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1. A power transmission network comprising a power converter having first and second DC converter terminals for connection in use to a DC network and an AC converter terminal electrically connected to a plurality of AC transmission conduits each of which is for connection in use to a respective AC network element configured to operate at a respective individual AC network voltage, the power converter including a primary converter controller programmed in use to control a transfer of power through the power converter and thereby between the DC network and the plurality of AC network elements, and the primary converter controller being further programmed in use to control each individual AC network voltage by establishing a virtual voltage representative of the plurality of AC network voltages and altering a single AC converter voltage produced by the power converter at the AC converter terminal to adjust the virtual voltage and thereby adjust each individual AC network voltage, wherein a secondary converter controller of the power transmission network receives in use a virtual voltage command from a higher-level controller and modifies the virtual voltage reference it establishes by determining an adjustment factor and applying the adjustment factor to the received virtual voltage command.
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