According to the requirement of fuel cell generation system, this paper presents a new single-stage and boost-voltage grid-connected inverter, as well as the signal modulation diagram in a line-cycle. In the proposed inverter, one of the bridge-legs is shared with a boost converter. The boost inductor current is designed in discontinuous conduction mode (DCM), which can effectively decrease low-frequency current ripple (LFCR) in output current of the fuel cell. The switching modes of the proposed inverter are analyzed in positive and negative half-line-cycles, respectively. The LFCR in the output current of fuel cell is analyzed, from which the design principle of boost voltage inductor is obtained. The per-unit current values of the shared switches and the loss of the whole system are derived and compared with the conventional inverter. Experimental verifications are presented to verify the theoretical analysis.
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