| 摘要 |
A power electronic converter (30), for connecting AC and DC electrical networks (46,44) and transferring power therebetween, comprises: first and second DC terminals (32,34) for connection to a DC electrical network (44); a converter limb (36) extending between the first and second DC terminals (32,34) and having first and second limb portions (38,40) separated by an AC terminal (42) for connection to an AC electrical network (46), each limb portion (38,40) including a chain-link converter (50), each chain-link converter (50) including at least one rationalised module (52), each rationalised module (52) having first and second sets of series-connected current flow control elements (54) connected in parallel with at least one energy storage device (56), each set of current flow control elements (54) including a primary active switching element to selectively direct current through the or each energy storage device (56) and a primary passive current check element to limit current flow through the rationalised module (52) to a single direction, the current flow control elements (54) and the or each energy storage device (56) in each rationalised module (52) combining to selectively provide a voltage source to control the configuration of an AC voltage at the AC terminal (42); and a controller (60) to selectively control the switching of the current flow control elements (54) in the or each rationalised module (52) of each chain-link converter (50) to simultaneously switch both limb portions (38,40) into circuit to form a current circulation path (68) including the converter limb (36) and the DC electrical network (44). |
