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Self-Excited Induction Generator (SEIG)

An induction machine requires reactive power for excitation whether it operates as a generator or motor.

 In a grid-connected induction generator, it draws reactive power from the grid. A self-excited induction generator does not require an external power source to operate. 

It is used in small-scale power plants where the grid connection is not available.

Self Excited Induction Generator

In SEIG, a capacitor bank is used to provide the necessary reactive power for excitation. It is connected in delta configuration across the stator’s terminals.

 The prime mover rotates the rotor with enough speed to induce a voltage across the stator’s terminals.

 As a result, the capacitor current starts following providing the reactive power for the excitation. The capacitor also supplies reactive power to the load.

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