Parallel Fuel Cell Electrical Power System

A parallel fuel cell electrical power system (100) is provided. The parallel fuel cell electrical power system (100) includes a plurality of fuel cell electrical power modules (2) and a direct-current bus (DC bus) (3). Each of the fuel cell electrical power modules (2) has a fuel-cell stack (20), a current switch (21), and a reverse current protection element (22). The DC bus (3) electrically connects the output end of the plurality of fuel cell electrical power modules (2) and makes one fuel cell electrical power module (2) electrically connect to another fuel cell electrical power module (2) in parallel, such that the fuel-cell stacks (20) with a fixed power capacity are combined to effectively output a variety of voltages for a load.