Third harmonic auxiliary commutated inverter having selectable c

Details Third harmonic auxiliary commutated inverter having selectable c Third harmonic auxiliary commutated inverter having selectable c

1979-08-30

1981-01-06

Beha, Jr., William H.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

363 49, H02M 7515, H02M 106

Patent

active

042440173

ABSTRACT:
Three pairs of series-connected inverter main thyristors are coupled in parallel across a unidirectional current source with the junction between thyristors of each pair being adapted for coupling to a respective phase of a three phase wye-connected inductive load. A first and second pair of serially-connected auxiliary thyristors are coupled in parallel across the current source, with the junction between thyristors of the first and second auxiliary pairs coupled by a first and second commutating capacitance, respectively, to the load neutral. Control means, responsive to conduction of a main thyristor, render a respective one of the thyristors of the first and second auxiliary thyristor pairs conductive in accordance with inverter load current to commutate a conductive main thyristor by coupling a respective one of the first and second commutating capacitances in series with a respective load phase across the conductive main thyristor. Inverter commutation capacitance is thus varied in accordance with load current, thereby extending inverter operating range and reducing likelihood of inverter commutation failure.

REFERENCES:
patent: 4180853 (1979-12-01), Scorso et al.
patent: 4191994 (1980-03-01), Kratz et al.

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