Control method for fuel cell system

The invention proposes a method for controlling a fuel cell system for supplying power to a system load and comprising a fuel cell stack and a cathode gas delivery line for delivering a cathode gas from a cathode gas source to the fuel cell stack, the control method comprises the following steps: S201, detecting a power request Preq of a system load every power detection interval time delta tP; s202, the power request Preq is compared with a preset minimum power request Pmin, and if Preqgt is detected, the power request Pmin is detected; if Pmin, executing the step S203; if Preq is smaller than or equal to Pmin, S204 is executed; s203, the fuel cell system is controlled to meet the power request Preq; s204, detecting the voltage V of the fuel cell stack; s205, the voltage V is compared with a preset minimum voltage Vmin and a preset maximum voltage Vmax, and if V is larger than or equal to Vmax, S206 is executed; if V is smaller than or equal to Vmin, S207 is executed, and Vmax < gt > is greater than or equal