Active filter for single-phase overhead contact wire energized locomotive
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United States of America Patent
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May 28, 1996
Grant Date -
N/A
app pub date -
Aug 23, 1993
filing date -
Aug 25, 1992
priority date (Note) -
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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.
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