| 摘要 |
A voltage source converter (30) comprises: at least two converter limbs (36), each converter limb (36) extending between first and second DC terminals (32,34) and having first and second limb portions (38,40) separated by an AC terminal (42), the first and second DC terminals (32,34) being connectable to a DC electrical network (46) and each AC terminal (42) being connectable to a AC electrical network (48), each limb portion (38,40) including at least one switching element (50); at least one chain-link converter (52), the or each chain-link converter (52) including a plurality of series-connected modules, each module including at least one switching element and at least one energy storage device, the or each switching element and the or each energy storage device of each module combining to selectively provide a voltage source, the or each chain-link converter (52) forming a branch to interconnect two of the AC terminals (42), each limb portion (38,40) of each converter limb (36) being switchable to switch the or each corresponding chain-link converter (52) into and out of circuit with that limb portion (38,40) and thereby switch the or each corresponding chain- link converter (52) into and out of circuit with the respective DC terminal (32,34), the or each chain-link converter (52) being switchable to control the configuration of an AC voltage at each corresponding AC terminal (42); and a control unit (54), wherein the control unit (54) coordinates the switching of the limb portions (38,40) and the or each chain-link converter (52) to cause transfer of real power between the AC and DC electrical networks (48,46). |
