Hybrid parallel active power filter for electrified railway system
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United States of America Patent
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Issued Date -
Apr 21, 2005
app pub date -
Sep 27, 2004
filing date -
Sep 25, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An exemplary parallel hybrid power filter apparatus for the electrified railway is described. The apparatus may include a group of LC reactive filter being purely tuned, an additional inductance, an active power filter and a coupling transformer. The active power filter may be controlled, e.g., as a current source in a composite control manner and can be connected in parallel to the additional inductance via the coupling transformer. The power filter can be connected to the reactive filter in series to form the parallel hybrid filtering system, and may be connected to the power grid via the circuit breaker or a thyristor. This exemplary system can be installed either in the traction substations or in the locomotives directly, or performed by ameliorating the original reactive filter. The active power filter does not add significant amount of cost, and may be simple and reliable in a control manner for the capacity of the APF is so small as to be less than one percent of that of the harmonics source. The power filter can also inhibit the impact of the 'background harmonics' of the electrified railway on the reactive filter, and prevent the reactive filter and the grid impedance from resonance.
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