主权项 |
1. A power electronic converter, for connecting AC and DC networks and transferring power therebetween, comprising:
first and second DC terminals (32, 34) for connection in use to a DC network (48); at least one primary converter limb (36a, 36b) extending between the first and second DC terminals (32, 34) and having first and second primary limb portions (40a, 40b) separated by a primary AC terminal (42) for connection in use to a respective phase of a multi-phase AC network (50), at least one of the first and second primary limb portions (40a, 40b) including at least one primary active switching module (54) to selectively allow current to flow through the corresponding primary converter limb (36a, 36b) in a first direction from the corresponding primary AC terminal (42) to the DC terminals (32, 34) and in a second direction from the DC terminals (32, 34) to the corresponding primary AC terminal (42); and at least one secondary converter limb (38) extending between the first and second DC terminals (32, 34) and having first and second secondary limb portions (44a, 44b) separated by a secondary AC terminal (46) for connection in use to a further respective phase of the said multi-phase AC network (50), each of the first and second secondary limb portions including at least one passive current check element (58) to limit current flow through the corresponding secondary converter limb (38) to a single direction from the corresponding secondary AC terminal (46) to the DC terminals (32, 34). |