H - Electricity – 02 – P
Patent
H - Electricity
02
P
322/24
H02P 3/06 (2006.01) H02P 9/08 (2006.01)
Patent
CA 1090417
EXCITATION CONTROL APPARATUS SUITED FOR NORMAL STOP OPERATION OF SYNCHRONOUS GENERATORS ABSTRACT OF THE DISCLOSURE Disclosed is an apparatus for carrying out normal stop of a synchronous generator in an advantageous manner without use of a field breaker. The apparatus comprises a six-phase thyristor converter for controlling field excitation of the synchronous generator in dependence upon terminal voltage thereof, which converter exhibits not only a forward conversion function (power rectifier) but also backward conversion function (power inverter). When a generator operation stop command is produced, the operation of the converter in power rectifier mode is changed over to power inverter mode. During the inverter mode operation, when the terminal voltage of the synchronous generator becomes lower than a preset value, a pair of counter part thyristors among the thyristors constituting the converter are simultaneously fired to bring about a short-circuited state in the excitation circuit with all the firing pulses supplied to the other thyristors being suppressed, thereby to complete the stopping operation for the synchronous generator.
280498
Goto Masuo
Isono Akira
Kai Takaaki
Momochi Yasushi
Hitachi Ltd.
Kirby Eades Gale Baker
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