Method and apparatus to avoid commutation failure in a regenerat

Details Method and apparatus to avoid commutation failure in a regenerat Method and apparatus to avoid commutation failure in a regenerat

1989-05-11

1990-01-16

Wong, Peter S.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

363 51, 363138, H02M 544, H02H 700

Patent

active

048947628

ABSTRACT:
A method and apparatus to avoid commutation failure in a regenerative converter of a supply reversible converter of a voltage-source converter, in case of dynamic voltage depression. A firing control of the reversible converter is a function of the value of a link current setpoint of the voltage-source converter. The link current setpoint is determined from a measured link voltage actual value and from a determined link voltage setpoint. A measured link current actual value is monitored for overcurrent. Control signals are supplied to the reversible converter even when there is an overcurrent status message, when the reversible converter is switched over. The reversible converter of the voltage-source converter is thereby protected from commutation failure.

REFERENCES:
patent: 3737763 (1973-06-01), Chadwick
patent: 4028607 (1977-06-01), Watanabe
patent: 4161010 (1979-07-01), Mann et al.
patent: 4183081 (1980-01-01), Cutler et al.
patent: 4208691 (1980-06-01), Rogowsky
patent: 4238821 (1980-12-01), Walker

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