Halt Sequence for Matrix Converter Connected to Permanent Magnet Synchronous Motor during Regeneration

Abstract

This paper proposes a halt sequence for a matrix converter to overcome the over-voltage and over-current problems in the case of system failure during regeneration. A short-circuit operation is performed in order to prevent the regenerating current from flowing into the snubber capacitor. In addition, the motor current is then interrupted the current by the natural turn-off of the freewheeling diode at the current zero-crossing point. The experimental results demonstrated a rise in the snubber voltage that was less than 10% of the rated voltage.