CONTROL METHOD FOR FUEL CELL SYSTEM

To provide a control method for a fuel cell system capable of suppressing deterioration of a catalyst.SOLUTION: A control method for a fuel cell system according to the present invention includes the steps of obtaining the poisoning rate of an electrode catalyst of a fuel cell, performing a potential maintenance operation for maintaining the potential of the fuel cell within a first potential range when the poisoning rate of the electrode catalyst exceeds a specified value α, and performing a potential fluctuation operation that repeats a cycle in which the potential of the fuel cell is varied between an upper limit potential and the lower limit potential of a second potential range higher than the first potential range after the potential maintenance operation.SELECTED DRAWING: Figure 2 【課題】触媒の劣化を抑制できる燃料電池システムの制御方法を提供することにある。【解決手段】本発明の燃料電池システムの制御方法は、燃料電池システムの制御方法であって、燃料電池セルの電極触媒の被毒率を取得する工程と、上記電極触媒の被毒率が規定値αを超える場合において、上記燃料電池セルの電位を第１電位範囲内に維持する電位維持運転を行う工程と、上記電位維持運転後に、上記燃料電池セルの電位を上記第１電位範囲より電位が高い第２電位範囲の上限電位及び下限電位の間で変動させるサイクルを繰り返す電位変動運転を行う工程と、を備えることを特徴とする。【選択図】図２