Method for operating and designing fuel cell system

The invention relates to a method for operating a fuel cell system having a fuel cell unit, to which a cathode gas, such as air, is supplied on a cathode input side by means of an electrically driven gas supply device (30), which is embodied as a fluid machine, a working region of the turbomachine can be depicted in a characteristic curve family having a surge boundary and a blocking boundary. In order to extend the service life of the fuel cell system, during operation of the electrically driven gas supply device (30), in a defined working region of the electrically driven gas supply device (30), an undesired pumping event per se is intentionally permitted away from the surge boundary. 本发明涉及一种用于运行具有燃料电池单元的燃料电池系统的方法，借助于用电驱动的气体供应装置(30)将如空气这样的阴极气体在阴极输入侧上供应给所述燃料电池，所述气体供应装置实施为流体机械，所述流体机械的工作区域能在特性曲线族中描绘出，所述特性曲线族具有喘振边界和阻塞边界。为了延长所述燃料电池系统的使用寿命，在所述用电驱动的气体供应装置(30)运行时在所述用电驱动的气体供应装置(30)的确定的工作区域中远离所述喘振边界地有意地允许本身不期望的泵送事件。