| 摘要 |
The invention concerns a voltage source converter (10) comprising a number of valves (V1, V2, V3, V4, V5, V6), the valves comprising switching elements with anti-parallel diodes provided in a bridge for switching between two states, where the bridge is provided in at least one phase leg that stretches between two direct current poles (P1, P2) and has at least one midpoint, which is connected to an alternating current terminal (TA, TB, TC), wherein the switching element of at least one valve is a thyristor, and the converter further comprises a commutation cell (CCA, CCB, CCC) associated with the valve, where the commutation cell is controllable to reverse-bias the valve if it is to stop conducting current. |
