DC-link capacitor voltage balancing using redundant vectors for five-level neutral point clamped voltage source inverter

Multilevel inverter technology has emerged recently as a very important alternative in the area of high-power medium-voltage energy control. But the unbalance of these different input DC voltage sources constituted the major limitation for the uses of this power converter. This paper proposes the control and regulation method of input DC voltages of five-level voltage source inverter.