Overvoltage protection in series thyristor string for static var

Details Overvoltage protection in series thyristor string for static var Overvoltage protection in series thyristor string for static var

1990-04-11

1992-03-03

Beha, Jr., William H.

Electricity: power supply or regulation systems

For reactive power control

Using impedance

363 68, G05F 170

Patent

active

050936301

ABSTRACT:
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 predetermined period while reverse-phase sides of the antiparallel-connected thyristors are held in conduction periods, respectively. The gate pulse generator prolongs an active period of a forward conduction period signal by the predetermined period. Upon switching from in-phase conduction to reverse-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.

REFERENCES:
patent: 3958172 (1976-05-01), Beck
patent: 4325114 (1982-04-01), Kobayashi et al.
patent: 4337430 (1982-06-01), Flego
patent: 4571535 (1986-02-01), Gyugyi
patent: 4797587 (1989-01-01), Tschudi et al.
patent: 4859884 (1989-08-01), Yoshino

Affiliated with

Also associated with

Rating

Overvoltage protection in series thyristor string for static var does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Overvoltage protection in series thyristor string for static var, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Overvoltage protection in series thyristor string for static var will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-274607