Hydrogen supply system for fuel cell and method for controlling the same

A method for controlling a hydrogen supply system for a fuel cell, the system including a plurality of hydrogen tanks, and the method comprising:

• a hydrogen filling step in which high pressure hydrogen is supplied to a high pressure line connecting first to Nth hydrogen tanks to be filled in the first to Nth hydrogen tanks;
• a hydrogen supply step in which only hydrogen in the first hydrogen tank provided adjacent to a fuel cell stack is supplied to the fuel cell stack during driving of a vehicle;
• and
• a hydrogen transfer step in which hydrogen is transferred from the second to Nth hydrogen tanks to the first hydrogen tank during parking or stopping of the vehicle, wherein a solenoid valve of an in-tank regulator mounted at the inlet portion of the first hydrogen tank is controlled to be closed and a second solenoid valve mounted at the inlet portion of each of the second to Nth hydrogen tanks is controlled to be opened when the hydrogen in the second to Nth hydrogen tanks needs to be transferred and filled in the first hydrogen tank, and when the pressure of the first to Nth hydrogen tanks is reduced to a minimum operating pressure, the solenoid valve of the in-tank regulator of the first hydrogen tank and the solenoid valves of the second to Nth hydrogen tanks are all controlled to be opened so that residual hydrogen in the respective hydrogen tanks is used.