Predictive Control of an asymmetric Cascaded Multilevel Inverter with a single DC Source

Abstract

This paper proposes a control scheme for an asymmetric cascaded multilevel inverter with a single DC source. This control approach permits a unique DC source generate three-phase current with one main cell and one floating cell per phase. Main cell are handled by using a space vector control and floating cells are controlled by a predictive control strategy. This strategy is used to control the floating capacitors voltages to maintain an asymmetry to maximize the number of levels of the load voltage and also manage the reactive power to reduce the harmonics produced by the main cell, which also provides the active power to the load. Finally, the proposed control algorithm improves the load current quality with a reduce number of calculation. Results are presented in simulations.