Abstract: Low-voltage DC（LVDC） distribution network directly faces power users, and its short-circuit fault seriously affects the reliability of power supply. The power electronic transformer has the ability of active current-limiting, which can improve the fault operation performance of LVDC distribution network. Aiming at the short-circuit fault of LVDC distribution network, an active current-limiting control method for power electronic transformers is proposed. Combined with the interface characteristics of various LVDC converters, the directional characteristics of current fault components are analyzed. Based on this, the protection scheme of LVDC distribution network is constructed. The scheme can be applied to different power grid structures without the help of communication system and additional boundary elements. Simulation tests verify the correctness and effectiveness of the active current-limiting control method and protection scheme.