Inverter control system

Details Inverter control system Inverter control system

H - Electricity

02

M

321/24, 321/96

H02M 1/08 (2006.01) H02M 7/162 (2006.01) H02M 7/757 (2006.01) H02M 7/515 (2006.01)

Patent

CA 1078921

INVERTER CONTROL SYSTEM Abstract of the Disclosure An inverter in a D.C. power transmission system is controlled by gate pulses which are synchronized with voltages of an A.C. system and whose interval is constant for respective arms of the inverter. To prevent the inverter from causing a commutation failure upon occurrence of a fault in the A.C. system, a control voltage for the gate pulses is corrected by use of the magnitude of the unbalance of the phase difference between the voltages of the A.C. system. The control voltage becomes greater, as the phase voltage or the line to line voltage falls from the rated voltage. When the control voltage increases, the gate pulses are provided at a timing having a larger advanced control angle so as to maintain the extinction angle constant.

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