Abstract: A novel distributed power system（DPS） with modular three-port converters（TPC） and its power control were proposed for spacecraft applications in this paper. The DPS was composed of several TPC modules, interfacing the distributed energy sources, a common energy storage element（ESE） and a regulated voltage bus, with the bidirectional and output ports of the TPCs connected in parallel, respectively. Considering that the input sources are distributed and there are three power paths in each TPC, it is difficult to determine the power transferred on each path of the DPS. To achieve accurate power distribution of the multiple paths, a system level hybrid power control was proposed: current-sharing control when the ESE discharges and proportional power control based on the ability of sources when the ESE charges. With the proposed control, the DPS can work steadily under different states and achieve smooth transitions between them. The experimental results demonstrate the feasibility and effectiveness of the proposed system structure and power management strategy.