In the field of chain-link modules for voltage source converters, there is a need for an improved chain-link module.
Embodiments of the disclosure include a chain-link module, for connection in series with other chain-link modules to form a chain-link converter selectively operable to provide a stepped variable voltage source within a voltage source converter. The module can include a first pair of series-connected switching elements which are separated by a first connection terminal and are connected in parallel with first and second series-connected energy storage devices. The chain-link module can also include a second pair of series-connected switching elements that are separated by a second connection terminal, and which are connected in parallel with one or other of the first and second energy storage devices.