Array of electrical generator units

An electrical generator unit array for producing an array DC electrical output, the array comprising a plurality of generator units, each generator unit including an electrical generator configured to generate an AC output, and at least one AC to DC converter coupled to said generator and configured to produce a DC electrical output at an output of said generator unit, wherein the respective output of said generator units are connected in parallel to provide the array DC electrical output, and wherein the array is connectable to a receiving station by at least two output power transmission cables, each transmission cable being connected to a respective one of the generator units being array output units, whereby said array DC electrical output is transmittable to the receiving station by any one or each of the array output units, and wherein each array output unit is connected to at least one other of the generator units in order to receive the DC output from the respective connected generator unit, and each generator unit that is not an array output unit is connected to one or more array output unit and/or to one or more other non-array output generator unit so that its DC output is transmittable to any one or each of the units to which it is connected and so that the DC output of each generator unit is transmittable to said at least two output transmission cables, the respective connections between the respective units being made by a respective inter-unit power transmission cable, and wherein each generator unit preferably includes at least two switching devices that, in a non fault operating mode, connect the generator unit to a respective one of the respective transmission cables, said array further including fault detection means for detecting a fault at least in the inter-unit transmission cables, and wherein, in response to detection of a fault in any one of said inter-unit cables, said fault detection means is configured to cause the respective switch devices at each end of the faulty cable to open to disconnect the respective generator units from the faulty cable.