Thyristor power converter filter for excitation applications
AssigneeGeneral Electric Company
InventorsJordan B. Casteel, John E. Bittner
Life of this patent
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Abstract
An exciter system for the field of a synchronous generator excitation is provided. The exciter system includes an AC power source; a three-phase thyristor bridge having six legs, the three-phase bridge being connectable with the AC power source, and being adapted to provide a variable DC voltage output; a thyristor in each of the six legs of the three-phase bridge, wherein the thyristors provide a path for a device current; and a three-phase AC line filter series, including series resistive and capacitive elements across each phase of the AC power source and a plurality of bleed resistors, wherein at least one bleed resistor is connected to each AC input connection of the filter.
Claims16
A three-phase AC line filter for a three-phase thyristor bridge for excitation applications, the three-phase AC line filter comprising:
- input line connection terminals for connection to a three-phase AC power source;
- a plurality of circuits including a series resistive element and a series capacitive element, the elements being connected across the input line connection terminals;
- and
- a plurality of bleed resistors connected to each of the input line connection terminals.
An exciter system for the field of a synchronous generator excitation, the exciter system comprising:
- an AC power source;
- a three-phase bridge having six legs, the three-phase bridge being connectable with the AC power source, and being adapted to provide a variable DC voltage output;
- a thyristor in each of the six legs of the three-phase bridge, wherein the thyristors provide a path for a device current;
- and
- a three-phase AC line filter series, including series resistive and capacitive elements in delta configuration across each phase of the AC power source and a plurality of bleed resistors, wherein at least one bleed resistor is connected to each AC input connection of the filter.
A method for converting an AC voltage to a DC voltage using a three-phase bridge thyristor bridge to supply the field of a synchronous electrical generator, the method comprising:
- providing an AC power supply;
- triggering the thyristors when the AC power supply provides a positive voltage;
- controlling the firing of the thyristors to establish the level of a DC output;
- supplying a three-phase AC line filter;
- and
- using the line filter for protection on AC input transients and thyristor switching transients.
Dependencies are inferred from the claim text.