Active filter for single-phase overhead contact wire energized l

Details Active filter for single-phase overhead contact wire energized l Active filter for single-phase overhead contact wire energized l

1993-08-23

1996-05-28

Sterrett, Jeffrey L.

Electricity: power supply or regulation systems

For reactive power control

Using converter

363 40, 363 71, G05F 170

Patent

active

055214878

ABSTRACT:
An active filter for filtering the current and optionally improving the power factor of a single-phase overhead contact wire energized locomotive includes an arrangement for collecting the voltage supplied by the overhead contact wire and for distributing voltages to the traction equipment and auxiliary equipment of the locomotive. It also includes two or more forced switching mode bridge circuits connected in series on the alternating current side and fed with respective independent direct current voltages. A control system forces switching of the bridge circuits to produce an alternating current on the single-phase side from different voltage levels resulting from combination of the direct current voltages from the bridge circuits. This current is fed to the collecting and distributing arrangement to compensate the harmonic frequencies generated and optionally the reactive power consumed by the traction equipment and the auxiliary equipment and retransmitted to the overhead contact wire.

REFERENCES:
patent: 3900792 (1975-08-01), Moltgen
patent: 3932799 (1976-01-01), Frank et al.
patent: 4159513 (1979-06-01), Gemp et al.
patent: 4674025 (1987-06-01), Edwards
patent: 5040105 (1991-08-01), Dhyanchand et al.
patent: 5051684 (1991-09-01), Angquist
patent: 5371664 (1994-12-01), Seki
Japanese Patent Abstract JPA 21 64201--Jun. 25, 1990.
Japanese Patent Abstrat JP 57186978 dated Nov. 17, 1982.
Japanese Patent Abstract JP60236844 dated Nov. 25, 1985.

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