| 摘要 |
In order to provide an apparatus (1) for transmitting an electric power between an AC voltage grid and a DC voltage grid in the high-voltage range with phase modules (2, 3, 4), which each have at least one common DC voltage connection (5, 6) and a separate AC voltage connection (7), wherein a phase module branch (8) extends between each DC voltage connection (5, 6) and each AC voltage connection (7) and has a series circuit (9) of two-pole submodules, which each have an energy store and a power semiconductor circuit which is connected in parallel with the energy store, with the result that, depending on the driving of the power semiconductor circuit at the two submodule connection terminals, either the voltage drop across the energy store or else a zero voltage can be generated, and an inverter transformer (13) which forms an inverter neutral point (18) on the secondary side and is connectable or connected on the primary side to an AC voltage grid (14) and on the secondary side to each AC voltage connection (7), in which apparatus improved protection against overloading is provided, it is proposed that at least one surge arrester (20, 21) is provided, which extends between the or one of the common DC voltage connections (5, 6) and the inverter neutral point (7) of the inverter transformer (13). |
