Power net system for fuel cells and method for controlling the same

A fuel cell power net system comprising:

• a fuel cell controller configured to control current output from a fuel cell unit;
• at least one DC/DC converter configured to boost DC voltage input thereto and to output the boosted DC voltage;
• a battery connected to the fuel cell unit in parallel so as to supply DC power to the fuel cell unit;
• a load controller configured to provide demand output information required by a load of an application;
• and
• a fuel cell power controller configured to receive the demand output information from the load controller, to calculate output levels required by the fuel cell unit and the battery, respectively, to compare a current output level of the fuel cell unit with the output level required by the fuel cell unit, and to provide a control value to the fuel cell controller depending on a result of the comparison,
• wherein, when the current output level of the fuel cell unit is less than the output level required by the fuel cell unit, the fuel cell power controller sets a voltage dropped from a voltage at a front end of the at least one DC/DC converter to a target voltage so that the fuel cell unit uses a high current.