Currently, Space Vector Modulation (SVM) schemes are employed widely in three-phase converter control. The impacts of different twodimensional SVM (2D SVM) schemes on THD, switching losses and output ripple for three-legged converters have been discussed in literatures. In this paper, the impact of various 3D SVM schemes on common mode component is investigated. Nine different 3D SVM schemes for four-legged three-phase converters were considered in this paper.

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An efficient dc/dc converter is needed as the interface between a low-voltage fuel cell source and a high-voltage bus for inverter operation. In this paper, a three-phase transformerisolated dc/dc converter utilizing phase-shift (PS) modulation is proposed. The converter must be able to boost the voltage significantly and operate at current levels above 240 A on the source side. Key features of the proposed converter include reduced transformer turns ratio by a factor of two while maintaining the same output voltage, reduced size of passive components including output filter and input dc bus capacitor using three-phase interleaving, eliminated inductor current ripple at PS angles above 120 • , and achieved soft switching over a wide load range without auxiliary circuitry. The proposed converter has been analyzed, simulated, and implemented in hardware. An efficiency of above 96% was achieved using the prototype unit. Experimental results were used to verify all designs and analyses.

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