Abstract: As variable frequency staring power source for pump condition of generator/motor unit, the static frequency converter mainly used to drive the unit into motor condition with rated turning speed, so that the unit can be connected with power grid. The basic work principle, main devices and function of the static frequency converter were introduced, the problems occurred in application of the static frequency converter in pumped storage power station and the treatment methods were analyzed and summarized. 

Key words: static frequency converter, bridge rectifier, bridge inverter, programmable digital controller, pumped storage power station