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The presence of the AC source inductance often makes the forced commutation scheme difficult to apply to AC/DC and AC/AC thyristor converters. This paper proposes a novel forced commutation method based on the voltage injection technique which handles the inductive energy in the same manner as achieved with the line commutation. A comparative analysis with the conventional capacitor-type commutation shows that the new method is capable of commutating higher load current with less thyristor voltage, commutation time and commutation power. A simple but effective pulse-width controlled AC/DC converter with the new method is also presented with experimental results.

A new method of forced commutation for thyristor converters having AC source inductance.