Fuel cell system and control method of the same

A control method of a fuel cell system comprising a fuel cell stack;

• a compressor configured to supply a cathode gas to the fuel cell stack through a cathode gas flow path;
• a pressure regulation valve configured to regulate a pressure of the cathode gas flow path;
• a flowmeter configured to measure a flow rate of the cathode gas that is to be supplied to the fuel cell stack;
• and a pressure sensor configured to measure the pressure of the cathode gas flow path,
• the control method comprising the steps of:
• (i) calculating a torque target value of the compressor and an opening position target value of the pressure regulation valve from a flow rate target value of the cathode gas and a pressure target value of the cathode gas flow path, the flow rate target value of the cathode gas and the pressure target value being determined according to a required power output of the fuel cell stack;
• (ii) calculating a torque feedback value of the compressor from a difference between a flow rate measurement value and the flow rate target value of the cathode gas, and controlling the compressor using a torque command value obtained by adding the torque target value and the torque feedback value;
• and
• (iii) calculating an opening position feedback value of the pressure regulation valve from a difference between a pressure measurement value and the pressure target value of the cathode gas flow path, and controlling an opening position of the pressure regulation valve using an opening position command value obtained by adding the opening position target value of the pressure regulation valve and a delayed opening position feedback value that is obtained by delaying the opening position feedback value.