Abstract
This paper proposes an FRT (fault ride through) control method for a multi-modular matrix converter operating under short voltage sag to prevent the unexpected acceleration of the generator. The proposed method uses an external braking circuit and feedback controls to obtain a generator torque same as that before the voltage sag. From experimental results, the proposed method maintains the generator torque to -1.07 p.u. and injects a grid reactive current of 0.60 p.u. during the voltage sag.
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