| 摘要 |
An interface arrangement (100) is disclosed, which is configured to couple an alternating current, AC, power system (102) with a direct current, DC, power system (103), or vice versa. The interface arrangement (100) comprises a plurality of series-connected converter modules (104, 105, 106). Each converter module (104, 105, 106) comprises at least one multi-level converter cell (141-1,..., 141-N, 142-1,..., 142-N, 143-1,..., 143-N, 144-1,..., 144-N, 145-1,..., 145-N, 146-1,..., 146-N) configured to provide a voltage contribution to at least a portion of an AC waveform for example based on voltage of the DC power system. Each converter module (104, 105, 106) comprises at least one converter valve (151-1,..., 151-N, 152-1,..., 152-N, 153-1,..., 153-N, 154-1,..., 154-N, 155-1,..., 155-N, 156-1,..., 156-N), electrically connected to the multi-level converter cells (141-1,..., 141-N, 142-1,..., 142-N, 143-1,..., 143-N, 144-1,..., 144-N, 145-1,..., 145-N, 146-1,..., 146-N) and including at least two anti-parallel thyristors. The converter valves (151-1,..., 151-N, 152-1,..., 152-N, 153-1,..., 153-N, 154-1,..., 154-N, 155-1,..., 155-N, 156-1,..., 156-N) are switchable between conducting states with a selected current conduction direction and a non-conducting state so as to selectively control polarity of any voltage contribution provided by the at least one multi-level converter cell (141-1,..., 141-N, 142-1,..., 142-N, 143-1,..., 143-N, 144-1,..., 144-N, 145-1,..., 145-N, 146-1,..., 146-N). The converter valves (151-1,..., 151-N, 152-1,..., 152-N, 153-1,..., 153-N, 154-1,..., 154-N, 155-1,..., 155-N, 156-1,..., 156-N) can also serve as fault protection e.g. to divert overcurrents. |
