Electrical assembly

An electrical assembly comprising:

• a converter including a DC side and an AC side, the DC side configured for connection to a DC network, the AC side configured for connection to an AC network, the converter including at least one switching element;
• a circuit interruption device operably connected to the AC side of the converter;
• a DC voltage modification device operably connected to the DC side of the converter, the DC voltage modification device including a DC chopper;
• and
• a controller configured to selectively control the or each switching element, the circuit interruption device and the DC voltage modification device,
• wherein the controller is configured to be responsive to a converter internal fault by carrying out a fault operating mode in which the controller controls:
• the or each switching element to block the converter;
• the circuit interruption device to electrically isolate the converter from the AC network;
• and the DC voltage modification device to reduce or minimize a DC voltage presented by the DC network to the DC side of the converter.

A method of operating an electrical assembly, the electrical assembly comprising:

• a converter that includes a DC side and an AC side, the DC side configured for connection to a DC network, the AC side configured for connection to an AC network, the converter including at least one switching element;
• a circuit interruption device operably connected to the AC side of the converter;
• and
• a DC voltage modification device operably connected to the DC side of the converter, the DC voltage modification device including a DC chopper,
• wherein the method comprises carrying out a fault operating mode responsive to a converter internal fault by:
• controlling the or each switching element to block the converter;
• controlling the circuit interruption device to electrically isolate the converter from the AC network;
• and
• controlling the DC voltage modification device to reduce or minimize a DC voltage presented by the DC network to the DC side of the converter.