IMPROVEMENTS IN OR RELATING TO POWER TRANSMISSION NETWORKS

In the field of high voltage direct current (HVDC) power transmission there is provided a power converter assembly () comprising a line-commutated power converter () that is configured to transfer power from a DC network () to a corresponding receiving AC network (). The power converter assembly () also includes a control unit which is operatively associated with the line-commutated power converter () and is programmed, in response to the receiving AC network () exhibiting a reduced AC voltage (V, V, V), to cause a reduction in the operating DC voltage (V) of the line-commutated power converter () by the DC network ().