H - Electricity – 02 – J
Patent
H - Electricity
02
J
323/20
H02J 3/18 (2006.01) G05F 1/45 (2006.01) G05F 1/70 (2006.01) H02M 1/088 (2006.01) H03K 5/151 (2006.01) H03K 17/0812 (2006.01)
Patent
CA 2014313
A gate pulse generator for a static var compensator (SVC) constituted by a thyristor switched capacitor (TSC) comprises voltage detectors for respectively detecting forward and reverse voltages applied to antiparallel-connected thyristors in the TSC. The antiparallel-connected thyristors comprise a plurality of series-connected forward thyristors and a plurality of series-connected reverse thyristors. The gate pulse generator monitors the forward and reverse voltages and determines whether a period in which both the forward and reverse voltages are zero continues for a pre- determined period while reverse-phase sides of the antiparallel-connected thyristors are held in conduction periods, respectively. The gate pulse generator pro- longs an active period of a forward conduction period signal by the predetermined period. Upon switching from in-phase conduction to revese-phase conduction, even if some of the plurality of series-connected thyristors are turned off, these thyristors are turned on again within the predetermined period, and an overvoltage is not applied to these thyristors.
Kabushiki Kaisha Toshiba
Marks & Clerk
LandOfFree
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