Patent ID: 8861234
Filing Date: 2014-10-14
Classification: H02M

Abstract:
1. A DC voltage source converter for use in high voltage DC power transmission comprising at least one chain-link converter connected between first and second DC terminals, the or each chain-link converter including a chain of modules connected in series and each module including at least one pair of semiconductor switches connected in parallel with an energy storage device, wherein the or each chain-link converter is operable when DC networks are connected to the first and second DC terminals to control switching of the modules to selectively charge or discharge the energy storage device of one or more of the modules, as required, to offset any difference in the DC voltage levels of the DC networks and wherein further including a switching assembly to toggle between electrical charging and discharging of the or each module of the or each chain-link converter, the or each chain-link converter being connected in parallel with the first DC terminal and with a series arrangement of the second DC terminal and the switching assembly or a series arrangement of the or each chain-link converter and the second DC terminal is connected in parallel with the first DC terminal and is connected in parallel with the switching assembly.