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The stability problem of the input DC voltages in a seven-level Neutral Point Clamping (NPC) Voltage Source Inverter (VSI) is recalled and illustrated. A first solution involving six controlled-voltage (CV) rectifiers is presented. A knowledge model of this converter using switching functions and a PWM strategy is detailed. For an economic point of view, a second power structure is proposed. It consists...
A serious constraint in a multilevel inverter is the capacitor voltage-balancing. In order to stabilize these DC voltages, we propose to study the cascade constituted by a three phase three-level PWM rectifier, a clamping bridge and a nine level NPC voltage source inverter (VSI). In the first part, the authors present the topology of the nine-level NPC and they propose a model of this converter and...
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