Electrical assembly with a dynamic braking system

An electrical assembly, comprising:

• a power converter having an AC side and a DC side, the AC side for connection to an AC network;
• at least one power transmission medium connected to the DC side of the power converter;
• a dynamic braking system operably connected to the or each power transmission medium, the dynamic braking system including a dynamic braking control unit programmed to selectively control activation of the dynamic braking system to carry out a dynamic braking operation;
• a monitoring unit for monitoring an electrical parameter of the AC network;
• and
• a processing unit programmed to determine an operating state of the AC network from the monitored electrical parameter, wherein the dynamic braking control unit is programmed to be responsive to the determined operating state of the AC network such that:
• (i) if the determined operating state of the AC network is a faulty operating state, the dynamic braking system is configured to be activable by a first activation trigger;
• and
• (ii) if the determined operating state of the AC network is a healthy operating state, the dynamic braking system is configured to be activable by a second activation trigger;
• wherein the processing unit is programmed to determine the operating state of the AC network as:
• (i) the faulty operating state when the monitored electrical parameter is not at a reference electrical parameter value or is not within a reference electrical parameter range;
• and
• (ii) the healthy operating state when the monitored electrical parameter is at the reference electrical parameter value or is within the reference electrical parameter range;
• wherein the first activation trigger corresponds to a DC voltage of the or each power transmission medium exceeding a first reference DC voltage threshold;
• wherein the dynamic braking control unit is programmed to configure the first reference DC voltage threshold as a function of an AC voltage of the AC network;
• wherein the dynamic braking control unit is programmed to:
• (i) reduce the first reference DC voltage threshold when the AC voltage of the AC network is not at a reference AC voltage value or is not within a reference AC voltage range;
• and
• (ii) maintain the first reference DC voltage threshold when the AC voltage of the AC network is at the reference AC voltage value or is within the reference AC voltage range;
• and
• wherein the dynamic braking control unit is programmed to reduce the first reference DC voltage threshold by an amount proportional to a difference between the AC voltage of the AC network and the reference AC voltage value or the reference AC voltage range when the AC voltage of the AC network is not at the reference AC voltage value or is not within the reference AC voltage range.