METHOD FOR DIAGNOSING DETERIORATION OF FUEL CELL AND METHOD AND SYSTEM FOR PREVENTING DETERIORATION OF FUEL CELL USING THE SAME

A fuel cell deterioration prevention system includes a cell voltage stability determination unit determining cell voltage stability according to a preset operating condition, a fuel cell deterioration diagnosing unit diagnosing deterioration of a fuel cell by changing and controlling a control variable pre-selected according to an operating condition and monitoring a resultant change in the cell voltage of the fuel cell, and a deterioration avoidance operation control unit performing a deterioration avoidance operation based on a diagnosis result of the fuel cell deterioration diagnosing unit.