DC power distribution architectures

A method performed by a power distribution system comprising a plurality of sectors and a plurality of sector isolation switches, the method comprising:

• monitoring currents across each sector of the plurality of sectors, the sector comprising:
• a sector power source;
• and
• a sector distribution bus coupled to the sector power source, the sector distribution bus being configured to convey direct current (DC) power from the sector power source to one or more loads coupled to the sector distribution bus, the sector distribution bus being coupled to adjacent sector distribution buses through respective sector isolation switches of the plurality of sector isolation switches, the sector distribution buses of the plurality of sectors being coupled together to provide a DC power distribution bus;
• wherein:
• the sector power source for each sector uniquely corresponds to the sector distribution bus to which it is coupled and is not connected to the sector distribution bus thorough the sector isolation switches;
• for each sector of the plurality of sectors, the sector distribution bus of the sector is coupled to respective first and second sector isolation switches of the sector isolation switches,
• the first sector isolation switch is coupled to a first other sector distribution bus of a first other sector and the second sector isolation switch is coupled to a second other sector distribution bus of a second other sector, so that opening both the first and second sector isolation switches isolates the sector distribution bus from the DC power distribution bus;
• the sector distribution bus of the sector is coupled to two adjacent sector distribution buses at two ends of the sector distribution bus through the first and second sector isolation switches for the sector distribution bus;
• and
• a number of the sector distribution buses is identical to a number of the sector isolation switches;
• determining that a fault occurs at a first sector of the plurality of sectors;
• and
• in response to determining that the faults occurs at the first sector, opening respective sector isolation switches for the first sector distribution bus to isolate the first sector distribution bus from the DC power distribution bus, so that a particular load of the loads that is coupled to the first sector distribution bus and a second sector distribution bus of a second sector of the sectors draws power from the second sector distribution bus.