CONVERTER

摘要

A power electronic converter (20), for use in high voltage direct current power transmission and reactive power compensation, comprises at least one converter limb (22a, 22b, 22c) including first and second terminals (24,26) being connectable to a DC network (30) and a third terminal (28), the or each converter limb (22a, 22b, 22c) defining first and second limb portions (34,36) connected in series between the third terminal (28) and a respective one of the first and second terminals (24,26), each limb portion (34,36) including a chain-link converter (38), each chain-link converter (38) including a plurality of modules connected in series, each module including at least one primary switching element connected to at least one energy storage device, each converter limb (22a, 22b, 22c) being controllable to selectively define a circulation path carrying an AC circulation current (54) for presentation to the DC network (30) to minimise DC ripple in a DC voltage presented to the DC network (30).