| 摘要 |
An arrangement (23) for tapping power from a DC power line (12) to an AC power line comprises power transfer modules (24A, 24B, 24C) between two DC potentials, each comprising a first branch with a string of converter cells (CA1, CA2, CB1, CB2, CC1, CC2) in parallel with a second branch comprising a capacitor (Csa, Csb, Csc) and being connected to an AC phase (22A, 22B, 22C). There is at least one control unit (26A, 26B, 26C) that controls the arrangement considering one or more of a) distributing appropriate AC and DC voltages in converter output voltages of all series connected modules, b) maintaining/setting cell capacitor voltages in specific range and allowing boost mode operation, c) performing possible balancing of the introduced capacitor and.d) employing an alternate approach of using passive filters to mitigate low order harmonics. |
