Research on the DC Power Supply Mode Under Safe Voltage for Civil Buildings

With the increasing of DC links in civil buildings, the advantage of low-voltage DC power supply systems over traditional AC forms is more significant. However, currently, there is no unified standard for the power supply voltage and mode of low-voltage DC. To consider both electrical safety and power supply capacity, this paper first analyzes the dangerousness of different DC voltage levels in civil scenarios. Further, combined with civil building scenarios, the requirement of power supply capacity for DC voltage levels is discussed, and then a range of DC voltage levels which can simultaneously satisfy safety and power demand is proposed. Finally, based on the obtained determination principle of voltage level, a reasonable power supply scheme is constructed for typical residential building scenarios, which verifies the feasibility of DC power supply with the safe voltage in civil buildings.