Fuel cell system and control method thereof

The invention relates to the technical field of fuel cell air compressor control, in particular to a fuel cell system and a control method thereof. The system comprises a fuel cell stack, an air compressor and a controller, wherein the air compressor supplies air to the fuel cell stack through an air supply pipeline; the output end of the controller is connected with the air compressor, the inputend of the controller collects corresponding signals, in the operation process of the fuel cell, when blowing is needed according to determination of liquid water quantity in a cathode flow channel, the controller controls the air compressor to enable target pressure to be smaller than a target pressure limit value, the target pressure limit value is obtained according to the current target rotating speed and a surge curve of the air compressor, surge of the air compressor caused by abnormal disturbance is avoided, the service life of the air compressor is guaranteed, and the problem that theair compressor surges due