction generator, the stator connects directly to the grid. The rotor connects through a converter rated at only ~30% of the generator's power. How is that possible?

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By Krirthi Answered 8 months ago

Because the converter only handles slip power—the difference between mechanical speed and synchronous speed. In a DFIG, the rotor speed typically varies within ±30% of synchronous. That means only ~30% of the total power flows through the rotor circuit. The stator, directly connected, handles the rest. Smaller converter = lower cost, lower losses. It's the genius of the DFIG: big generator, small electronics.

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