Résumé

A novel structure for a multilevel voltage source inverter (patent pending) is presented. The scheme, which generalizes the well-known NPC five voltage levels inverter, includes a capacitive voltage divider, realized by n elementar AC filters and 2n switches for every branch. This structure presents two important advantages: an output voltage harmonic content reduction and the fact that, in every possible switch configuration, each solid state switch has to withstand a maximum voltage equal to 1 /n of that the DC link (excluding turn-off overvoltages) without requirements of dynamic voltage sharing at turn-on or turn-off (no devices In series). The scheme developed is illustrated, and digital simulation results obtained by means of general purpose EMTP program are presented and discussed.

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