Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1991-09-16
1994-05-03
Voeltz, Emanuel T.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
323207, 307102, 307105, 361 93, 361111, H02H 7125, H02M 118
Patent
active
053093461
ABSTRACT:
A fault current surge bypassing and transitional impedance compensation system for preventing subsynchronous currents on electrical power lines, with parallel lines being protected from the clearing of transient faults. Capacitor banks serve as only a partial solution to the disturbances with transient faults during conventional recovery modes of operation. The fault current bypassing and impedance compensation system, coupled in series to each transmission line, clears a transmission line fault current and dynamically balances the inductor impedance on the transmission line after the fault mode clears when a return is made to the normal mode of operation. A circuit based solid-state switching power converter or "voltage-sourced inverter" with self-commutating GTO semiconductor switches is used, having all GTOs switched-on and maintained in this condition for the fault current to pass. A parallel circuit shunting arrangement for each GTO with a reverse poled freewheeling diode provides multiple fault current paths which return to the normally switched operational GTO mode, providing a transitional return to transient and dynamic stability without fostering synchronous resonance.
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Voeltz Emanuel T.
Westinghouse Electric Corp.
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