Single-phase three-wire fuel-cell generation system for micro-grid

This paper proposes a single-phase three-wire fuel-cell generation system for micro-grid. This generation system consists of two power converter stages: an isolated current-fed DC-DC converter and a three-port power converter. The three-port power converter has three input/output ports: a high-voltage DC port, a low-voltage DC port and an AC port. The fuel cell outputs a constant power regardless of whether the utility is nominal or fails. When the utility is nominal, the single-phase three-wire fuel-cell generation system charges the battery set, outputs an AC power and acts as an active power filter (APF). The single-phase three-wire fuel-cell generation system acts as an uninterruptible power supply (UPS) when the utility fails. Computer simulation is performed to verify the performance of the proposed system. The simulation results show that the proposed single-phase, three-wire fuel-cell generation system performs as expected.