The invention relates to the technical field of power
supply and distribution, in particular to a DC power
supply and distribution structure. The structure comprises a control terminal, a DC cabinet,a bipolar
DC bus and DC electric appliances, and the bipolar
DC bus comprises a DC positive line, a DC
neutral line and a DC negative line. The DC electric appliances are connected between the DC positive line and the DC
neutral line, between the DC negative line and the DC
neutral line and between the DC positive line and the DC negative line, wherein the DC positive line, the DC negative line and the DC neutral line are connected to the DC cabinet, and the control terminal is in
signal connection with the DC cabinet. A two-pole three-wire
system DC bus is adopted in the invention, and loadsare symmetrically arranged, so the
voltage drop of the DC neutral line can reach zero at the minimum, the transmission distance is equivalent to that of a single-pole
voltage-doubling two-wire
system,and the
engineering adaptability is extremely high, that is, the
power supply voltage of an electric appliance is low, and
electricity utilization is
safer; the positive and negative poles of the DCelectric appliances are arranged in a staggered mode, thereby achieving the double-
bus mutual
backup, and avoiding the serious consequence that an existing single-
bus scheme has a single-
bus fault, and consequently all-road-section lamp turning-off is likely to happen.