Abstract: Aiming at the space application and according to the demand of one spacecraft’s power consumption during a task, an architecture of a fuelcell and a storage battery was used to research the design and implementation of a 1kW fuelcell power system. A simulation model of the system used to verify the system’s design principle was built. Also, a prototype of a 1kW fuelcell power system was developed and some tests like the load’s step changing were done on it. The results show that when a step changes with half load, the 1kW fuelcell power system’s variation of the bus voltage is less than 5V and the settling time is less than 25μs; the system works normally and steadily in the whole running process, and it can meet the spacecraft’s space application demand.

Key words: space application, fuelcell, power system, simulation analysis, design and implementation