Selective commutation for an inverter

Details Selective commutation for an inverter Selective commutation for an inverter

1980-12-23

1982-06-22

Shoop, William M.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363136, H02P 1300

Patent

active

043365850

ABSTRACT:
A selective commutation technique used with an inverter eliminates one of the two commutation pulses at those points at which there is a particular relationship of inverter operating characteristics. The power factor angle .theta., the voltage phase angle .delta., and the voltage pattern notch angle .beta. are sensed to determine this particular relationship. Because at the switching point there is no current flowing through the gated thyristor, the gated thyristor can then be transitioned to the nonconducting state merely by the removal of its gate signal. A single makeup pulse is then rung through the system to initialize the commutation capacitors for the next switch point.

REFERENCES:
patent: 3641421 (1972-02-01), Graf et al.
patent: 4131937 (1978-12-01), Pelly et al.
patent: 4180853 (1979-12-01), Scorso, Jr. et al.
patent: 4204268 (1980-05-01), Vivirito
patent: 4225912 (1980-09-01), Messer
patent: 4255783 (1981-03-01), Messer

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