| 摘要 |
The invention relates to an active filter for filtering the current, and possibly improving the power factor, of a traction unit supplied by a single-phase catenary by means for collecting the voltage supplied by the catenary and distributors for distributing the working voltages to the traction equipment and to the auxiliary equipment (6, 7), characterised in that it comprises a number, greater than or equal to 2, of bridges (10, 11) with forced switching and with a voltage source, the bridges being connected in series on the a.c. side and being supplied with d.c. voltages independently, the active filter (8) also including a control system which forces the switching of the bridges so as to develop, on the single-phase side, an alternating current from various voltage levels resulting from the combination of the d.c. voltage values of the said bridges, this developed current being delivered to the said collector and distributor means in order to compensate for the harmonics generated, and optionally the reactive power consumed, by the traction equipment and the auxiliary equipment, and retransmitted to the catenary. <IMAGE> |
