A stand alone type fuel cells micro-source system with a voltage sag compensator

This paper proposes a single-phase stand alone type fuel cells micro-source system with a voltage sag compensator for compensating the AC output voltage variations (sag or swell) of micro-source. The proposed micro-source system is consist of a PEM (polymer electrolyte membrane) fuel cells Simulator, a full bridge DC converter, a 60 Hz PWM VSI (voltage source inverter), and a voltage sag compensator. Voltage sag compensator is similar to the configuration of hybrid series active power filter, and it is directly connected to micro-source through the injection transformer. The compensation algorithm of a sag compensator adopts a single phase p-q theory. The effectiveness of the proposed system is verified by the PSIM simulation in the steady state and transient state which the proposed system is able to simultaneously compensate the harmonic current and source voltage sag/swell.