Dynamic voltage sag correction

Details Dynamic voltage sag correction Dynamic voltage sag correction

2011-04-05

2011-04-05

Behm, Harry (Department: 2838)

Electric power conversion systems

Current conversion

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

C323S208000, C307S105000

Reexamination Certificate

active

07920392

ABSTRACT:
A voltage sag correction device includes an input terminal adapted to receive a first operating signal having a line-to-neutral voltage. The first operating signal is provided to a load through an output terminal. A regulator module includes a rectifying device adapted to rectify a line-to-line input signal, a storage unit adapted to store energy corresponding to the rectified line-to-line input signal, and an inverter switching device adapted to use the stored energy to generate a correction signal during at least a portion of a voltage sag. An injection transformer in electrical communication with the regulator module is adapted to reduce a voltage of the correction signal. A bypass switch is in a closed position during a normal operating condition such that the injection transformer is bypassed. The bypass switch is in an open position during at least a portion of the voltage sag such that the injection transformer is energized.

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Po-Tai Cheng et al., “A transformer inrush mitigation method for series voltage sag compensators”, IAS 2005, vol. 2, pp. 881-888, Oct. 2005.
Visser, A.J. et al., “Direct-coupled cascaded multilevel sag compensator”, PESC 2000, vol. 1, pp. 463-469, Jun. 18-23, 2000.
International Search Report and Written Opinion for International Application No. PCT/US2008/063067 dated Oct. 28, 2008.

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